On the surface geology of southwest Pennsylvania and adjoining portions of Maryland and West Virginia

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1878
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Abstract
THE following article contains a urief summary of the results obtained by me during three years' labor in connection with the Second Geological Survey oE Pennsylvania.The detailed statement will appear elsewhere.r:!.'he area in which observations were made covers in all more than 10,000 square miles.It embraces that portion of Pennsylvania lying south from the Ohio and Conemaugh Rivers and west from the Alleghanies; includes a large part of West Virginia and Maryland lying on both sides of the Alleghanies of Virginia; and has the channel-ways of foul' great rivers, the Monongahela, Cheat, Youghiogheny and Potomac, lying part1y within it.Along all the streams there are fine terra0,es covel'ed with detritus containing many polished fragments, which have been transported from a greater or less distance; these terraces fall down stream but not so rapidly as do the present stream-beds; and the ten'aces of tributaries are continuous with those of the main streams.A second series of benches appears throughout this whole region and seems to be characteristic of a much wider area than that in which observations were made.The benches of this series evidently differ in origin from those of the lower series; their detrital coating contains little clay, no transported fragments and consists almost wholly of sand.They are almost absolutely horizontal,' they do not merge into the lower series,
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openalex_W2327585246 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors John J. Stevenson
Journal american journal of science
Year 1878
DOI
10.2475/ajs.s3-15.88.245
URL
https://doi.org/10.2475/ajs.s3-15.88.245
Keywords Keywords not found

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