Pierre J. Lespérance
Abstract
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Ashgillian brachiopods and trilobites, Llandoverian graptolites, comparison with USSR and Great Britain, low faunal diversity in Hirnantian, base of Hirnantian should be considered for Ordovician-Silurian boundary
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Ashgillian brachiopods and trilobites, Llandoverian graptolites, comparison with USSR and Great Britain, low faunal diversity in Hirnantian, base of Hirnantian should be considered for Ordovician-Silurian boundary
Key concepts: Ordovician, Paleontology, Geology, Fauna, Boundary (topology), Ecology, Biology, Mathematical analysis