Lower Silurian conodonts from the Shine Jinst region, southwestern Mongolia

Autor:	D. Jeffrey Over, Erika M. Danielsen
Rok vydání:	2016
Předmět:	010506 paleontology biology Carbonate platform Fauna Paleontology Pelagic zone 010502 geochemistry & geophysics biology.organism_classification 01 natural sciences Pollock chemistry.chemical_compound chemistry Carbonate Key (lock) Conodont Geology 0105 earth and related environmental sciences
Zdroj:	Journal of Paleontology. 90:78-91
ISSN:	1937-2337 0022-3360
DOI:	10.1017/jpa.2016.18
Popis:	Lower Silurian conodonts were recovered from carbonate beds in the upper Zalaa and lower Sharchuluut formations at Yamaan Us in the Shine Jinst region, Gobi-Altai Zone, of southwestern Mongolia. Conodonts are described from the Zalaa Formation for the first time; key taxa recovered includeDistomodus kentuckyensisBranson and Branson, 1947,Ozarkodina hassi(Pollock, Rexroad, and Nicoll, 1970), Pranognathus siluricus(Pollock, Rexroad, and Nicoll, 1970), andPseudolonchodina expansa(Armstrong, 1990). These species constrain the onset of the Silurian carbonate platform, upper Zalaa to lower Sharchuluut formations, to thePranognathus tenuisZone, middle Aeronian. The presence of a cosmopolitan conodont fauna places these strata from the Gobi-Altai Zone in a basin-shelf marine setting with connection and circulation to the open ocean during the Llandovery.
Databáze:	OpenAIRE
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