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A New Deep-water Decapod Crustacean Faunule from the Early Miocene of the Styrian Basin, Slovenia

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A New Deep-water Decapod Crustacean Faunule from the Early Miocene of the Styrian Basin, Slovenia
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  GEOLOSKI ZBORNIK 22 ISSN 0352-3802 RAZPRAVE V POROCILA Treatises Reports 21. posvETovANJE SLOVENSKTH GEOLOGOV 2l't Meeting of Slovenian Geologists ODDELEKZAGEOLOGIJO Ljubljana 2013  GEOLOSKIZBORNIK 22 Razprave- poroiila 21.posvetovanje slovenskih geologov 2l"t Meetingof SlovenianGeologists Ljubljana, mareco2013 lzdala in zaloLila: Univerza v Ljubljani N aravoslovnotehn i Ska fakulteta Oddelek za geologijoA3kerdeva 12,1000 Ljubljana,Slovenija Glavniurednik: Bo5tjan RoZid Oblikoval in tehniinouredil: Matej Fister Naslov uredni5tva:UL NTF, Oddelek za geologijoPrivoz11, 1000 Ljubljana,Slovenija Tisk Tiskarna BirografikaBori d.o.o. Linhartova cesta 1 1000 LjubljanaNaklada: 140 izvodovZa jeztkin vsebinoprispevkov so odgovomiavtorjiPrispevki so razvrSdenipo priimkihprvih avtorjev Ljubliana,20l3 rssN 0352-3802 Naslovnica: Shcmatskistolpci iurskih plasti na BegunjSdici(glc.i prispevck Praprotnik et al. na str.127) Zadnja stran: Gcoloika kartaoZjega obmodiakamnoloma Crnotide (glei prispevek Pogadnik c1 al. na str. I l9) il  21. POSVETOVANJESLOVENSKIHGEOLOGOV 21't MEETING OF SLOVENIANGEOLOGISTS Organizator - Organizedby: Univerza v Ljubljani NaravoslovnotehniSka faku lteta Oddelek za geologijo Aikerdeva l2 I 000 Ljubljana,Slovenija http ://www.geo.ntf.uni-lj.si/posvet/ Organizacijskiodbor - Organizing Committee: doc. dr. Bo5tjan RoZid-predsednik Matej FisterSpela Turic Tomislav Popit III  Ceoloiki zbornik 22 A NEW DEEP-WATER DECAPOD CRUSTACEAN FAUNULEFROMTHEEARLY MIOCENE OF THE STYRIANBASIN, SLOVENIA Rok Gafipariil& Mafii ayi."f tLiublianska cesta 4i, I 24 I Kamnik, Sloveniia;rok gasparic@tgmail.com 2 Departmentof Geologtand Palaeonktlogt, Faculty ofNatural Sciences, Comenius[Jniversity,Mlynsklt dolina G l, Bratislava842 I 5. Slovakia;hyzny.matus(i)gmcil.com Previously, decapods from the Miocene strata in the Slovenian part of the StyrianBasin were reported by Glaessner (1928) and MikuZ (2003). ln this contribution wepresenta report on anew decapodcrustacean faunulefrom therespective area. The studied locality is situated approximately l5 kilometers west ofMaribor, alongthe steep valley of the DravaRiver. The decapodbearinglayers rvere exposed during road renovationworks on alocal road connecting the townsofRuSe and LovrencnaPohorju and are part of a Miocene sedimentarybasin running from Maribor onthenorthern slopes of Pohorje plutonicmassiftowards Radlje. Figure l: Geographicalpositionofthe lossillocality withsimplified geokrgical sketch l':rffil QuaternaryalluviaIdeposits l.--T:1|... I Miocenemarin€sedimentsL-++Jl* * +lL.**lPohorjeMetarnorphic series R-NI Kozjak metamorphic series irovEhlA Fohorje 38  2 l. posvetovanjeslovenskih geologot Fossilbearing micaceous laminatedsiltstones are part of the lvnik beds (Miod, 1972), overlaying sequences of looselyboundchaotic conglomerates and sandstones. Conglomerates are composed mainly of pebbles of metamorphic rock and pohorjegranodiorite (Pav5id & Horvat,2009). Results of nannoplanktonsampling (Bartol et al., in print) indicate the Karpatianage (nannoplankton zone NN4), based on coexistence of Sphenolithusheteromorphl;s Deflandre,1953 and Helicosphaera ampliapertct Bramlette and Wilcoxon, 1961 . The Karpatiansignifies the beginning of the marine sedimentation regime in thebroader realm ofthe Central Paratethys and represents a short flooding event that resulted fromopening of a marine passagebetween the Paratethys and the Mediterranean Sea i.e. Slovenian corridor (Rtigl, 1998). Synrift tectonics with rapid subsidence of narrow elongated sedimentation basins at thebeginning of Karpatian (Jelen & Rifelj, 2002) andthe described foraminiferal assemblage indicatebathyal conditions with the basin depthexceeding 500 meters (Fodor et alr.,2002). Our observation of decapodcrustaceansand ihe associated assemblage confirms the bathyal character ofthe investigatedfauna. The sampleconsists of 245specimens of decapod crustaceanicollected by one of the authors (RC) and housed at the"Rok Ga5parid paleontological collection", part of paleontologicalcollections of Slovenian Museum of NaturalHistory.Studied specimensarecompressed insidethesiltstonesand mainly retainthesrcinal cuticle. Many decapods are still articulatedwhich,consideringtheir fragility, impliesalvery calm sedimentationenvironment andexcludesanygreaterpost mortemtransportation.Preliminary results allow us to assign the investigatedspecimens to the iollowing taxa: Order Decapoda lnfraorder Axiidea c ail a nasa "t. * i, niffi'Jrff iiTTilffi *or, I s60 (F i g. 2.A) Thematerial consists of three specimens. Onlymajor cheliped propodui (in one case associated with dactylus)is preserved.The material differs from Callianassct michelottii in the nature of lateral propodalsurface. ln C. michektnii it typically has longkeelextending ontothe fixed finger accompanied withtwo furrows.In our material the keel is faint andthe furrows do not seem to bepresent. More andbetter preserved materialmay resolve the affinitiesof thestudied material. rhe materiar consists 'rrnfJ'!i!,ffiJ%I:'3i?;3)r0"",rn"ns exhibits a major chera (propodus articulated with dactylus its shapedoes not correspond to anyothercallianassidspecimenrecovered at the locality).Lepidophthalmasn. sp. (Fig.2.C)Thematerial consists of l9 specimens. Usuallymajorcheliped propodusis preserved;sometimes articulated with dactylus. ln one case major chelaisassociated with minor chela. Theassignment of the materialto Lepidophthalmusis based on these characters: l) typical shape of minor chela, i.e. squarepropodus with long fixedfinger,whichis relatively'nlghproximally, no teeth or serration is present on occlusal margin of both fingers;2)-maj"or chela consistingusually of massivepropodus with highdactylus,distalmargin ofpiopojus bears a single blunttoothbelow the articulation with dactylus; 3) ovoid merus in outline 39
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