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Mats Eriksson

Mats Eriksson

Professor

Mats Eriksson

Upper Katian (Upper Ordovician) trans-Atlantic δ13C chemostratigraphy : the geochronological equivalence of the ELKHORN and PAROVEJA excursions and its implications

Författare

  • Stig M. Bergström
  • Mark Kleffner
  • Mats E. Eriksson

Summary, in English

Since 2010 when the North American ELKHORN and Baltoscandic PAROVEJA isotope excursions were first described and named, their mutual age relations have remained uncertain, if not controversial. This was at least partly due to the incompleteness of the ELKHORN excursion in its reference section in western Ohio. The unexpected discovery of an apparently complete ELKHORN excursion in a drill core from St Marys in western Ohio has led to the conclusion that in terms of stratigraphical position and δ13C curve correspondence, the ELKHORN and PAROVEJA excursions are so similar that they apparently represent the same isotopic curve perturbation. The ELKHORN/PAROVEJA excursion occurs in the D. pacificus Graptolite Zone and uppermost A. ordovicicus Conodont Zone in the uppermost Katian Stage (Stage Slice Ka4 of Bergström et al. Lethaia 42, 97–197, 2009). Because the designation PAROVEJA was published two months before that of ELKHORN, it has priority as excursion designation. This excursion is particularly well represented in the carbonate successions in the Great Basin of western United States. Chemostratigraphy and biostratigraphy in that region show that the Richmondian transgression was contemporaneous with the beginning of the middle Katian WHITEWATER/MOE excursion. The onset of the Richmondian transgression has long been controversial but now available evidence suggests that it is of essentially the same age across large regions of the southern, western and central United States.

Avdelning/ar

  • Berggrundsgeologi

Publiceringsår

2020-04

Språk

Engelska

Sidor

199-216

Publikation/Tidskrift/Serie

Lethaia

Volym

53

Issue

2

Dokumenttyp

Artikel i tidskrift

Förlag

Taylor & Francis

Ämne

  • Geology

Nyckelord

  • ELKHORN
  • PAROVEJA
  • Richmondian transgression
  • St. Marys
  • Upper Ordovician
  • δC chemostratigraphy

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0024-1164