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Journal of Micropalaeontology An open-access journal of The Micropalaeontological Society
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Volume 9, issue 2
J. Micropalaeontol., 9, 173–187, 1991
https://doi.org/10.1144/jm.9.2.173
© Author(s) 1991. This work is distributed under
the Creative Commons Attribution 4.0 License.
J. Micropalaeontol., 9, 173–187, 1991
https://doi.org/10.1144/jm.9.2.173
© Author(s) 1991. This work is distributed under
the Creative Commons Attribution 4.0 License.

  01 Mar 1991

01 Mar 1991

Nonpalaeocope ostracod biostratigraphy of the type Wenlock Series, Silurian, of the Welsh Borderland

Robert F. Lundin1., Lee E. Petersen2., and David J. Siveter3. Robert F. Lundin et al.
  • 1.Department of Geology, Arizona State University, Tempe, Arizona, U.S.A. 85287-1404
  • 2.Anadarko Petroleum Corporation, 16855 Northchase Dr., Houston, Texas, U.S.A. 77060
  • 3.Department of Geology, University of Leicester, University Road, Leicester, LE1 7RH, England

Abstract. Analysis of distribution, diversity and abundance of nonpalaeocope ostracods from the type Wenlock Series demonstrates that a major faunal change occurs around the Sheinwoodian-Homerian Stage boundary and that significant increases in faunal diversity occur at that boundary and in the late Whitwell Chronozone. Low abundance and low diversity in the late Sheinwoodian is interpreted to represent maximum water depth for the type Wenlock Series whereas the high diversity fauna of the late Homerian represents shallowest water conditions for this sequence. Many late Homerian species range into the Lower Elton Formation (early Ludlow) which suggests gradual ecostratigraphic change across the Wenlock-Ludlow boundary. Ancestor-descendant relationships for several lineages in the type Wenlock Series define lineage zones which essentially coincide with assemblage zones based on nonpalaeocope ostracods.

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