The Ordovician carbonate hardground fragment pictured
here is dominated by a large trepostome bryozoan (Stigmatella).
To the left of the bryozoan are small round holes. These holes
are given the ichnogenus name Trypanites, and they are
typical of Paleozoic bioerosion. This specimen is from the Grant
Lake Limestone (Upper Ordovician) exposed near Washington, Kentucky.
(Return to Geological History of Bioerosion
page.)
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