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Lower Silurian conodonts from the Shine Jinst region, southwestern Mongolia

Published online by Cambridge University Press:  15 June 2016

Erika M. Danielsen
Affiliation:
Department of Geological Sciences, State University of New York College at Geneseo, Geneseo, New York 14454, USA 〈edanielsen027@gmail.com〉, 〈over@geneseo.edu〉
D. Jeffrey Over
Affiliation:
Department of Geological Sciences, State University of New York College at Geneseo, Geneseo, New York 14454, USA 〈edanielsen027@gmail.com〉, 〈over@geneseo.edu〉
Corresponding

Abstract

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 include Distomodus kentuckyensis Branson and Branson, 1947, Ozarkodina hassi (Pollock, Rexroad, and Nicoll, 1970), Pranognathus siluricus (Pollock, Rexroad, and Nicoll, 1970), and Pseudolonchodina expansa (Armstrong, 1990). These species constrain the onset of the Silurian carbonate platform, upper Zalaa to lower Sharchuluut formations, to the Pranognathus tenuis Zone, 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.

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Copyright © 2016, The Paleontological Society 

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