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Silurian trilobites from southwestern Alaska

Published online by Cambridge University Press:  14 July 2015

Jonathan M. Adrain ,
Brian D. E. Chatterton  and
Robert B. Blodgett
Jonathan M. Adrain
Affiliation:
Department of Earth Sciences, University of Western Ontario, London, Ontario N6A 5B7, Canada
Brian D. E. Chatterton
Affiliation:
Department of Geology, University of Alberta, Edmonton, Alberta T6G 2E3, Canada
Robert B. Blodgett
Affiliation:
Branch of Paleontology and Stratigraphy, U.S. Geological Survey, Reston, Virginia 22092
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Abstract

The first Silurian trilobites to be described from Alaska are of late Llandovery (Telychian) age. They occur with original cuticle intact in a white biosparite. Seven species have been identified, including Paracybantyx occidentalis n. sp., Ligiscus smithi n. sp., Calymene s.l. aff. C. iladon Lane and Siveter, 1991, Scotoharpes aff. S. raaschi Norford, 1973, Scharyia sp., a cheirurine belonging to either Radiurus Ramsköld, 1983, or Protocerauroides Chatterton and Perry, 1984, and an undetermined warburgelline. The fauna has close affinity to those described from similar lithologies in the Telychian of North Greenland. Machaeridians occurring with the trilobites include Turrilepas sp., Compacoleus sp., and Lepidocoleus cf. L. britannicus Withers, 1926.

Type
Research Article
Information
Journal of Paleontology , Volume 69 , Issue 4 , July 1995 , pp. 723 - 736
Copyright
Copyright © The Paleontological Society 

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