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marjum formation

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

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Protaspid ontogeny of Bolaspidella housensis (Order Ptychopariida, Class Trilobita), and other similar Cambrian protaspides
Dong-Chan Lee, Brian D. E. Chatterton
Journal:

Transactions of the Royal Society of Edinburgh: Earth Sciences / Volume 96 / Issue 1 / March 2005

Published online by Cambridge University Press:

26 July 2007, pp. 21-41

Print publication:

March 2005
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The protaspid ontogeny of Bolaspidella housensis (Walcott, 1886) is re-described. This species is known from the Marjum Formation (Lower Marjuman Stage) of western Utah, USA. Three protaspid stages are recognised, with the instars discriminated most readily by different spacing between the postero-lateral ends of the fixigena. Protaspides of B. housensis are shown to be similar to those of Glaphyraspis parva, from several Upper Cambrian localities in the USA, and Ptychopariide sp. E from the Upper Cambrian of the Wasatch Mountains in Utah, USA.