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Lower Maastrichtian Ammonites from Neuberg, Steiermark, Austria

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Lower Maastrichtian Ammonites from Neuberg, Steiermark, Austria ©Verein zur Förderung der Paläontologie am Institut für Paläontologie, Geozentrum Wien Beitr. Paläont. Österr. 1 2 :1 8 1 -2 4 2 , Wien 1986 Lower Maastrichtian ammonites from Neuberg, Steiermark, Austria Unter-Maastricht-Ammoniten von Neuberg in der Steiermark (Österreich) by W. J. KENNEDY* and H. SUMMESBERGER** KENNEDY, W. J. & SUMMESBERGER, H., 1986: Lower Maastrichtian ammonites from Neuberg, Steiermark, Austria. — Beitr. Paläont. Österr. 1 2:181—242, Wien 1986. SUMMARY Die Revision ergab, daß die gesamte Fauna (14 Taxa) aus einem etwa 20 Meter mächtigen Schichtpaket stammt. Revision of the celebrated Maastrichtian ammonite Der kleine Steinbruch am Westende von Krampen exi­ fauna from the Gosau Group of Neuberg, Steiermark, stiert noch und schließt die gesamte Folge auch heute Austria revealed a diverse assemblage from a 20 m se­ noch relativ gut auf. Es handelt sich um graue, sandig-sil- quence of terrigeneous clastic sediments: Partschiceras tige Sedimente terrigener Herkunft, die unter Bedingun­ forbesianum (D’ORBIGNY, 1850), Anagaudryceras lue- gen tieferen Wassers (Zoophycos Fazies) abgelagert wor­ neburgense (SCHLÜTER, 1872), Anagaudryceras sp., den sind. Die unterlagernde Serie heller, gröberer Sand­ Saghalinites wrighti BIRKELUND, 1965, Pseudophylli- steine, Konglomerate und Brekzien (Textfig. 2) ergab kei­ tes cf. indra (FORBES, 1846 a), Pachydiscus (Pachydis- nerlei stratigraphische Anhaltspunkte. Überlagernde Ge­ cus) neubergicus (VON HAUER, 1858), Pachydiscus (Pa­ steine sind nicht aufgeschlossen. chydiscus) epiplectus (REDTENBACHER, 1873), Menui- Mikrofauna fehlt weitgehend. Nanhoplankton ist sel­ tes costatus sp. nov., Diplomoceras cylindraceum (DE- ten. Nur eine Probe ermöglicht eine Einstufung in das Nan- FRANCE, 1816 ), Diplomoceras sp. indet., Eubaculites ly- noplankton-Zonenschema: CC 25 b. Dieses Ergebnis, um­ elli (D’ORBIGNY, 1847), Hoploscaphites constrictus (J. gesetzt in die Begriffe der Belemnitenstratigraphie der SOWERBY, 1817) and Hoploscaphites ? sp. The Neuberg Schreibkreidefazies, ergibt für Neuberg eine Einstufung fauna is in stratigraphic isolation and can be dated only by in die mittlere sumensis-Zone und/oder jünger. Dies ist comparison with other Maastrichtian sequences. When der tiefere Teil des oberen Untermaastrichts. Die Aus­ compared with north-west European successions it can be wertung der Ammoniten ergibt einen Schwerpunkt um shown to be lower but not lowest Maastrichtian in age. In die Wende vom unteren Untermaastricht zum oberen terms of nannoplankton stratigraphy it is equivalent to Untermaastricht (B. lanceolata ZJB. occidentalis Z.). the Arkhangelskiella cymbiformis Zone (CC 25 b). This Die systematische Revision der Pachydisciden hat er­ is in terms of belemnite zonation middle sumensis Zone geben, daß der indischen Art Pachydiscus (Pachydiscus) and/or younger. chrishna (FORBES, 1846) Priorität über Pachydiscus The dominance of species with cosmopolitan distribu­ (Pachydiscus) neubergicus (HAUER, 1858) zukommt. tions during the Maastrichtian (e.g. Partschiceras forbesia­ Jedoch wurde ein entsprechender Antrag bei der Interna­ num, Pachydiscus neubergicus, Diplomoceras cylindra­ tionalen Kommission für Zoologische Nomenklatur ein­ ceum, Eubaculites lyelli) together with the occurrence of gebracht (KENNEDY & HENDERSON, im Druck), die species that are widespread in the White Chalk facies of Priorität des FORBES’schen Artnamens zugunsten des NW Europe (e. g. Anagaudryceras lueneburgense, Saghali­ Artnamens neubergicus zurückzustellen. nites wrighti, Hoploscaphites constrictus) shows the Neu- Es zeigte sich ferner, daß der REDTENBACHER’schen berg area to have been in free marine communication with Art Pachydiscus (Pachydiscus) epiplectus (REDTENBA­ other areas, notably the north and north-west. CHER, 1873) Priorität über zahlreiche, zum Teil gut ein­ geführte Namen besitzt. ZUSAMMENFASSUNG Überwiegend kosmopolitische Arten wie Partschiceras forbesianum, Pachydiscus neubergicus, Diplomoceras cy­ Der Steinbruch in Krampen bei Neuberg (Steiermark) lindraceum, Eubaculites lyelli und eine Reihe von Arten, hat in der Mitte des 19. Jahrhunderts eine Reihe von Am­ die vor allem in der Weißen Kreide Nord- und Westeuro­ moniten geliefert, die von HAUER (1858) und REDTEN­ pas verbreitet sind (Anagaudryceras lueneburgense, Sag­ BACHER (1873) beschrieben worden sind. Neuaufsamm- halinites wrighti, Hoploscaphites constrictus), zeigen an, lungen sind eher unergiebig. Die Fauna wird in dieser Ar­ daß im Untermaastricht ganz allgemein gute Migrations­ beit systematisch revidiert und eine stratigraphische Ein­ möglichkeiten, besonders aber in den Norden und Westen stufung vorgelegt. des heutigen Europa bestanden haben müssen. * Geological Collections, University Museum, Oxford. 0X1 3PW, U. K. ** Naturhistorisches Museum Wien, A-1014 Wien, Austria. ©Verein zur Förderung der Paläontologie am Institut für Paläontologie, Geozentrum Wien 182 Beitr. Paläont. Österr., 12, Wien 1986 INTRODUCTION three additional species, Ammonites neubergicus HAUER, 1858, Scaphites multinodosus HAUER, 1858 and Scaphi- The fauna described in the present contribution is that tes equalis J. SOWERBY, 1813. REDTENBACHER revis­ of the classic Maastrichtian locality of Neuberg in Steier- ed the Gosau ammonites in 1873, and pointed out that mark, Austria. This is the type locality of Ammonites neu- HAUER’s S. multinodosus was a synonym of Scaphites bergicus HAUER, 1858, a widely quoted Maastrichtian in­ constrictus J. SOWERBY, 1817 and that hisS. equalis al­ dex fossil, and we illustrate and describe the type material so belonged to that species. REDTENBACHER described and a series of topotypes of the species plus other elements two new forms, Ammonites anaspastus REDTENBACHER of the ammonite fauna as a contribution to our understand­ 1873 andAmmonites epiplectus REDTENBACHER 1873, ing of Maastrichtian ammonite taxonomy and biostratigra- as well as recording Ammonites neubergicus, Ammonites phy. spec, indet. cfr. Ammonites lünebergensis SCHLÜTER, All of the material mentioned in the literature or in 1872 Scaphites constrictus, Hamites cylindraceus and museum collections is labelled ’Neuberg', ’Krampen' or Baculites faujassi LAMARCK, 1822. REDTENBACHER ’Krampen bei Neuberg', Krampen is a small village west recognised that the Neuberg fauna was to be correlated of, and now included in the community of Neuberg, in with that of the Mucronatenkreide of north Germany the Miirz valley (Text-fig. 1). There are no natural out­ (1873, p. 129). crops, and all the material came from a single quarry, now GEYER (1889) recorded anew species of ’Desmoceras', in the garden of a private house at the western end of the finer-ribbed than ’D‘ mite (HAUER) from Neuberg, but village. the specimen has disappeared. The occurrence of ammonites at Neuberg was first not­ The most recent account of the Neuberg fauna is that ed by HAIDINGER (1846, p. 45). HAUER described a of BRINKMANN (1935, p. 5) who recorded fourteen spe­ giant ’Hamites1 (H. hampeanus) from this locality in 1847 cies, five of them pachydiscids, as well as an anomalous re­ (p. 75); in 1858 he recognised this as a synonym of Hami­ cord of the Cenomanian Forbesiceras largilliertianum tes cylindraceus DEFRANCE, 1816, and also described (D.ORBIGNY, 1841). Text-fig. 1. Locality map of the Neuberg area. ©Verein zur Förderung der Paläontologie am Institut für Paläontologie, Geozentrum Wien KENNEDY, W. J. & SUMMESBERGER, H., Cretaceous ammonites, Neuberg . 183 The section of Neuberg, Steiermark, 1 500: Campanian — Lower Maastrichtian transgression series 0) 9 Saghalinites wrighti C o Inoceramus co C 773 CO 0) 9 Baculites, Zoophycos öo 9 Hoploscaphites e o -w CO C CO 100 m, not to scale CU C o co -Ö c «i CO J2 CO £ O 0) 0) ■rt W s o bß C o CJ <u + micro-sample Text-fig. 2. The lithostratigraphic sequence of Neuberg, Steiermark. The top is exposed in the old quarry of Krampen. The lower part and the transgression surface are roadside seen in exposures W of the quarry. ©Verein zur Förderung der Paläontologie am Institut für Paläontologie, Geozentrum Wien 184 Beitr. Paläont. Österr., 12, Wien 1986 Latterly, REYMENT (1958, p. 32, pl. 11, fig. 1) to heteromorphs is the number of ribs in a distance equal reillustrated the Kolotype of Ammonites anaspastus, to the whorl height. placing it in Mesograudryderas SPATH, 1927, and referr­ ing it to the Maastrichtian with a query. This remains the only Neuberg ammonite to be adequately illustrated. SYSTEMATIC PALAEONTOLOGY Phylum MOLLUSCA; CLASS CEPHALOPODA LOCALITY DETAILS CUVIER, 1797 Order AMMONOIDEA ZITTEL, 1884, pp. 355, 392 The quarry at Krampen, although discused in HAUER’s Suborder PHYLLOCERATINA ARKELL, 1950, p. 355 day, is in remarkably good condition, still showing a 2 0 m Superfamily PHYLLOCERATACEAE ZITTEL, 1884, sequence of sediments. Neither upper nor lower bound­ p. 434 aries are visible, while the whole sequence has been Family PHYLLOCERATIDAE ZITTEL, 1884, p. 434 more-or-less tectonised. The succession consists of grey Subfamily PHYLLOCERATINAE ZITTEL, 1884, p. 434 siltstones with argillaceous intercalations, and is locally carbonaceous, comparing with the Tnoceramen-Schich- (= Hypophylloceratinae SPATH, 1927, p. 38; Calliphyllo- ten‘ of the Neue Welt basin to the north-east of Neuberg. ceratinae SPATH, 1927, p. 38) A detailed section is shown in Text-fig. 2. Collecting is now poor at Neuberg, although badly preserved bivalves (including Inoceramus), gastropods and Genu sPARTSCHICERAS FUCINI, 1920, p. 95 coral fragments occur. We feiled
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