Middle Telychian (Llandovery, Silurian) graptolites and biostratigraphy of the Howgill Fells, England, based upon the collections of D.W.R. Wilson housed in the Lapworth Museum of Geology, University of Birmingham

Author:

Loydell David K.1ORCID

Affiliation:

1. School of the Environment, Geography and Geosciences, University of PortsmouthBurnaby Road, Portsmouth PO1 3QL, UK

Abstract

Examination of D.W.R. Wilson's PhD graptolite collection from the Howgill Fells, housed in the Lapworth Museum of Geology, University of Birmingham, reveals a high diversity (23 species) of middle Telychian graptolites from the uppermost Streptograptus crispus and Streptograptus sartorius (and possibly lowermost Monoclimacis griestoniensis) biozones. The collections include the first British records of Pseudoplegmatograptus hexagonalis and Pristiograptus pergratus. The stratigraphical range of P. pristinus is extended upwards, into the sartorius Biozone. One specimen of Stimulograptus clintonensis shows remarkable dorsal rhabdosome curvature proximally. Torquigraptus is particularly diverse in the sartorius Biozone with at least six species present: one new species, T. wilsoni, is described and two probable new species, one of which is very similar to the lower Telychian T. cavei, are left in open nomenclature.

Publisher

Geological Society of London

Subject

Geology

Reference42 articles.

1. Barrande, J. 1850. Graptolites de Bohême. Théophile Haase Fils, Prague, 74, 4 pls.

2. Llandoverian and Wenlockian graptolites from Bornholm;Bjerreskov;Fossils and Strata,1975

3. Retioliti středoevropského Llandovery a spodního Wenlocku;Bouček;Rozpravy II. Třídy České Akademie,1944

4. Bronn, H.G. 1835. Lethaea Geognostica. 1. Schweizerbart, Stuttgart.

5. A monograph of British graptolites. Part 7;Elles;Monograph of the Palaeontographical Society,1908

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