Gray C. and Lapham D. M. 1961 GUIDE TO THE GEOLOGY OF CORNWALL PENNSYLVANIA Pennsylvania Geological Survey Bulletin G-35 8vo, in wraps as issued, discrete notation on wrap corner, ex-lib. copy, contents good with 18 pp., 2 plates, and map that describe the geology and minerals of this Triassic - Jurassic boundary age ore deposit, noted for its magnetite and related mineral species, and deposits more or less along the contact of the Gettysburg Triassic sedimentary basin with underlying lower Paleozoic (Cambrian) strata.  Hard to find. Buyer/highest bidder pays shipping, payments via Ebay preferred. Items shipped within 5 business days from receipt and clearance of payment, tracking will be posted. For more geology paleontology gold silver and other ore mining mineralogy and related geoscience and natural history books bulletins atlases and maps, please browse my other auctions.

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