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| | Description of the Geology of Mercer County Pennsylvania (Site not responding. Last check: 2007-10-13) |
 | | The Ferriferous limestone is 12 to 15 feet thick along Wolf creek, south of Pardue in Finley township it does not seem to exist, and the bore holes south of Stoneboro in Lake township did not find a trace of it. |
 | | The northern drift covers the entire county, even on the very summit of Keel ridge in Hickory township 1250` A.T. Bowlders of large size are often found in the drift; granite, gneiss, greenstone from New York or Canada, mixed with limestone, sandstone, shale, pieces of coal, and an abundance of bluish-white clay. |
 | | Under lie the Shenango shales and flagstone 45`; the Shenango sandstone (Sub-Olean flat pebble conglomerate of McKean county) with nodular iron ore and fish remains, 15`; and the Crawford shales, 90` of which are visible in the north-western corner of the county. |
| www.libraries.psu.edu /emsl/guides/X/mercer.htm (895 words) |
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