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pelmatozoans

Earth and Environmental Science Transactions of The Royal Society of Edinburgh (1)

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The pelmatozoan fauna of the High Mains Formation (Ordovician: Hirnantian) of the Craighead Inlier, Strathclyde
S. K. Donovan, D. A. T. Harper
Journal:

Transactions of the Royal Society of Edinburgh: Earth Sciences / Volume 83 / Issue 4 / 1992

Published online by Cambridge University Press:

03 November 2011, pp. 669-677

Print publication:

1992
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Faunas of disarticulated ossicles, particularly columnals, are a potentially important source of data for helping to elucidate the patterns of evolution and extinction shown by pelmatozoans in the late Ordovician. The columnal fauna of the Hirnantian High Mains Formation, Craighead Inlier, Strathclyde, includes the following morphotaxa: Cyclocyclicus (col.) foraminosus sp. nov.; Cyclocyclicus (col.) periogmos sp. nov.; Hypsinomocrinus (col.) lewisi gen. et sp. nov.; Tetragonotetragonalis (col.) girvanensis sp. nov.; and Pentagonopentagonalis (col.) sp. This is the first Hirnantian columnal fauna to be described from the North American province; it is distinctly different from Hirnantian columnal biota described from Wales and Kazakhstan.