Silurian trilobites from arctic Canada

• Published in: Geological Magazine
• Main Authors: Thomas, A. T., Narbonne, G. M.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Cambridge University Press (CUP) 1979
• Subjects: Geology; Arctic; Canada; Cornwallis; Read Bay; Cornwallis Island
• Online Access: http://dx.doi.org/10.1017/s0016756800041960; https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0016756800041960

Summary Trilobites of upper Ludlow age are described from Member A of the Read Bay Formation on Cornwallis Island. Four new species are represented: Helokybe spio gen. et sp.nov. (Dechenellinae), Encrinurus hyperboreus sp. nov., Kailia? capra sp.nov. (Encrinurinae) and Hemiarges echinatus sp.nov. Other taxa present are: an effaced scutelluid; Cyphaspis sp.; a warburgelline; two more encrinurids; two other forms of Hemiarges . The trilobites occur in sediments indicative of a shallow subtidal environment, with the exception of the warburgelline which occurs in sediments deposited under deeper subtidal conditions below storm wave-base.