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Journal of Micropalaeontology

J. Micropalaeontol.

2041-4978

GSL Publishing

Göttingen, Germany

10.1144/jm.15.1.69

Lithofacies-influenced ostracod associations in the middle Ordovician Bromide Formation, Oklahoma, USA

Williams

Mark

Siveter

David J.

Department of Geology, University of Leicester, Leicester LE1 7RH, UK

01 04 1996

15 1 69 81

1996

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The Bromide Formation of southern Oklahoma was deposited in a linear basin and on the adjoining platform during a marine transgressive-regressive event in the middle Ordovician. The formation displays wide lateral (platform-basin) and vertical (transgressive-regressive) sedimentary facies variation. From the prolific and diverse ostracod fauna present in the Bromide Formation two lithofaeies-related ostracod associations can be defined: a geographically and stratigraphically widespread <i>Anisocyamus</i> Association, occupying subtidally deposited marine sediments: and a <i>Leperditella</i> Association, which is restricted to marginal marine environments. The ostracods of the Bromide Formation demonstrate that the group can be utilized in the Ordovician as a tool to help establish palaeoenvironments and differentiate palaeoshoreline.

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