State Library of Pennsylvania - Pennsylvania Conservation and Science

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  • Date = 1965

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Items related to the care, management and supervision of natural resources in order to preserve and protect them through prudent management. General and specific topical texts in the natural and industrial sciences, such as paleontology and engineering.
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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.