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Paläontologische Zeitschrift

, Volume 89, Issue 3, pp 399–433 | Cite as

The Carnian/Norian boundary succession at Berlin-Ichthyosaur State Park (Upper Triassic, central Nevada, USA)

  • Marco Balini
  • James F. Jenks
  • Riccardo Martin
  • Christopher A. McRoberts
  • Michael J. Orchard
  • Norman J. Silberling
Research Paper

Abstract

The Upper Carnian-Lower Norian (Upper Triassic) Luning Formation at Berlin-Ichthyosaur State Park (BISP) in central NV (USA) has been sampled using for the first time the bed-by-bed approach for ammonoids, pelagic bivalves, and conodonts, more than 60 years after its first description by Silberling (U.S. Geological Survey Professional Paper 322: 1–63, 1959). BISP is historically important for the definition of the uppermost Carnian of the North American Triassic chronostratigraphic scale and is known worldwide as one of the most important ichthyosaur Fossil-Lagerstätte because of its extraordinary record of 37 articulated, large-sized specimens of Shonisaurus popularis. Nearly 190 ammonoids were collected from two stratigraphic sections, documenting all the latest Carnian to Early Norian ammonoid faunas previously described by Silberling. Halobiids were collected from five levels, and the first report of conodonts from BISP includes faunas from 13 levels. The ~340-m thick Brick Pile section, the most complete in the study area, includes the uppermost Carnian Macrolobatus Zone, which provides conodont faunas of the lower primitia zone and Halobia septentrionalis. The 200-m thick lowermost Norian Kerri Zone, which begins 52 m above the Macrolobatus Zone, yields conodonts of the upper primitia zone in its lower part, together with H. cf. beyrichi and H. cf. selwyni. The ichthyosaur-bearing interval, whose stratigraphic position has been interpreted quite differently by previous authors, is documented in the uppermost Carnian Macrolobatus Zone and is characterized by rich Tropites-dominated ammonoid faunas and by the onset of Halobia. All models proposed by various workers to explain the unusual ichthyosaur record are discussed and an additional explanation for the main ichthyosaur-bearing bed is proposed. The new hypothesis is that a harmful algal bloom (HAB) may have been the trigger for the mass mortality recorded in this level. Although the C/N boundary in the Brick Pile section lies within a 52 m interval that presently lacks paleontologic data, this succession is included in a small group of sections that are expected to contribute to the definition of the GSSP of the Norian stage. Correlation of the Brick Pile section with the best Carnian/Norian sections in northeastern British Columbia is discussed. Compared to the British Columbia Juvavites Cove and the GSSP candidate Black Bear Ridge sections, the Brick Pile section exhibits an ammonoid and Halobia record that is slightly more similar to that of the Tethyan sections. Correlation of the Brick Pile section with the second GSSP candidate Pizzo Mondello (Sicily, Italy) well demonstrates the significant problems encountered in calibration of the Tethyan and North American scales.

Keywords

Upper Triassic Fossil-Lagerstätte Nevada Ammonoids Halobia Conodonts Ichthyosaurs Mass mortality Chronostratigraphy 

Kurzfassung

Die oberkarnische bis unternorische (Späte Trias) Luning Formation im Berlin-Ichthyosaur State Park (BISP) in Zentral-Nevada (USA) wurde mehr als 60 Jahre nach der ersten Beschreibung durch Silberling (U. S. Geological Survey Professional Paper 322: 1–63, 1959) erstmals bankweise auf Ammoniten, pelagische Bivalven und Conodonten untersucht. Der BISP ist von historischer Bedeutung für die Definition des obersten Karn in der chronostratigraphischen Tabelle der nordamerikanischen Trias und ist eine der weltweit bekanntesten Ichthyosaurier Fossillagerstätten, ausgezeichnet durch den außergewöhnlichen Fund von 37 artikulierten, großen Exemplaren von Shonisaurus popularis. Nahezu 190 Ammoniten aus zwei stratigraphischen Abschnitten belegen oberstes Karn bis Unternor, wie schon früher durch Silberling beschrieben. Halobiiden liegen aus fünf Niveaus vor, und der Erstnachweis von Conodonten im BISP beinhaltet Faunen aus 13 Niveaus. Der ca. 340 m mächtige Brick Pile Aufschluss ist der kompletteste im untersuchten Gebiet. Er schließt die rund 20 m mächtige Macrolobatus Zone des obersten Karn mit Conodonten-Faunen aus der unteren primitia zone und Halobia septentrionalis ein. Nach einer Lücke im Fossilbefund von 52 m folgt die 200 m mächtige Kerri Zone des untersten Nor, welche im unteren Teil Conodonten der oberen primitia zone gemeinsam mit H. cf. beyrichi und H. cf. selwyni erbrachte. Das Ichthyosaurier führende Intervall, von bisherigen Autoren teils ins Karn und/oder ins Nor eingestuft, ist durch eine ergiebige Tropites-Fauna und das Einsetzen von Halobia charakterisiert und kann damit in das obere Karn eingestuft werden. Alle Modelle, die von verschiedenen Autoren für die Erklärung des außergewöhnlichen Ichthyosaurier-Vorkommens vorgeschlagen wurden, werden diskutiert und um ein zusätzliches Genesemodell für die Haupt-Ichthyosaurier-Bank erweitert. Nach der neuen Hypothese führte wohl eine schädliche Algenblüte zu einem Massensterben in diesem Horizont. Obwohl die Karn/Nor Grenze des Brick Pile Aufschlusses im Bereich des fossilleeren 52-m-Intervalls liegt, wird er zu der kleinen Gruppe von Profilen gezählt, welche wesentlich zur Definition des GSSP der Norischen Stufe beitragen können. Die Korrelation von Brick Pile mit den wichtigsten Karn/Nor-Grenzprofilen von British Columbia und Sizilien wird diskutiert. Verglichen mit Juvavites Cove und dem GSSP-Kanditaten Black Bear Ridge in B.C., weist Brick Pile bei den Ammonoideen und Halobien einen etwas stärkeren Tethys-Bezug auf. Ein Vergleich von Brick Pile mit dem zweiten GSSP-Kandidaten Pizzo Mondello (Sizilien, Italien) zeigt die signifikanten Probleme, welche bei der Korrelation tethyaler und nordamerikanischer Biochronologien auftreten.

Schlüsselwörter

Späte Trias Fossillagerstätte Nevada Ammonoideen Halobia Conodonten Ichthyosaurier Massensterben Chronostratigraphie 

Notes

Acknowledgments

We kindly thank the Nevada Division of State Parks and Nevada State Museum personnel who were responsible for expediting approval of our special permit application for paleontologic work within BISP. Their efforts are greatly appreciated. Likewise, we are appreciative of the US Forest Service for allowing us to conduct reconnaissance work on Toyable National Forest land. The on-site assistance of BISP supervisor Jeff Morris and his staff during our very rainy October 2010 field trip was also greatly appreciated.

Ammonoid taxonomic problems were discussed with Leo Krystyn (University of Vienna, Austria), who is the acknowledged leading authority on Carnian-Norian ammonoid systematics and biostratigraphy. Many thanks to Hans Hagdorn (Ingelfingen) for the stimulating discussions on concept and definition of mass mortality and Fossil-Lagestatten. Spencer G. Lucas and Justin A. Spielmann (New Mexico Museum of Natural History and Science, Albuquerque, NM) kindly helped with registration of the published specimens in the catalogue of the NMMNHS. Warm thanks also to Alexander Lukeneder (Naturhistorisches Museum, Wien), Hans Hagdorn and Leo Krystyn who kindly translated the Abstract into German.

The manuscript has been notably improved by valuable and stimulating suggestions by Leo Krystyn and Spencer G. Lucas.

Technical support for the ammonoid part was provided by G. Chiodi (University of Milano). This work is a contribution to PRIN 2008 project “Stratigrafia integrata del Triassico Superiore: GSSP e sezioni ausiliarie in Italia” (P.I. M. Balini). Financial support for field works has been provided by PRIN 2008 grants to M. Balini (Milano Research Unit). The conodont analyses were undertaken in Vancouver as a contribution to the Geological Survey of Canada’s “Geoscience for Energy and Minerals” (GEM) program, with support from the Yukon Basins Project (M.J. Orchard).

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Copyright information

© Paläontologische Gesellschaft 2014

Authors and Affiliations

  • Marco Balini
    • 1
  • James F. Jenks
    • 2
  • Riccardo Martin
    • 1
  • Christopher A. McRoberts
    • 3
  • Michael J. Orchard
    • 4
  • Norman J. Silberling
    • 5
  1. 1.Dipartimento di Scienze della Terra “Ardito Desio”University of MilanoMilanoItaly
  2. 2.West JordanUSA
  3. 3.Geology DepartmentState University of New York at CortlandCortlandUSA
  4. 4.Natural Resources Canada-Geological Survey of CanadaVancouverCanada
  5. 5.US Geological SurveyMenlo ParkUSA

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