The Spathian-Anisian (Lower-Middle Triassic) Boundary in the candidate GSSP section at Deşli Caira, Romania

Author(s): Micha Horacek, Eugen Grădinaru
Abstract: The Deşli Caira section in Romania has been renowned for its ammonoid record for more than a century, recording the transition from the Lower Triassic (Spathian) to the Middle Triassic (Anisian), and for the last ca 20 years it has been a candidate GSSP for the Spathian-Anisian Boundary. We gather the existing data on this section, add a high-resolution δ¹³C curve, and correlate and compare the dataset with the records of other competing GSSP candidates. We show that there are turnovers of conodont, ammonoid and foraminifera species in the Deşli Caira section within the boundary interval, accompanied by a maximum in the δ¹³C curve and a distinctive pattern in the palaeomagnetic data. We also show that currently there exist two different levels for the Spathian-Anisian Boundary in the literature. In comparison with Deşli Caira the other candidate sections for the Spathian-Anisian Boundary (Kcira section, Albania; Wantou section, China) have smaller datasets, in that both are lacking a detailed ammonoid stratigraphy. Thus, Deşli Caira is the better suited section for hosting the GSSP, once the problem with the two boundary levels is solved by detailed description of the ammonoid record.
Organisation(s): Department of Lithospheric Research
External organisation(s): University of Bucharest
Journal: Palaeogeography, Palaeoclimatology, Palaeoecology
Volume: 613
ISSN: 0031-0182
DOI: https://doi.org/10.1016/j.palaeo.2023.111407
Publication date: 03-2023
Peer reviewed: Yes
Austrian Fields of Science 2012: 105105 Geochemistry
Keywords
ASJC Scopus subject areas: Oceanography, Ecology, Evolution, Behavior and Systematics, Earth-Surface Processes, Palaeontology
Portal url: https://ucrisportal.univie.ac.at/en/publications/cfc9b556-d887-4310-81e5-9abe9ea94d37

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