County Report 67
	Geology and mineral resources of York County, Pennsylvania by Stose, G. W., and Jonas, A. I. 1939
Suggested Citation:	Stose, G. W., and Jonas, A. I., 1939, Geology and mineral resources of York County, Pennsylvania: Pennsylvania Geological Survey, 4th ser., County Report 67, 199 p. [Available online.]
Description:	A detailed, well-illustrated report on York County in south-central Pennsylvania that is divided into sections on geography, descriptive geology (including stratigraphy), geologic structure, geologic history, and mineral resources. The county contains rocks of Precambrian, Cambrian, Ordovician, and Triassic age. Significant mineral resources of York County include high-calcium limestone of the Kinzers Formation, roofing slate from the Peach Bottom Formation, clay (used for applications as diverse as bricks and whiting for paper), sand, gravel, building stone, and iron deposits. A significant structural feature is the Martic overthrust, whose surface trace crosses the county from its lower western edge to almost half way up its eastern edge. Fossils, including trilobites, plant fossils, and dinosaur footprints, are described and illustrated in the text. A 1:62,500-scale geologic map with several cross sections is part of the report.
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