(1)Trans.. 206.. FOSSIL. Proc.. Palaeont.. DIATOMS. ON THE. Soc. Japan. N. S., No. 4, pp. 97-111. FOUND. IN THE. OUTSKIRTS WATARU. Nov.. KAYAMA. OF KANAZAWA. 1951.. CLAY-SHALE CITY1). ICHIKAWA. Kanazawa University, Kanazawa , Japan.. 金 沢 市郊外 茅 山 の砧土 質 頁 岩 中か ら発 見 され た化 石珪 藻65種 を詑 載し ,こ れ ら化 石 を 含 む堆 積 物 は,礫層 を主 とす る卯 辰山層 の一 部 で あり,し か も化 石 珪 藻 の大 部 分 が淡 水中 か ら知 られ て い る も ので あ るか ら,卯 辰 山層 の一部 は,淡 水 堆積 物 で あ る. 卯 辰 山層 の時 代 は 鮮新世 か,そ れ と も更新世 か,そ の帰 属 は まだ明か に され て い な いが ,こ こで は 下 位 に あ る と考 へ られ る海成 の大 桑 砂 層 とは 全 く別 な もので あ る.市 川 渡.. INTRODUCTION. left as it stands. or four hours . After having been sufficiently washed by distilled water, the material must be taken out from that test-tube, and it is dried in the constant temperature furnace until it becomes white powder. Its dried. In the present article, the writer has attempted to give close attention to details concerning the assemblage of the fossil diatoms in the Kayama clay-shale. The Kayama clay-shale is one facies of what was callel by Prof. K. MOCHIUKI the Utatsuyama bed. Its geological Z age has not yet exactly been determined. But it is a certain fact that the bed belongs to the early Pleistocene or the late Pliocene. The exposure of this clay-shale is limited to a small cliff which is about 6 m in height and 5 m in width. (See TextFig.) The sample used for my experiment had been selected from the central portion of that cliff. Its colour is grayish white. As the sample is comparatively homogeneous, the method of its chemical treatment is simple as follows:First, some of the material is loosened in one test-tube by some distilled water. After that, concentric sulphuric acid twice or thrice as much as the used material is poured into it, and the test-tube is. for. three. powder is useful for test of fossil diatoms.. the. microscopical. The writer wish to record here my indebtedness to Proc. Dr. I. HAYASAKA of out University and Prof. Dr. KOBAYASHI of the Tokyo University who so kindly made helpful suggestions in connection with the present study.. Some. geo-ecological. Problems. Utatsuyama The. Utatsuyama. bed. of the. Bed is composed. of. gravel, sand, mud and clay-shale. It lies unconformably on the Onma bed of the Onma series which belongs to the Pliocene age. The area in the surrounding of Kanazawa City where the Utatsuyama bed is now exposed, is comparatively wide.. 1) Read March, 24, 1951; received June 18, 1951 97.
(2) Wataru. 98. Text-Figure. The. Kayama. ICHIKAWA. clay-shale. Little is known, however, of the sediments and microfossils of the clay-shales found in the Utatsuyama bed, and it is the chief aim of this study to elucidate these aspects. The Onma bed is composed of sand, mud, tuff and shale etc. The geological relation betweea the Utatsuyama and the Onma bed has been pointed out by a few geologists. According to their data, the latter is of marine origin in view of its fossil remains. The former, however, remains unexplained. The upper part of the Utatsuyama bed is characterized by gravels. But it also contains sand, mud and clay-shale here and there. The fact means that the geological structure of the bed is complicated. The mudstone of the Onma bed con-. exposed. by weathering.. tains many fossil diatoms which were carried by a sea-current, or deposited with other livings near the coast. For example, the Mitsukoji mudstone of the Onma bed found at the eastern outskirt of Kanazawa City contains many marine diatoms together with sponge spicules, Radiolaria and Silicofiagellata. Although the exposure of the Kayama clay-shale is limited to a small area, it contains many fossil diatoms deposited with other Algae and Fishes. Most of them belong to the fresh-water forms. The sediment, therefore, is of fresh-water origin. The Kayama clay-shale is unconformably covered by sand, and this sand again by gravel in the same way. Each boundary of these layers is complicated. Such clay-shale, mud and sand have been.
(3) Fossil. found. at. a. Diatoms. found. few. places. in the Kayama. in the. Clay-Shale. on the. exposed. Fossil. part of the Utatsuyama bed. The Kayama clay-shale is only one instance of them. The most of the fossil diatoms which the writer found in the Kayama clayshale belong to the recent fresh-water forms. From this fact, it is concluded that the Kayama clay-shale was the sediment of a pond or a swamp or a small lake in the past. From this reason, it may be stated that some part of the Utatsuyama bed is of the freshwater deposit.. Outskirts. Diatoms. 99. Kayama. A list of diatoms showing the relative frequency of each species in the assemblage, provides a basis for determining such ecological conditions during deposition as fresh water, lacustrine, brackish estuary, shallow water marine, open sea, etc. According to my microscopical examination, it is found that the sample collected from the Kayama clay-shale, contains the following sixty-five species of. TABLE. of Diatoms. in the. City. Clay-shale. diatoms:—. List. of Kanazawa. I. and their. Habitats..
(4) 100. Wataru. ICHIKAWA.
(5) Fossil. Diatoms. found. in the. Kayama. Clay-Shale. on the Outskirts. of Kanazawa. TABLE II Recent. Species. found. in Japanese. Lakes. and. Ponds.. TABLE III Ecological. Character. of Species. (Kolbe's. Method). City. 101.
(6) 102. Wataru. Description Family. Tribe. SMITH (1856): Brit. 1. III, fig. 337.. a. Melosirinac. Melosira granulata. AG., 1821. (EHR.). W. SM.. RALFS.. Text-fig. 33, a, b.. OKUNO(1943): Japan. Diat. Dept., Bol. Mag. Tokyo, Vol. 57, No. 683-4, p. 366, Pl. I. fig. e. Valve long and narrow. Striae distinctly striate and punctate (a); Striae somewhat spiral and punctate, one extremity broadened in comparison with the other (b). Found in the diatomite of Yatsuka (Okayama), Kanou and Kawabe (Nagano), Hirazawa (Miyagi), Nakaterao (Yamanashi), and in the mudstone of Mitsuwa (Nagano).. Diat., Vol. II, p. 61, Pl.. Valve punctate; line of junction with somewhat distinct and subdistant denticulations. This species has arisen much confusion in the synonymy, hence here referred to the above-mentioned name. According to RAUENHORST,it is identical with Melosira oricltalcea (MERTENS) KTZ.. I. Discoideae. 1. Coscinodisceae. Sub-tribe. orichalcea. Text-fig. 43, a. b.. A. Centricae. Sub-family. Melosira. Orthosira. of Species. DIATOMACEAE. Section. Genus. ICHIKAWA. Sub-tribe. d. Ccscinodiscinae. Genus Coscinodiscus EHR., Coscinodiscus. eccenlricus. 1838. EHR.. Text-fig. 11. •. SMITH (1853): Brit. Dial., Vol. I, p. 23, Pl. III, fig. 38. Valve circular, spots arranged eccentric lines. Found in the clay Kahoku lagoon (Ishikawa).. in of.
(7) Diatoms. Fossil. found. in the. Outskirts of Kanazawa Genus City 103 Slephanodiscus Stephanodiscus. Kayama. Clay-Shale. EHR., 1845.. aegyptiacus. EHR.. Text-fig. 59, a. b, c. EHRENBERG(1854): Mikrogeol., T. XXXIV, fig. 16, a. Frustule undulate with margin. Valve circular radiating rows of spots, distinct as striae near the Stephanodiscus. spines on the covered with but rows are margin.. Brantaputrac. EHR.. Text-fig. 69. EHRENBERG(1854): IX, fig. 9.. Mikrogeol., T. XXXVA,. Valve plane or somewhat curved, rows of spots delicately radiate from the center, many large spots found at interval near the marginal part.. Tribe. V. Fragilarioideae. a. Fragilariinae. Genus Fragilaria Fragilaria. LYNGB., 1819.. diophthalma. Genus Synedra. EHR.. Text-fig. 25. EHRENBERG(1854): Mikrogeol., T. XII, fig. 2, a-h. Valve linear, cuneate at the extremities. It is identical cupucina DESMAZ.. subacute with F.. EHR., 1830.. Synedra rumpens KTZ. var. fragilarioides GRUN. Text-fig. 61. OKUNO (1940): Dial. Japan., I; Jour. Sci. Hiroshima, Ser. B, Div. 2, Vol. 4, p. 43, fig. 9. Valve narrow, lanceolate, both extremities round, in the middle part, somewhat broadened. Striae parallel, pseudoraphe linear. Found in the diatomite of Hirazawa (Miyagi), and in the mudstone of Nakamura Irizawa (Yamanashi). ulna EHR.. Text-fig. 62, a, b. SMITH (1853): XI, fig. 90.. 10. Fragilalieae. Sub-tribe. rostrate and middle part inflated. Striae slightly radiate. Found in the muddy substrata at Genbu-do (Hyogo).. Synedra. Section B. Pennatae Sub-family. on the. Brit. Dial., Vol. I, p. 71, Pl.. Valve lanceolate-acute, with parallel margins and rostrate extremities. Found in the diatomite of Ooike (Nagano), and in the mudstone of Mitsuwa (Nagano), Nakamura-Irizawa (Yamanashi). Sub-tribe. b. Diaio minae. Genus Odontidium Odentidium. KG., 1844.. mutabile. W. SM.. Text-fig. 42. Fragilaria. inflata. (HEIDEN.) HUST.. Text. fig. 26. OKUNO (1940): Dint. Japan., I, Jour. Sci. Hiroshima, Ser. B, Div. 2, Vol. 4, p. 40 4. fig. Valve. lanceolate,. both. extremities. SMITH (1356): Brit. Dial., Vol. II, p. 17, Pl. XXIV, fig. 290. Valve oval, elliptical or linear-acuminate; costae marginal distinct . Exceedingly variable in size and outline of valve. This species is identical with Fragilaria mutabilis (W. SM.) GRUN..
(8) 104. Wataru. Found in the diatomite of Kanou and Kawabe (Nagana), Ureshino (Saga), and in the mudstone of NakamuraIrizawa (Yamanashi), Mitsuwa (Nagano). Sub-family Tribe. VI. Heteroideae. 12. Achnanlheae. Sub-tribe. a. Achnanthinae. Genus Achnanthes. BORY, 1822.. Achnanthes. KRAS.. aueri. Text-fig. 1, a, b. KRASSKE(1949): Diat. Palagoniens und Feuerlands., Ser. A, IV. 14, p. 79, fig. 3. Valve lanceolate, with rostrate extremities, inflated in the middle part. Upper valve with narrow lanceolate pseudoraphe. Central part with horse shoeshaped hyaline space. Lower valve with narrow axial area. Striae slightly radiate.. ICHIKAWA. Achnanthes. lanceolata. (BREB.) GRUN.. Text-fig. 4. OKUNO (1940): Dial. Japan., I, Jour. Sci. Hiroshima, Ser. B, Div. 2, Vol. 4, p. 53, fig. 21. Valve elliptic-lanceolate, with broad rounded extremities. Upper valve with narrow pseudoraphe, and on one side a horse shoe-shaped hyaline space. Lower valve with narrow axial area. Striae slightly radiate. Found in the muddy substrata at Genbu-do (Hyogo). Genus Rhoicosphenia Rhoicosphenia. curvata. GRUN., 1860. (KTZ.) GRUN.. Text-fig. 54. MUROBUSE(1936): Diat. Ashi, Suisankenkyushi, Vol. 31, p. 3, Pl. I, fig. 14. Front of valve elliptical, toward epitica.. and it curves. Genus Cocconeis EHR., 1835. Achnanthes. brevipes AG.. Text-fig. 2, a, b. SMITH (1856): Brit. Dial., Vol. II, pp. 27-28, Pl. XXXVII, fig. 301. Valve linear-oval, with a slight central constriction. Spotted striae parallel. Achnanthes Hauckiana densistriata. GRUN. var.. HOR. et. OKU.. Text-fig. 3. OKUNO (1940): Diat. Japan., I, Jour. Sci. Hiroshima, Scr. B, Div. 2, Vol. 4, p. 52, fig. 20. Valve elliptic-lanceolate, with slightly rostrate extremities. Striae somewhat radiate. Found in the muddy substratum at Genbu-do (Hyogo).. Cocconeis placentula klinoraphis. EHR. var. GEIT.. Text-fig. 8. KOBAYASHI (1930): Dial. Destn. Ueno.,Japan. Jour. Limn., Vol. 14, No. 4, p. 195, Pl. I, fig. 8. Valve elliptical, striae delicately ated. Found in the Paddy-fields at City (Mie).. radiUeno. Cocconeis placentula EHR. var. lineatus (EHR.) CL. Text-fig. 9, a, b. OKUNO (1940): Dial. Japan., I, Jour. Sci. Hiroshima, Ser. B, Div. 2, Vol. 4, p 55. fig. 25. Upper valve with narrow. pseudoraphe..
(9) Fossil. Diatoms. found. in the. Kayama. Clay-Shale. Central area absent (a). Lower valve with raphe (b). Striae very fine, irregularily pointed. Found in the diatomite of Tochibori (Nigata), Ureshino (Saga), Hirazawa (Miyagi), Kanou and Ooike (Nagano), and in the mudstone of NakamuraIrizawa (Yamanashi), Kawabe (Nagano). Sub-family. VII. Navicrdoideae. Tribe 13. Naviculeae Sub-tribe. a. Naviculinae. Genus Navicula. BORY, 1822.. (Pinnularia EHR., 1840; Caloneis CL., 1891; Neidium PEITZ., 1871.) Navicula corlanensis. KRAS.. on the. Outskirts. of Kanazawa. 105. City. cal with Diploneis elliptica after CLEAVE. Found in the diatomite of Hirazawa (Miyagi), Kawabe (Nagano), and in the mudstone of Mitsuwa (Nagano) Nakaterao (Yamanashi). Navicula. placentula. (EHR.) GRUM.. Text-fig. 36, 38. SKVORTZOV(1937): Neo. Dial. Wamura., Coll. Sri. Kyoto, Vol. XII, p. 146,Pl. VI, fig. 11. Valve elliptical-lanceolate with subrostrate extremities. Striae radiate. Central area somewhat orbicular. Found in the mudstone of Kahoku Lagoon (Ishikawa). Navicula. subrotundata. HUST.. Text-fig. 34.. Text fig. 39.. KRASSKE(1949): Diat. Trop. Moosrasen. BD. 42, H. 4, pp. 443, T. II, fig. 3.. KRASSKE(1949): Diat. Patagoniens urd Feuerlards. Ser. A, IV. 14, p. 91, fig. 16, 17.. Valve linear lanceolate with three strong lines on both sides from the center. Striae radial, but indistinct.. Valve elliptical, striae ate. Raphe distinct.. Navicula. didyma. KTZ.. Pinnularia. somewhat. cardinalis. radi-. EHR.. Text-fig. 35.. Text-fig. 44.. SMITH (1853): Brit. Diat., Vol. I, Pl. XVII, fig. 154.. SMITH (1853): Brit. Diat., Vol. 1, p. 55, pl. XIX, fig. 166.. Valve elliptical, deeply constricted in the center; striae interrupted, distinct. This species is found very rarely in the fresh-water deposits of Japan. The structure of frustule somewhat differs from it of marine form.. Valve linear, extremities costae radiate, absent from of valve. Found in the diatomite and Coike (Nagano). Pinnularia. Navicula. ovalis W. Sr.. Text-fig. 37. SMITH (1853): Brit. Dial., Vol. I, p. 48, Pl. XVIII, fig. 153. Valve elliptical, occasionally inflated; striae distinct. This species was named N. elliptica by KUTZING and also identi-. Gastrum. rounded; the center of. Kanou. EHR.. Text-fig. 45. EIIRENBERG (1854): fig. 12.. Mikrogeol., T. V, I,. Valve attenuate, curved at the extremities; striae distinct. Found in the diatomite of Hirazawa (Miyagi)..
(10) 106. Wataru ICHIKAWA. Pinnularia. gentilis. (DONKIN) CL.. Pinnularia. radiosa. W. SM.. Text-fig. 46.. Text-fig. 51.. OKUNO (1940): Diat. Japan, I, Jour. Sci. Hiroshima, Ser. 13,Div. 2, Vol. 4, p. 62, fig. 37.. SMITH (1853): Brit. Dial., Vol. I , p. 56, Pl. XVIII, fig. 173.. Valve linear, with rounded extremities, slightly inflated in the middle. Central are widened. Striae somewhat divergent in the middle, convergent at the extremities. Found in the mudstone of Nakaterao (Yamanashi). Pinnularia. interrupta. W. SM.. Text-fig. 48. SMITH (1653): Brit. Diat., Vol. I, p. 59, Pl. XIX, fig. 184. Valve linear, constricted at the rounded extremities, costae absent from the center of the valve. Pinnularia. microstauron. (EHR.) CL.. Text-fig. 49. SKVORTZOV(1937): Neo. Dial. Wamura., Coll. Sci. Kyoto, Vol. XII. p. 146, Pl. V, fig. 6. Valve linear with subrostate-capitate extremities. Central area a broad stauros. Found in the mudstone of Nakaterao (Yamanashi), and in the diatomite of Kanou (Nagano). Pinnularia. nobilis EHR.. Text-fig. 50. SKVORTZOV(1937): Neo. That. Wamura , Coll. Sci. Kyoto, Vol. XII, p. 148, Pl. IV, fig. 1. Valve linear, somewhat gibbous in the middle and at the broadly rounded extremities. Striae convergent at the ends. Central area widened. Found in the diatomite of Kanou (Nagano).. Valve lanceolate, obtuse; ate, contiguous. Found in the mudstone (Nagano). Pinnularia. viridis. costae. radi-. of Mitsuwa. W. SM.. Text-fig. 52. Valve elliptical, attenuated, costae somewhat radiate, distant. Found in the mudstone of Ooike (Nagano) and Nakamura-Irizawa (Yamanashi) . Caloneis silicula. (HHR.) CL.. Text-fig. 6. SKVORTZOV(1937): Neo. Diat. Wamura., Coll. Sci. Kyoto. Vol.XII, p. 142, Pl. IV, fig. 12. Valve linear-lanceolate, slightly capitate extremities. Center of the valve shows rectangular dilated area. Found in the diatomite of Kanou and Kawabe (Nagano), Ureshino (Saga). Neidium. bisulcatum (LAGERST.) CL. var. nipponica SKV. Text-fig. 66.. SKVORTZOV(1937): Neo. Dial. Wamura., Coll. Sci. Kyoto. Vol. XII, p. 143, Pl. IV, fig. 8. Valve sublinear, attenuated the round extremities. Stauroneis. construens. towards. EHR.. Text fig. 56. EHRENRERG(1854). Mihrogeol., T. V, II, fig. 23. Valve small, cross-shape; ities round.. four extrem-.
(11) F ossil. Diatoms. found. in the. Kayama. Clay-Shale. the Cutskirts of Kanazawa Slauroneis City 107 dilatala W. SM. Text•fig. 57. SMITH (1853): Brit. Dial, Vol. 1, p. 60, Pl. XIX, fig. 191. Valve elliptical, extremities somewhat produced; stauros linear, not reaching the margin.. on. SMITH (1853): Brit. Diat., Vol. I, p. 60, Pl. XVIII, fig. 237. Valve slightly attenuated towards the upper extremities, which is rounded; much attenuated towards the lower, which is somewhat acute. Found in the diatomite of Mitsuwa (Nagano).. Stauroneis. phcenicenteron. EHR.. Text-fig. 58. SMITH (1853): Brit. Dial., Vol. I, p. 59, Pl. XIX, fig. 185. Valve lanceolate, with obtuse or somewhat rostrate extremities. Found in the diatomite of Hiraznwa (Miyagi), Ooike and Mitsuwa (Nagano), and in the mudstone of Kawabe (Nagano), Nakaterao (Yamanashi) , and in the clay of Kahoku lagoon (Ishikawa). Sub-tribe. b. Gomphonenunae. AG., 1824. Gomphonema acuminalum EHR. Text-fig. 28, a, b. c. SMITH (1853): Brit. Diat, Vol. I , p. 7P, Pl. XXVIII. fig. 238. Valve constricted somewhat triangular and apiculate above, attenuated below . Found in the diatomite of Ooike and in the (Yamanashi).. Gomphonema. mudstone. augur. of. Valve clavate, one extremity narrow rounded, other somewhat broad with apiculate apex. On one side the median striae with a stigma. capilatum. Text-fig. 30.. EHR.. SMITH (1853): Brit. Dial., Vol. I, p. 79, Pl. XXVIII, fig. 240. Valve lanceolate, slightly cuneate, truncated. This species is identical with G. dichotomum KTZ. Found in the diatomite of Kawabe (Nagano). lanceolatuna. EHR. var.. insignis (GREG.) CL. Text-fig. 32. SRVORTZOV (1937): Neo. Dial. Wamura., Coll. Sci. Kyoto, Vol. XII , p. 152, Pl. IV, fig. 2. Valve lanceolate. Extremities slightly constricted. Striae robust, on one side the median stria with a stigma, other side striae short. Found in the diatomite of Kanou (Nagano).. EHR.. Text-fig. 29. OKUNIO(1942): Dial. Japan. , II. Jour. Sci. Hiroshima, Ser. 13,Div. 2 , Vol. 4, p, 38, fig. 34.. Gomphonema. gracile. Text-fig. 31.. Gomphonema. Genus Gomphonema. (Nagano), Nakaterao. Gomphonema. EHR.. Sub-tribe. c. Cymbellinae. Genus Cymbella AG., 1830. (Cocconema Cymbella. EHR., 1829) affinis KTZ.. Text-fig. 12. SMITH (1853): Brit. Dial., Vol. I , p. 18, Pl. XXX, fig. 250. Valve elliptical-lanceolate, extremities slightly produced. Striae faint ..
(12) 108. Wataru. ICHIKAWA.
(13) Fossil. Diatoms. found. in the. Cymbella gracilliam. Kayama. Clay-Shale. HUST.. Text-fig. 13.. Sub-tribe. e. Pleurosigminae. Genus Pleurosigma. KRASSKE(1913): Dial. Trop. Moosrasen. BD. 42, H. 4, p. 436, T. II, fig. 41. Valve lanceolate, extremities gradually attenuate. On one side the median striae with a stigma. Cymbella proslrata. on the Outskirts of Kanazawa City 109. (BERK.) CL.. Pleurosigma. W. SM., 1853.. rigidum. W. SM.. Text-fig. 53. SMITH (1853): Brit. Diat., Vol. I, p. 64, Pl. XX, fig. 198. Valve linear-lanceolate; flexure slight; extremities rounded; median line central.. Text-fig. 14. SKVORTZOV(1937): Neo. Dial. Saga., Coll. Sci. Kyoto. Vol. XII, p. 168, Pl. X, fig. 16. Valve asymmetrical, subelliptical with arcuate dorsal and slightly arcuate at ventral margins or lunate with curvate extremities. Found in the mudstone of NakamuraIrizawa (Yamanashi). Cocconema cymbiforme. EHR.. Text-fig. 10. SMITH (1853): Brit. Dial., Vol. I, p. 76, Pl. XXIII, fig. 220. Valve narrow, concave margin scarcely inflated. Striae somewhat radiate, extremities gradually attenuate. Found in the mudstone of Nakaterao (Yamanashi),. Mitsuwa. Genus Amphora. (Nagano). EHR., 1831.. Amphora ovalis KTZ. Text-fig. 5. (1853): II, fig. 26.. Brit. Dial.,SMITH Vol. I, p. 19, Pl.. Valve exceedingly convex. Internal margin of valve inflated at the nodule. Striae spotted. Found in the diatomite of Kanou (Nagano), Hirazawa (Miyagi), Ureshino (Saga), and in the lignite bed of Hanamaki (Iwate).. Sub-family. Surirclloideae-Carinalae. Tribe. 15. Surirelleae. Genus Surirella. TURP., 1828.. Surirella. EHR.. Librile. Text-fig. 63. EHRENBERG(1854): fig. 23.. Mikrogeol., T. XXV, VII,. Valve elliptical acute, usually with a central constriction, canaliculi delicate. Genus Campylodiscus Campylodiscus. EHR., 1840.. cribrosus. W. SM.. Text-fig. 7. Valve nearly circular; surface with the characteristic contortion. Cells irregularly circular, in radiating lines. Found in the diatomite of Yatsuka (Okayama). Tribe. 16. Epilhemieae. Genus Epithemia Epithemia. BREB., 1844.. argus W. SM.. Text-fig. 16. SMITH (1853): I, fig. 5.. Brit. Dial., Vol. I, p. 12, Pl.. Valve slightly arched, extremities gradually attenuate. Canaliculi indistinct. Found in the diatomite of Ooike (Nagano)..
(14) Wataru. 110. Epithemia Hyndmanii Text-fig. 17.. W. SM.. ICHIKAWA. (Saga), Hirazawa (Miyagi), and in the tuffaceoas mudstone of Nukatsukayama. SMITH (1853): Brit. Dial., Vol. I. p. 12, Pl. I , fig. 1. Valve much and regularly arched, extremities rounded, not recurved. Canal'culi inconspicuous. Found in the diatomite of Yatsuka. (Nagano), and in the mudstone nnlra-Irizawa (Yamanashi).. (Okayama), Hirazawa Ooike Kawabe and Kanou (Nagano), Ureshino (Saga), and in the mudstone of N:IkamuraIrizawa (Yamanashi).. OKUNO (1944): Japan. Dial. Dep., Bol. Mag., Vol. 58, No. 685, p. 11, fig. 4, d-e.. Epithemia. longicornis EHR. Text-fig. 18. SMITH (1853): Brit. Dial., Vol. I, p. 13, Pl. XXX, fig. 248. Valve somewhat angular ridge, extremities obtuse. Epilhemia Musculus Text-fig. 19.. in the dorsal. Epithetnia zebra (EHR.) KTZ. var, porcellus (KTZ.) GRUN. Text-fig. 22.. Valve slightly arched, extremities attenuate. Canaliculi indistinct. Genus Rhopalodia Rhopalodia. long. O. MULL.., 1895.. gibba (EHR.) O. MULL. Text-fig. 55.. MUROBUSE(1936): Dial. Ashi., Suisanketkyushi. Vol. 31, No. 6, p. 8, Pl. III, fig. 4. Valve linear, extremities.. inflated. at center. and. KTZ.. SMITH (1833): Brit. Diat., Vol. I, p. 14, Pl. I, fig. 10. Valve regularly and strongly arcuate, extremities acute. Canaliculi distinct. Epithemia sorex KTZ. Text-fig. 20. SMITH (1853): I, fig. 9.. of Naka-. Tribe. 17. Eunotieae. Genus Eunotia Eunotia. EHR., 1837.. praerupta. EHR.. Text-fig. 23. EHRENBERG(1851): Mikrogeol., T. II, fig. 27. Valve lunate, arcuate with extremities. I'seudorodules Striae robuste.. recurved distinct.. Brit. Dial., Vol. 1, p. 13, Pl.. Valve attenuate, slightly recurved at the extremities, dorsal line highly arcuate. Canaliculi minute, indistinct. Epithemia turgida W. SM, Text-fig. 21. SMITH (1853): Brit. Diat., Vol. 1, p. 12, Pl. , fig. 2. I Valve slightly arched, extremities suddenly attenuate, obtuse. Canaliculi distinct. Found in the diatomite of Yatsuka (Okayama), Kanou (Nagano), Ureshino. Eunotia zebrina EHR. Text-fig. 24. EHRENBERG(1854): fig. 23.. Mikrogcol., T. IV,. II,. Valve recurved at the obtuse extremities. Striaes large. This spxcies bears some reseniblance to genus Epilhenzia. Sub-family Tribe. X. Nitzschioidcae 18. Nitzschiae. Genus Nitzschia Nitzschia. HAS., 1845.. bilobata W. SM. Text-fig. 40..
(15) Fossil. Diatoms. found. in the Kayama. Clay-Shale. the OutskirtsSMITH of Kanazawa (1853):CityBrit. 111 Diat , Vol. I, p. 42, Pl. XIII, fig. 112. Frustule elliptical, with a central constrictions and round or truncate extremities Nitzschia Plana W. SM. Text-fig. 64. SMITH (1833): Brit. Diat., Vol. I, XV, fig. 114.. sigmoidea. (EHR.) W. SM.. Text-fig. 41. SMITH (1853): Brit. Diat., Vol. I, p. 38, Pl. XIII. fig. 104. Valve linear, suddenly tapering towards the acute extremities; keel with a single line of puncta. Genus Hantzschia (Denticula. The nineteen species of the fossil diatoms in the Kayama clay shale are found in Japanese lakes and ponds. Fourteen of them are, in their ecological characters, known as Oligohalob. Fifty one of the species are all known existing in freshwater. The Kayama clay-shale, therefore, belongs to fresh-water origin. The Kayama clay-shale is one facies of the Utatsuyama. bed. From this reason some part of the Utatsuyama bed is of fresh-water origin, and it differs from its bed rock of the Onma series which is of marine origin.. GRUN., 1877. KG., 1844). Hantzschia amphioxys (EHR.) GRUN. var. xerophila GRUN. Text-fig. 65. SKVORTZOV(1936): Neo. Diat. Ampen., Rep. yosen Geol. Sur. No. 12, p. 34, Pl. TIV, fig. 9. Valve linear-lanceolate with constricted ventral and convex dorsal margins. Extremity subrostrate. Denticula. brance to Surirella robusta. Some of the other remaining diatoms contain fragments of Coscinodiscus sp., Tryblionella sp. and Achnanthes sp. besides the sixty-five species above-mentioned.. SUMMARY p. 42, Pl.. Valve elliptical, slightly constricted towards the center and tapering toward the somewhat truncate extremities. Nitzschia. on. obtusa KTZ.. Text-fig. 15. SMITH (1856): Brit. Diat., Vol. II, p. 19, Pl. XXXIV, fig. 292. Valve lanceolate, or linear, and attenuate towards the extremities, which are obtuse; striae delicate and not found commonly. Many fragments of frustules are found in the Kayama clay-shale. Some of them seem to bear a remarkable resem-. References ICHIKAWA,W. (1950): The Correlation of the Diatom-bearing Mudstones in the Note Peninsula and the Vicinity of Kanazawa City. Jour. Geol. Soc. Japan. Vol. 56, No. 653, pp. 49-56. IKEBE, N. (1949): Tertiary Stratigraphy of Western Toyama and Ishikawa Prefectures. Sci. Ear. Vol. I, No. 1, pp. 2324 KOLBE,R. W. (1927): Zur Okologie, Morphologie and Systematik der Brackwasser diatomeen: Die Diatomeen des Sperenberger Salzgebietes. Pflanzenforschung, Heft 7. MOCHIZUKI, K. (1930): Topography and geological Structure of the northern End at Kaga-Mino Mts. Jour. Geol. Soc. Japan. Vol. 7. No. 445, p. 492. ONOYAMA,T. (1933): The Tertiary in the Neighbourhood of Kanazawa City, and Isurugi, Toyama (2 parts), Pts. 1-2. Clzikyu, Vol. 79, No. 3, pp. 173-195; No 4, pp. 245-286..
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(2) Wataru. 98. Text-Figure. The. Kayama. ICHIKAWA. clay-shale. Little is known, however, of the sediments and microfossils of the clay-shales found in the Utatsuyama bed, and it is the chief aim of this study to elucidate these aspects. The Onma bed is composed of sand, mud, tuff and shale etc. The geological relation betweea the Utatsuyama and the Onma bed has been pointed out by a few geologists. According to their data, the latter is of marine origin in view of its fossil remains. The former, however, remains unexplained. The upper part of the Utatsuyama bed is characterized by gravels. But it also contains sand, mud and clay-shale here and there. The fact means that the geological structure of the bed is complicated. The mudstone of the Onma bed con-. exposed. by weathering.. tains many fossil diatoms which were carried by a sea-current, or deposited with other livings near the coast. For example, the Mitsukoji mudstone of the Onma bed found at the eastern outskirt of Kanazawa City contains many marine diatoms together with sponge spicules, Radiolaria and Silicofiagellata. Although the exposure of the Kayama clay-shale is limited to a small area, it contains many fossil diatoms deposited with other Algae and Fishes. Most of them belong to the fresh-water forms. The sediment, therefore, is of fresh-water origin. The Kayama clay-shale is unconformably covered by sand, and this sand again by gravel in the same way. Each boundary of these layers is complicated. Such clay-shale, mud and sand have been.
(3) Fossil. found. at. a. Diatoms. found. few. places. in the Kayama. in the. Clay-Shale. on the. exposed. Fossil. part of the Utatsuyama bed. The Kayama clay-shale is only one instance of them. The most of the fossil diatoms which the writer found in the Kayama clayshale belong to the recent fresh-water forms. From this fact, it is concluded that the Kayama clay-shale was the sediment of a pond or a swamp or a small lake in the past. From this reason, it may be stated that some part of the Utatsuyama bed is of the freshwater deposit.. Outskirts. Diatoms. 99. Kayama. A list of diatoms showing the relative frequency of each species in the assemblage, provides a basis for determining such ecological conditions during deposition as fresh water, lacustrine, brackish estuary, shallow water marine, open sea, etc. According to my microscopical examination, it is found that the sample collected from the Kayama clay-shale, contains the following sixty-five species of. TABLE. of Diatoms. in the. City. Clay-shale. diatoms:—. List. of Kanazawa. I. and their. Habitats..
(4) 100. Wataru. ICHIKAWA.
(5) Fossil. Diatoms. found. in the. Kayama. Clay-Shale. on the Outskirts. of Kanazawa. TABLE II Recent. Species. found. in Japanese. Lakes. and. Ponds.. TABLE III Ecological. Character. of Species. (Kolbe's. Method). City. 101.
(6) 102. Wataru. Description Family. Tribe. SMITH (1856): Brit. 1. III, fig. 337.. a. Melosirinac. Melosira granulata. AG., 1821. (EHR.). W. SM.. RALFS.. Text-fig. 33, a, b.. OKUNO(1943): Japan. Diat. Dept., Bol. Mag. Tokyo, Vol. 57, No. 683-4, p. 366, Pl. I. fig. e. Valve long and narrow. Striae distinctly striate and punctate (a); Striae somewhat spiral and punctate, one extremity broadened in comparison with the other (b). Found in the diatomite of Yatsuka (Okayama), Kanou and Kawabe (Nagano), Hirazawa (Miyagi), Nakaterao (Yamanashi), and in the mudstone of Mitsuwa (Nagano).. Diat., Vol. II, p. 61, Pl.. Valve punctate; line of junction with somewhat distinct and subdistant denticulations. This species has arisen much confusion in the synonymy, hence here referred to the above-mentioned name. According to RAUENHORST,it is identical with Melosira oricltalcea (MERTENS) KTZ.. I. Discoideae. 1. Coscinodisceae. Sub-tribe. orichalcea. Text-fig. 43, a. b.. A. Centricae. Sub-family. Melosira. Orthosira. of Species. DIATOMACEAE. Section. Genus. ICHIKAWA. Sub-tribe. d. Ccscinodiscinae. Genus Coscinodiscus EHR., Coscinodiscus. eccenlricus. 1838. EHR.. Text-fig. 11. •. SMITH (1853): Brit. Dial., Vol. I, p. 23, Pl. III, fig. 38. Valve circular, spots arranged eccentric lines. Found in the clay Kahoku lagoon (Ishikawa).. in of.
(7) Diatoms. Fossil. found. in the. Outskirts of Kanazawa Genus City 103 Slephanodiscus Stephanodiscus. Kayama. Clay-Shale. EHR., 1845.. aegyptiacus. EHR.. Text-fig. 59, a. b, c. EHRENBERG(1854): Mikrogeol., T. XXXIV, fig. 16, a. Frustule undulate with margin. Valve circular radiating rows of spots, distinct as striae near the Stephanodiscus. spines on the covered with but rows are margin.. Brantaputrac. EHR.. Text-fig. 69. EHRENBERG(1854): IX, fig. 9.. Mikrogeol., T. XXXVA,. Valve plane or somewhat curved, rows of spots delicately radiate from the center, many large spots found at interval near the marginal part.. Tribe. V. Fragilarioideae. a. Fragilariinae. Genus Fragilaria Fragilaria. LYNGB., 1819.. diophthalma. Genus Synedra. EHR.. Text-fig. 25. EHRENBERG(1854): Mikrogeol., T. XII, fig. 2, a-h. Valve linear, cuneate at the extremities. It is identical cupucina DESMAZ.. subacute with F.. EHR., 1830.. Synedra rumpens KTZ. var. fragilarioides GRUN. Text-fig. 61. OKUNO (1940): Dial. Japan., I; Jour. Sci. Hiroshima, Ser. B, Div. 2, Vol. 4, p. 43, fig. 9. Valve narrow, lanceolate, both extremities round, in the middle part, somewhat broadened. Striae parallel, pseudoraphe linear. Found in the diatomite of Hirazawa (Miyagi), and in the mudstone of Nakamura Irizawa (Yamanashi). ulna EHR.. Text-fig. 62, a, b. SMITH (1853): XI, fig. 90.. 10. Fragilalieae. Sub-tribe. rostrate and middle part inflated. Striae slightly radiate. Found in the muddy substrata at Genbu-do (Hyogo).. Synedra. Section B. Pennatae Sub-family. on the. Brit. Dial., Vol. I, p. 71, Pl.. Valve lanceolate-acute, with parallel margins and rostrate extremities. Found in the diatomite of Ooike (Nagano), and in the mudstone of Mitsuwa (Nagano), Nakamura-Irizawa (Yamanashi). Sub-tribe. b. Diaio minae. Genus Odontidium Odentidium. KG., 1844.. mutabile. W. SM.. Text-fig. 42. Fragilaria. inflata. (HEIDEN.) HUST.. Text. fig. 26. OKUNO (1940): Dint. Japan., I, Jour. Sci. Hiroshima, Ser. B, Div. 2, Vol. 4, p. 40 4. fig. Valve. lanceolate,. both. extremities. SMITH (1356): Brit. Dial., Vol. II, p. 17, Pl. XXIV, fig. 290. Valve oval, elliptical or linear-acuminate; costae marginal distinct . Exceedingly variable in size and outline of valve. This species is identical with Fragilaria mutabilis (W. SM.) GRUN..
(8) 104. Wataru. Found in the diatomite of Kanou and Kawabe (Nagana), Ureshino (Saga), and in the mudstone of NakamuraIrizawa (Yamanashi), Mitsuwa (Nagano). Sub-family Tribe. VI. Heteroideae. 12. Achnanlheae. Sub-tribe. a. Achnanthinae. Genus Achnanthes. BORY, 1822.. Achnanthes. KRAS.. aueri. Text-fig. 1, a, b. KRASSKE(1949): Diat. Palagoniens und Feuerlands., Ser. A, IV. 14, p. 79, fig. 3. Valve lanceolate, with rostrate extremities, inflated in the middle part. Upper valve with narrow lanceolate pseudoraphe. Central part with horse shoeshaped hyaline space. Lower valve with narrow axial area. Striae slightly radiate.. ICHIKAWA. Achnanthes. lanceolata. (BREB.) GRUN.. Text-fig. 4. OKUNO (1940): Dial. Japan., I, Jour. Sci. Hiroshima, Ser. B, Div. 2, Vol. 4, p. 53, fig. 21. Valve elliptic-lanceolate, with broad rounded extremities. Upper valve with narrow pseudoraphe, and on one side a horse shoe-shaped hyaline space. Lower valve with narrow axial area. Striae slightly radiate. Found in the muddy substrata at Genbu-do (Hyogo). Genus Rhoicosphenia Rhoicosphenia. curvata. GRUN., 1860. (KTZ.) GRUN.. Text-fig. 54. MUROBUSE(1936): Diat. Ashi, Suisankenkyushi, Vol. 31, p. 3, Pl. I, fig. 14. Front of valve elliptical, toward epitica.. and it curves. Genus Cocconeis EHR., 1835. Achnanthes. brevipes AG.. Text-fig. 2, a, b. SMITH (1856): Brit. Dial., Vol. II, pp. 27-28, Pl. XXXVII, fig. 301. Valve linear-oval, with a slight central constriction. Spotted striae parallel. Achnanthes Hauckiana densistriata. GRUN. var.. HOR. et. OKU.. Text-fig. 3. OKUNO (1940): Diat. Japan., I, Jour. Sci. Hiroshima, Scr. B, Div. 2, Vol. 4, p. 52, fig. 20. Valve elliptic-lanceolate, with slightly rostrate extremities. Striae somewhat radiate. Found in the muddy substratum at Genbu-do (Hyogo).. Cocconeis placentula klinoraphis. EHR. var. GEIT.. Text-fig. 8. KOBAYASHI (1930): Dial. Destn. Ueno.,Japan. Jour. Limn., Vol. 14, No. 4, p. 195, Pl. I, fig. 8. Valve elliptical, striae delicately ated. Found in the Paddy-fields at City (Mie).. radiUeno. Cocconeis placentula EHR. var. lineatus (EHR.) CL. Text-fig. 9, a, b. OKUNO (1940): Dial. Japan., I, Jour. Sci. Hiroshima, Ser. B, Div. 2, Vol. 4, p 55. fig. 25. Upper valve with narrow. pseudoraphe..
(9) Fossil. Diatoms. found. in the. Kayama. Clay-Shale. Central area absent (a). Lower valve with raphe (b). Striae very fine, irregularily pointed. Found in the diatomite of Tochibori (Nigata), Ureshino (Saga), Hirazawa (Miyagi), Kanou and Ooike (Nagano), and in the mudstone of NakamuraIrizawa (Yamanashi), Kawabe (Nagano). Sub-family. VII. Navicrdoideae. Tribe 13. Naviculeae Sub-tribe. a. Naviculinae. Genus Navicula. BORY, 1822.. (Pinnularia EHR., 1840; Caloneis CL., 1891; Neidium PEITZ., 1871.) Navicula corlanensis. KRAS.. on the. Outskirts. of Kanazawa. 105. City. cal with Diploneis elliptica after CLEAVE. Found in the diatomite of Hirazawa (Miyagi), Kawabe (Nagano), and in the mudstone of Mitsuwa (Nagano) Nakaterao (Yamanashi). Navicula. placentula. (EHR.) GRUM.. Text-fig. 36, 38. SKVORTZOV(1937): Neo. Dial. Wamura., Coll. Sri. Kyoto, Vol. XII, p. 146,Pl. VI, fig. 11. Valve elliptical-lanceolate with subrostrate extremities. Striae radiate. Central area somewhat orbicular. Found in the mudstone of Kahoku Lagoon (Ishikawa). Navicula. subrotundata. HUST.. Text-fig. 34.. Text fig. 39.. KRASSKE(1949): Diat. Trop. Moosrasen. BD. 42, H. 4, pp. 443, T. II, fig. 3.. KRASSKE(1949): Diat. Patagoniens urd Feuerlards. Ser. A, IV. 14, p. 91, fig. 16, 17.. Valve linear lanceolate with three strong lines on both sides from the center. Striae radial, but indistinct.. Valve elliptical, striae ate. Raphe distinct.. Navicula. didyma. KTZ.. Pinnularia. somewhat. cardinalis. radi-. EHR.. Text-fig. 35.. Text-fig. 44.. SMITH (1853): Brit. Diat., Vol. I, Pl. XVII, fig. 154.. SMITH (1853): Brit. Diat., Vol. 1, p. 55, pl. XIX, fig. 166.. Valve elliptical, deeply constricted in the center; striae interrupted, distinct. This species is found very rarely in the fresh-water deposits of Japan. The structure of frustule somewhat differs from it of marine form.. Valve linear, extremities costae radiate, absent from of valve. Found in the diatomite and Coike (Nagano). Pinnularia. Navicula. ovalis W. Sr.. Text-fig. 37. SMITH (1853): Brit. Dial., Vol. I, p. 48, Pl. XVIII, fig. 153. Valve elliptical, occasionally inflated; striae distinct. This species was named N. elliptica by KUTZING and also identi-. Gastrum. rounded; the center of. Kanou. EHR.. Text-fig. 45. EIIRENBERG (1854): fig. 12.. Mikrogeol., T. V, I,. Valve attenuate, curved at the extremities; striae distinct. Found in the diatomite of Hirazawa (Miyagi)..
(10) 106. Wataru ICHIKAWA. Pinnularia. gentilis. (DONKIN) CL.. Pinnularia. radiosa. W. SM.. Text-fig. 46.. Text-fig. 51.. OKUNO (1940): Diat. Japan, I, Jour. Sci. Hiroshima, Ser. 13,Div. 2, Vol. 4, p. 62, fig. 37.. SMITH (1853): Brit. Dial., Vol. I , p. 56, Pl. XVIII, fig. 173.. Valve linear, with rounded extremities, slightly inflated in the middle. Central are widened. Striae somewhat divergent in the middle, convergent at the extremities. Found in the mudstone of Nakaterao (Yamanashi). Pinnularia. interrupta. W. SM.. Text-fig. 48. SMITH (1653): Brit. Diat., Vol. I, p. 59, Pl. XIX, fig. 184. Valve linear, constricted at the rounded extremities, costae absent from the center of the valve. Pinnularia. microstauron. (EHR.) CL.. Text-fig. 49. SKVORTZOV(1937): Neo. Dial. Wamura., Coll. Sci. Kyoto, Vol. XII. p. 146, Pl. V, fig. 6. Valve linear with subrostate-capitate extremities. Central area a broad stauros. Found in the mudstone of Nakaterao (Yamanashi), and in the diatomite of Kanou (Nagano). Pinnularia. nobilis EHR.. Text-fig. 50. SKVORTZOV(1937): Neo. That. Wamura , Coll. Sci. Kyoto, Vol. XII, p. 148, Pl. IV, fig. 1. Valve linear, somewhat gibbous in the middle and at the broadly rounded extremities. Striae convergent at the ends. Central area widened. Found in the diatomite of Kanou (Nagano).. Valve lanceolate, obtuse; ate, contiguous. Found in the mudstone (Nagano). Pinnularia. viridis. costae. radi-. of Mitsuwa. W. SM.. Text-fig. 52. Valve elliptical, attenuated, costae somewhat radiate, distant. Found in the mudstone of Ooike (Nagano) and Nakamura-Irizawa (Yamanashi) . Caloneis silicula. (HHR.) CL.. Text-fig. 6. SKVORTZOV(1937): Neo. Diat. Wamura., Coll. Sci. Kyoto. Vol.XII, p. 142, Pl. IV, fig. 12. Valve linear-lanceolate, slightly capitate extremities. Center of the valve shows rectangular dilated area. Found in the diatomite of Kanou and Kawabe (Nagano), Ureshino (Saga). Neidium. bisulcatum (LAGERST.) CL. var. nipponica SKV. Text-fig. 66.. SKVORTZOV(1937): Neo. Dial. Wamura., Coll. Sci. Kyoto. Vol. XII, p. 143, Pl. IV, fig. 8. Valve sublinear, attenuated the round extremities. Stauroneis. construens. towards. EHR.. Text fig. 56. EHRENRERG(1854). Mihrogeol., T. V, II, fig. 23. Valve small, cross-shape; ities round.. four extrem-.
(11) F ossil. Diatoms. found. in the. Kayama. Clay-Shale. the Cutskirts of Kanazawa Slauroneis City 107 dilatala W. SM. Text•fig. 57. SMITH (1853): Brit. Dial, Vol. 1, p. 60, Pl. XIX, fig. 191. Valve elliptical, extremities somewhat produced; stauros linear, not reaching the margin.. on. SMITH (1853): Brit. Diat., Vol. I, p. 60, Pl. XVIII, fig. 237. Valve slightly attenuated towards the upper extremities, which is rounded; much attenuated towards the lower, which is somewhat acute. Found in the diatomite of Mitsuwa (Nagano).. Stauroneis. phcenicenteron. EHR.. Text-fig. 58. SMITH (1853): Brit. Dial., Vol. I, p. 59, Pl. XIX, fig. 185. Valve lanceolate, with obtuse or somewhat rostrate extremities. Found in the diatomite of Hiraznwa (Miyagi), Ooike and Mitsuwa (Nagano), and in the mudstone of Kawabe (Nagano), Nakaterao (Yamanashi) , and in the clay of Kahoku lagoon (Ishikawa). Sub-tribe. b. Gomphonenunae. AG., 1824. Gomphonema acuminalum EHR. Text-fig. 28, a, b. c. SMITH (1853): Brit. Diat, Vol. I , p. 7P, Pl. XXVIII. fig. 238. Valve constricted somewhat triangular and apiculate above, attenuated below . Found in the diatomite of Ooike and in the (Yamanashi).. Gomphonema. mudstone. augur. of. Valve clavate, one extremity narrow rounded, other somewhat broad with apiculate apex. On one side the median striae with a stigma. capilatum. Text-fig. 30.. EHR.. SMITH (1853): Brit. Dial., Vol. I, p. 79, Pl. XXVIII, fig. 240. Valve lanceolate, slightly cuneate, truncated. This species is identical with G. dichotomum KTZ. Found in the diatomite of Kawabe (Nagano). lanceolatuna. EHR. var.. insignis (GREG.) CL. Text-fig. 32. SRVORTZOV (1937): Neo. Dial. Wamura., Coll. Sci. Kyoto, Vol. XII , p. 152, Pl. IV, fig. 2. Valve lanceolate. Extremities slightly constricted. Striae robust, on one side the median stria with a stigma, other side striae short. Found in the diatomite of Kanou (Nagano).. EHR.. Text-fig. 29. OKUNIO(1942): Dial. Japan. , II. Jour. Sci. Hiroshima, Ser. 13,Div. 2 , Vol. 4, p, 38, fig. 34.. Gomphonema. gracile. Text-fig. 31.. Gomphonema. Genus Gomphonema. (Nagano), Nakaterao. Gomphonema. EHR.. Sub-tribe. c. Cymbellinae. Genus Cymbella AG., 1830. (Cocconema Cymbella. EHR., 1829) affinis KTZ.. Text-fig. 12. SMITH (1853): Brit. Dial., Vol. I , p. 18, Pl. XXX, fig. 250. Valve elliptical-lanceolate, extremities slightly produced. Striae faint ..
(12) 108. Wataru. ICHIKAWA.
(13) Fossil. Diatoms. found. in the. Cymbella gracilliam. Kayama. Clay-Shale. HUST.. Text-fig. 13.. Sub-tribe. e. Pleurosigminae. Genus Pleurosigma. KRASSKE(1913): Dial. Trop. Moosrasen. BD. 42, H. 4, p. 436, T. II, fig. 41. Valve lanceolate, extremities gradually attenuate. On one side the median striae with a stigma. Cymbella proslrata. on the Outskirts of Kanazawa City 109. (BERK.) CL.. Pleurosigma. W. SM., 1853.. rigidum. W. SM.. Text-fig. 53. SMITH (1853): Brit. Diat., Vol. I, p. 64, Pl. XX, fig. 198. Valve linear-lanceolate; flexure slight; extremities rounded; median line central.. Text-fig. 14. SKVORTZOV(1937): Neo. Dial. Saga., Coll. Sci. Kyoto. Vol. XII, p. 168, Pl. X, fig. 16. Valve asymmetrical, subelliptical with arcuate dorsal and slightly arcuate at ventral margins or lunate with curvate extremities. Found in the mudstone of NakamuraIrizawa (Yamanashi). Cocconema cymbiforme. EHR.. Text-fig. 10. SMITH (1853): Brit. Dial., Vol. I, p. 76, Pl. XXIII, fig. 220. Valve narrow, concave margin scarcely inflated. Striae somewhat radiate, extremities gradually attenuate. Found in the mudstone of Nakaterao (Yamanashi),. Mitsuwa. Genus Amphora. (Nagano). EHR., 1831.. Amphora ovalis KTZ. Text-fig. 5. (1853): II, fig. 26.. Brit. Dial.,SMITH Vol. I, p. 19, Pl.. Valve exceedingly convex. Internal margin of valve inflated at the nodule. Striae spotted. Found in the diatomite of Kanou (Nagano), Hirazawa (Miyagi), Ureshino (Saga), and in the lignite bed of Hanamaki (Iwate).. Sub-family. Surirclloideae-Carinalae. Tribe. 15. Surirelleae. Genus Surirella. TURP., 1828.. Surirella. EHR.. Librile. Text-fig. 63. EHRENBERG(1854): fig. 23.. Mikrogeol., T. XXV, VII,. Valve elliptical acute, usually with a central constriction, canaliculi delicate. Genus Campylodiscus Campylodiscus. EHR., 1840.. cribrosus. W. SM.. Text-fig. 7. Valve nearly circular; surface with the characteristic contortion. Cells irregularly circular, in radiating lines. Found in the diatomite of Yatsuka (Okayama). Tribe. 16. Epilhemieae. Genus Epithemia Epithemia. BREB., 1844.. argus W. SM.. Text-fig. 16. SMITH (1853): I, fig. 5.. Brit. Dial., Vol. I, p. 12, Pl.. Valve slightly arched, extremities gradually attenuate. Canaliculi indistinct. Found in the diatomite of Ooike (Nagano)..
(14) Wataru. 110. Epithemia Hyndmanii Text-fig. 17.. W. SM.. ICHIKAWA. (Saga), Hirazawa (Miyagi), and in the tuffaceoas mudstone of Nukatsukayama. SMITH (1853): Brit. Dial., Vol. I. p. 12, Pl. I , fig. 1. Valve much and regularly arched, extremities rounded, not recurved. Canal'culi inconspicuous. Found in the diatomite of Yatsuka. (Nagano), and in the mudstone nnlra-Irizawa (Yamanashi).. (Okayama), Hirazawa Ooike Kawabe and Kanou (Nagano), Ureshino (Saga), and in the mudstone of N:IkamuraIrizawa (Yamanashi).. OKUNO (1944): Japan. Dial. Dep., Bol. Mag., Vol. 58, No. 685, p. 11, fig. 4, d-e.. Epithemia. longicornis EHR. Text-fig. 18. SMITH (1853): Brit. Dial., Vol. I, p. 13, Pl. XXX, fig. 248. Valve somewhat angular ridge, extremities obtuse. Epilhemia Musculus Text-fig. 19.. in the dorsal. Epithetnia zebra (EHR.) KTZ. var, porcellus (KTZ.) GRUN. Text-fig. 22.. Valve slightly arched, extremities attenuate. Canaliculi indistinct. Genus Rhopalodia Rhopalodia. long. O. MULL.., 1895.. gibba (EHR.) O. MULL. Text-fig. 55.. MUROBUSE(1936): Dial. Ashi., Suisanketkyushi. Vol. 31, No. 6, p. 8, Pl. III, fig. 4. Valve linear, extremities.. inflated. at center. and. KTZ.. SMITH (1833): Brit. Diat., Vol. I, p. 14, Pl. I, fig. 10. Valve regularly and strongly arcuate, extremities acute. Canaliculi distinct. Epithemia sorex KTZ. Text-fig. 20. SMITH (1853): I, fig. 9.. of Naka-. Tribe. 17. Eunotieae. Genus Eunotia Eunotia. EHR., 1837.. praerupta. EHR.. Text-fig. 23. EHRENBERG(1851): Mikrogeol., T. II, fig. 27. Valve lunate, arcuate with extremities. I'seudorodules Striae robuste.. recurved distinct.. Brit. Dial., Vol. 1, p. 13, Pl.. Valve attenuate, slightly recurved at the extremities, dorsal line highly arcuate. Canaliculi minute, indistinct. Epithemia turgida W. SM, Text-fig. 21. SMITH (1853): Brit. Diat., Vol. 1, p. 12, Pl. , fig. 2. I Valve slightly arched, extremities suddenly attenuate, obtuse. Canaliculi distinct. Found in the diatomite of Yatsuka (Okayama), Kanou (Nagano), Ureshino. Eunotia zebrina EHR. Text-fig. 24. EHRENBERG(1854): fig. 23.. Mikrogcol., T. IV,. II,. Valve recurved at the obtuse extremities. Striaes large. This spxcies bears some reseniblance to genus Epilhenzia. Sub-family Tribe. X. Nitzschioidcae 18. Nitzschiae. Genus Nitzschia Nitzschia. HAS., 1845.. bilobata W. SM. Text-fig. 40..
(15) Fossil. Diatoms. found. in the Kayama. Clay-Shale. the OutskirtsSMITH of Kanazawa (1853):CityBrit. 111 Diat , Vol. I, p. 42, Pl. XIII, fig. 112. Frustule elliptical, with a central constrictions and round or truncate extremities Nitzschia Plana W. SM. Text-fig. 64. SMITH (1833): Brit. Diat., Vol. I, XV, fig. 114.. sigmoidea. (EHR.) W. SM.. Text-fig. 41. SMITH (1853): Brit. Diat., Vol. I, p. 38, Pl. XIII. fig. 104. Valve linear, suddenly tapering towards the acute extremities; keel with a single line of puncta. Genus Hantzschia (Denticula. The nineteen species of the fossil diatoms in the Kayama clay shale are found in Japanese lakes and ponds. Fourteen of them are, in their ecological characters, known as Oligohalob. Fifty one of the species are all known existing in freshwater. The Kayama clay-shale, therefore, belongs to fresh-water origin. The Kayama clay-shale is one facies of the Utatsuyama. bed. From this reason some part of the Utatsuyama bed is of fresh-water origin, and it differs from its bed rock of the Onma series which is of marine origin.. GRUN., 1877. KG., 1844). Hantzschia amphioxys (EHR.) GRUN. var. xerophila GRUN. Text-fig. 65. SKVORTZOV(1936): Neo. Diat. Ampen., Rep. yosen Geol. Sur. No. 12, p. 34, Pl. TIV, fig. 9. Valve linear-lanceolate with constricted ventral and convex dorsal margins. Extremity subrostrate. Denticula. brance to Surirella robusta. Some of the other remaining diatoms contain fragments of Coscinodiscus sp., Tryblionella sp. and Achnanthes sp. besides the sixty-five species above-mentioned.. SUMMARY p. 42, Pl.. Valve elliptical, slightly constricted towards the center and tapering toward the somewhat truncate extremities. Nitzschia. on. obtusa KTZ.. Text-fig. 15. SMITH (1856): Brit. Diat., Vol. II, p. 19, Pl. XXXIV, fig. 292. Valve lanceolate, or linear, and attenuate towards the extremities, which are obtuse; striae delicate and not found commonly. Many fragments of frustules are found in the Kayama clay-shale. Some of them seem to bear a remarkable resem-. References ICHIKAWA,W. (1950): The Correlation of the Diatom-bearing Mudstones in the Note Peninsula and the Vicinity of Kanazawa City. Jour. Geol. Soc. Japan. Vol. 56, No. 653, pp. 49-56. IKEBE, N. (1949): Tertiary Stratigraphy of Western Toyama and Ishikawa Prefectures. Sci. Ear. Vol. I, No. 1, pp. 2324 KOLBE,R. W. (1927): Zur Okologie, Morphologie and Systematik der Brackwasser diatomeen: Die Diatomeen des Sperenberger Salzgebietes. Pflanzenforschung, Heft 7. MOCHIZUKI, K. (1930): Topography and geological Structure of the northern End at Kaga-Mino Mts. Jour. Geol. Soc. Japan. Vol. 7. No. 445, p. 492. ONOYAMA,T. (1933): The Tertiary in the Neighbourhood of Kanazawa City, and Isurugi, Toyama (2 parts), Pts. 1-2. Clzikyu, Vol. 79, No. 3, pp. 173-195; No 4, pp. 245-286..
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