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upper silurian
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View An Outline of the Geology of Canada: Based on a Subdivision of the Provinces ... By Edward John Chapman ,Chapman,E. J . (Edward John),1821 -1904,Copp Clark Company 
An Outline of the Geology of Canada: Based on a Subdivision of the Provinces ...
By Edward John Chapman ,Chapman,E. J . (Edward John),1821 -1904,Copp Clark Company
View Bibliography of North American Invertebrate Paleontology: Being a Report Upon the Publications ... By Charles Abiathar White,Henry Alleyne Nicholson 
Bibliography of North American Invertebrate Paleontology: Being a Report Upon the Publications ...
By Charles Abiathar White,Henry Alleyne Nicholson