ASmdyontheNeogenePlantsoftheInnerSideofCentralHonshu (HokurikuRegion),Japan.I11.OntheI@zenFlOra
by
HidekuniMATsuo*
(ReceivedJan､5,1970)
I:Introduction
13
Thel6zenHora(医王山植物群)inthel6zenformation(医王山累層)isexposed ontheNorthernpartoftheKanazawaCity,CentralHonShuinJapan.
ThisflorawasdiscoveredbyN.NAKANIsHI(中西信弘),amemberofKanazawa University,whenhestudiedonthegeologicalsurveyatthepiedmentofMt・I6zen (医王山),whichrisesonthenorthofKanazawaCity(石川県金沢市)andhasan
altitudeof939m.
Theoccurrenceofthemacroplantfossilsofthel6zenformationisanew evidenceoftheHokurikuMioceneHora,andinthisfioraarenotfoundsomany fossilspeciesasweexpectfromtheoccurrenceofthematerials,alsothereare threespecies,namely""c"''〃"α蜘加,M6zc"""ssp.and"9"jdα"6αγ〃"os"ica・
Beforeproceeding,IwishtoexpressmysincerethankstoMr.N.NAKANIsHI, amemberofthelnstituteoftheEarthScience,FacultyofScience,Kanazawa University,wmkindlygavemeoriginalgeologicalnotesandmanycollectionsof
thisaora.
II:GeologicalNotesoftheIozenFormation
FollowingthegeologicalnotesofN.NAKANIsHI(H.MATsuo&N・NAKANIsHI:
1967;pp.289‑292),Ihaveanunderstandingofthegeolgicalsuccessionofl6zen fOrmation,asfollows;
Signoflayer Characteroflayer thickness
S,−−−−Fallenpyroclasticlayer 30m<
#三三驚… 驚く
I6zenFormation
二 篭 Ⅷ 篭
20m<
*D"αγｵ碗e"Z"Geo/Ogy
HidekuniMATsuo 14
TheplantmaterialsarefoundintheS2‑layerofthesel6zenpyroclasticrocks (医王山火砕岩類)．
Thel6zenformationliesinthelowestpartofthemiddleMioceneageinthe Hokurikuregion.AccordingtoN・NAKANIsHI'stable‑1(Op.cit.;p.287)isfollowed
intable‑1.
ａ三ｍｖ︾ａａ
ｖ︾ＭＯ
Ｔ一
Fig.‑1:SituationalmapoftheFutam Area,KanazawaCity.
ta a
ろ◎
i
Table‑1:Stra廿graphicalpositionoftheMiddleMioceneagein theHokurikuRegion.(afterN・NAKANIsHI;1967)
−１
￨Ag｡ l HokurikuRegion OutskirtsofKanaZaWaCity
Pliocene HimiFormation(氷見累層） OnmaBed(大桑層）
− −
TakakubomudsmneBed
（高窪泥岩層）
OmkawaFbrmation(音川累層）
KuraharasandsmneBed
（蔵原砂岩層）
Upper HigashibesshoBed
（東別所層）
OminemudsmneBed
（御峯泥岩層）
のロの○○弓﹈宮
Yatsuo Fbrmation (八尾累層）
TsuchiyamamffaceousBed
（土山凝灰岩層）
KurosedaniBed
（黒瀬谷層） Sunagozakamffaceousalter‑
natedlayersBed
（砂子坂凝灰質互層）
Middle
口
I6zenpyroclasticBed(orI6zenvolcanicrocks)
（医王山火砕岩層）
I6zenFbrmation
（医王山累層）
Onthel6zenFlora 17
Notonakajima,NoroshiandKuragatakefioralzone.Especially,Irecognizeda remarkablediferencebetweenKuragatakeandtheothertwoyoungerfloralzones.
IconsideredthatthisdiHerencecomesfromtheexistenceofaclimaticchangein the@GD"z伽a−tybe''fiora.
Now,thel6zenphytozonehasafewcompositionalelements,soIconsidered thatitcannotbecomparedwiththeothertwoyoungerHoralzones・However, accordingtothetable‑2,Iaminterestedinthefactthattheserrated‑margin evergreentreescouldnotbefoundmtheKuragatakefioralzone.Andlwouldguess thattheabovementionedevidenceshowsnootherthanthetropicalcondition.
Inevidenceofthis,IgiveexamplesoftwoPaﾉwzo"JO"specieswhichhadbeen collectedfromtheterracedepositsintheSai‑kawa(犀川)andAsanogawa(浅野川）
riversrunningthroughtheKanazawaCity.ThesespeciesareP. αed"eOGuRA (1952:pp.223‑230)atKenroku‑en(兼六園)andR"zZgzze"seOGuRA(1955:pp.
85‑87)atAsanogawa,andthesehadbeendescribedasthenewspeciesbyDr.Y.
OGuRA.Andmore,atrunk(thesamesizeastheKenroku‑enspecimen)ofR 沈αedtzewasfoundfromtheterracedepositsatFukuro‑machi,KanazawaCity(金沢 市袋町)inl960(thisarticlehasbeenkeptinpersonalcustody,atFukuro‑machi).
Theoccurrencesofafewpalmaeantrunksshouldbeyieldedinthel6zenGroup, whichrangedfromthelowerMiocenetothemiddleMioceneinageanddistributed fromthemid‑streamtotheupperreachesofthetworivers(Sai‑kawaand Asanogawa).
Table2:Onthe"Dα域加a−tyPe"florasintheHokurikuregionseenfrom themorp加logicalfeamresofleaves.
IMIAIBIE￨'￨D￨@ilc&
１１
2 5 1 3 2 4 4 2
1 1 2 3 2 2 5 5
ユユユ2．，，￨】
Notonakajimafloralzone Noroshifloralzone
Kuragatakefloralzone
Table‑3:OnthemorphologicalfeamresoftheleavesoftheKuragatake floralzone.
一
￨"￨AIBIEIglD￨@'lc,
1 1 1 2 20 5 1
1 1 0 2 0 2 5 1 O I O I O I 1 1 0 1 5 1 4 1 0 Kuragatakephytozone
Torigo6phytozone I6zenphytozone
M:MonocotyledonsandPteriophyta,A:Evergreenneedle‑leaves,B:Deciduousneedle‑
leaves,E:Evergreenbroad‑leaves(entiremargin)e:Evergreenbroad‑leaves(serrate margin),D:Deciduousbroad‑leaves(entiremargin),d:Deciduousbroad‑leaves(serrate margin),C,:CO"ゆわれゆﾉ2y"""z〃α" α""jand"9"〃α"6αγ加josi"icamne,C2:CりwWo"j‑
、
p幻""加泥α" α"畑，1：1.0％，2：1.1‑5.0%,3:5.1‑15%,4:15.1‑30%and5:30.1%<
18 HidekmiMATsuo
IV:SystematicDescriptionsoftheI6zenFlora
FamilyLAuRAcEAEA
MLzc"〃"SSp.
PlateI,figurel.
Thisspecimenlackingtheupperparthasaveryclosesimilarityinshapewith thatdescribedasM"C"〃"s〃gひα"αHuzloKA,whichhadbeennotedbyK・HuzIoKA inl961・Accordingtohisnote,heconsideredthattheM."gOα"αmaybebelonged tothelivingspeciesofMノ"O"C"SIEB・etZucc・fromthemountainousforestof thesubtropicalclimaticcondition,andtoMIo"g秒α"jc"地加HAYATAinFormosa (Taiwan).
Thoughonlyonespecimenisregisteredathand,Iamconvincedthatthis materialcouldbecomparedwiththeM"gひα"αoftheMiocenespeciesandthe livingspeciesofMノα加"ic".
Reg.No.=DGLAKZ‑14037.
FamilyHAMAMELIDAcEAE
〃9""加加γ josi"jc"HuetCHANEY
Platel,fgures2‑6.
1940:"9"〃α加6αγ〃jos/"jc"HuetCHANEY;Carn．hst・Wash.Pub.No.507, p.46,Pl．XXIII,figs、1and2.
1963:Z,、班josi"ic",TANAI;TertiaryFlorasofJapan,p.128,pl.XXIII, figs、6,8and11.
1963:Z,．班jos/"jczz,HuzIoKA;Ibid.p、204,pl.XXXIII,f9.7andpl.
xxxv,h9.1.
1963:Z,.wcjosi"ic",MATsuo;Ibid．p.239,p1.L11,n9s.4and5.
ThefossilleavesofthiskindfromJapaneseMioceneagehavelongbeenknown asZ,/9"〃α伽6αγんγ 0sα"αofthelivmgspeciesname・ButTANAI,HuzIoKAandl prefertoassignthenamewithwhichHuetCHANEYindicateditsitsstatusasa Tertiaryplant(thespeciesnamemeanstheMiocenespeciesinChina).
Reg・Nos.=DGLAKZ‑14032(fmit),‑14057,"‑14082a,‑14037and‑14082b.
Onthel6zenFlora 19
hcertaeSedis
"岡C"S"〃"α"b"a(HEER)
Platell,nguresl‑4.
1962． 岡C"S"が"α加"αHEER,TAKAHAsHIetOBATA;Trans.Proc.Palaeont.Soc.
Japan,N、S､,No.46,pp、263‑271,pl．XLI,ngs、1and2.
Thesedeciduousbroad‑leavedspecimenshaveanaccountfor70%ofall collections,andhavenotyetassignedanytaxonomicalposition.
Now,IagreetoTAKAHAsHI'sopinionthatthename6CFYc"s"〃"α碗"a(AL.BR.）
HEERs畑uldbeusedforthisspecies・Accordingtohisopinion,asfollowS(K.
TAKAHAsHIetl・OBATA;1962,p.270);"一一一hJapanhatmanoftdenNamen Ma"/eaα〃"αJ物"αangenonmmen,mEuropaB"""e"αα〃"α/純"α.Emegrosse morphologische盈加lichkeithabendiealttertiareForm"c"s〃"α加"αu.a.unddie jungtertiareB"""e αα〃"αﾉ物"a(oder"""2αα〃"J加"α).MitanderenWorten :beidekannmanderselbenmorphographischeKategoriestellen.Damanaberdie gleichenBlattabdriickesowohlinalttertiarenwieinmiozanenSchichteninvershi‑ edenenGebietenvonEuropa,AsienundAmerikafndenkann,mussdasProblemder Benennungsehrwichtigangesehenwerden".
Reg・Nos.:DGLAKZ‑14049,‑14098,‑14058and‑14034.
V:HabitatoftheI6zenFlora
Inotedthatthemorphologicalchangeofleafwassusceptibletoinfluencesfrom thesupplyofthewater.Especially,thewatersupPlyhasagreatinfluenceonthe leavesofZ,j9"〃α"､伽γ允γ加0sα"a(1966:pp.14‑15).
Ontheassumptionthatthel6zen"9"〃α加加γislinsize,theNotonakajima speciess伽wsO．8andtheTorigo6speciesgivesmeasureofl．5．Thehabitatofthe Notonakajimafloraisconsideredtobeanaridsoilconditionasthemountainous lands,butthelatterTorigo6Horagrowsattheriver‑sideormarsh‑sidewhichhad adenseT"""species.
Comparedwiththelivmgspeciesmthewitheredordryleaves,theTorigo6 specimensshowsthesamesize.Sothel6zensizeisrecognizedthatitwasgrown atpiedmontregion,byreasonthatitisamediatesizebetweentheNotonakajima andtheTorigo6.
OntheMfzc"""ssp.,itresemblesverycloselythelivingspeciesofJapan, whichisfoundinthemountainouslandinthesubtropicalregioninAsia.
ThreesiliceoustrunksoftwoP"ﾉ"@oZyJo"specieshasbeenascertamedtobein
20 HidekuniMATsuo
theterracedepositsoftheoutskirtsoftheKanazawaCitythathadbeentransported fromthepiedmontofMt.I6zenbytheoldco‑streamoftheSaikawaandAsanogawa.
Then,thel6zenfioraisrecognizedtohavebeengrownintheplamtothehilly landinthesubtropicalconditionwhichmaybesuggestedtol8o±2｡Cinannual averagetemperature.
References
Hu,H.H.(胡先繍)&R.W・CHANEY(1940):AMioceneFlorafromShanmngProvince, Chma.Caγ.I"s#.W"s".乃め．Ⅳひ.50ZZ‑14Zカノs.I=LWr.
OGuRA,Y・（小倉謙)(1952):AfOssilPalmmKenrokuParkatKanazawa.Z》てz"s、丹りc・
Hﾉα "/.Soc.Jtzpα",".S.,Nb．8,223‑230,,J.XXr.
‑‑‑‑‑‑‑‑‑‑.(1955):AfOssilPalmtrunkfromKanazawa.〃〃.No.Z9,85‑8冗加0ノガ9s・
MATsuo,H(松尾秀邦)(1966):北陸地方の新第三紀植物群について,FFoss",NNo.Z2,9‑Z6.
‑‑‑‑‑‑‑‑‑‑(1967):PalaeogeneFIorasofNorthwesternKyOshO,Partl.TheTakashima FIora.A""､動＃.K""αzα"αU》".,Vb/、4,Z5‑6尻〃s.I=XI.
̲̲̲̲̲̲̲̲̲̲̲&N.NAKANIsHI(中西信弘)(1967):金沢市医王山北麓部の医王山累層並びに医王 山植物群Cりれ師6.CWeb.Pm/:I.HAYASAKA's76MB航"αqy,287‑296,pﾉs・
I & 〃 ．
TAKAHAsHI,K.(高橋清)&I.OBATA(小畠郁生)(1962):DieSogenannte""c"s"〃"αa/b"α (AL.BR.)HEER.〃α〃S・月℃c.P"leo"ｵ.Soc.ルカα",ZV.S.,NNo.46,263‑2刀，
カノ.XLI.
TANAI,T.(棚井敏雅)(1967):OntheHamamelidaceaefromthePalaeogeneofHokkaido, Japan.肋〃，Ⅳひ.66,56‑62,′ﾉs.W&Wr.
̲̲̲̲̲̲̲‑‑‑‑,K.HuzIoKA(藤岡一男)&H.MATsuo(Ed.R.W.CHANEY)(1963):Tertiary FIorasofJapan,MioceneFloras.Co"α6.Ass・Co"加．8α〃A"".Geo/.S"γ"・
ノ α",Z‑262,'/s､I=LW.
Plate‑I
(×0.9）
Fig．1:M"c〃〃ssp・
DGLAKZ‑14037
Figs.2‑6:"9脚〃α籾6αγwziosi"c"HuetCHANEY
Fig.2showsafruiteofL．"zios"/ca.DGLAKZ‑14032 Fig･3DGLAKZ‑14057
Fig、4DGLAKZ‑14082‑A Fig，5DGLAKZ‑14037 Fig.6DGLAKZ‑14082‑B
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