Sunday, December 4, 2011

Vinlandostrophia amonea from the Verulam formation

Following the theme of Vinlandostrophia species here is a Vinlandostrophia amonea from the Verulam formation of Ontario, Canada. The Verulam formation is upper Ordovician in age (Katian/Mohawkian stage) and is thus older than the rocks exposed around Cincinnati which are upper Ordovician (Katian to Hirnantian stage but locally referred to as the Richmondian stage).

This example is a single valve embedded within a grainstone type limestone. It has some resemblance to the species V. acutilirata that is found in the upper Ordovician age rocks around Cincinnati.

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