SILURIAN TRILOBITES FROM SOUTHWESTERN ALASKA

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 Par acybantyx occidentalis n. sp., Ligiscus smithi n. sp., Calymene s.l. a ff. C. iladon Lane and Siveter, 1991, Scotoharpes aff. S. raaschi Norf ord, 1973, Scharyia sp., a cheirurine belonging to either Radiurus Ram skold, 1983, or Protocerauroides Chatterton and Perry, 1984, and an un determined warburgelline. The fauna has close affinity to those descri bed from similar lithologies in the Telychian of North Greenland. Mach aeridians occurring with the trilobites include Turrilepas sp., Compac oleus sp., and Lepidocoleus cf. L. britannicus Withers, 1926.