State Library of Pennsylvania - County Histories

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  • Date = 1965

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A collection of Pennsylvania county, township and borough histories. Includes atlases and plat maps of the state, county, townships, cities, and boroughs.
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Stratigraphic studies of the Silurian rocks of Pennsylvania : part 2. subsurface maps of the silurian rocks of western pennsylva
Stratigraphic studies of the Silurian rocks of Pennsylvania : part 2. subsurface maps of the silurian rocks of western pennsylva
Geology, Stratigraphic -- Silurian ; Geology -- Pennsylvania ; Geology -- New York (State)
The Silurian rocks in the subsurface of the Pennsylvania part of the Appalachian Plateau province can be related to the outcropping Silurian rocks of the Valley and Ridge province and the Niagara Escarpment. In general, the boundaries and compositional character of all the Silurian rock units indicate the existence of a major basis axis during Silurian time which lay roughly parallel to the present structural trend of the Appalachians through central Pennsylvania.