This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1913 Excerpt: ... feet thick. The conditions were the same throughout the whole period of deposit, for variations in the upper half are similar to those in the lower half. Apparently there was slower subsidence along the western border than elsewhere, but no proof of overlapping or of regression can be found, as the outcrop is usually ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1913 Excerpt: ... feet thick. The conditions were the same throughout the whole period of deposit, for variations in the upper half are similar to those in the lower half. Apparently there was slower subsidence along the western border than elsewhere, but no proof of overlapping or of regression can be found, as the outcrop is usually at a considerable.distance from the border of deposit. There was a singular uniformity of conditions from north to south along the middle line.of the bituminous area, a distance of more than 200 miles. At the most northerly outcrop in Pennsylvania.. the thickness is approximately 600 feet and thence southward along the whole line it varies from 575 to 600 feet. Beyond Doddridge county of West Virginia, .definite measurements cannot be made as coal beds and limestones alike have disappeared; but at Huntingdon, 100 miles beyond, and just west from the middle line the thickness is said to be 660 feet. At the extreme southeastern outcrop in West Virginia, the interval "has been reported as 800 feet but some doubt remains as to the upper limit. Conditions during the Athens resembled those during the Pottsville, in that the trough of sedimentation with greater subsidence still existed at the east. But there was no longer differential subsidence toward the south and there is much reason for believing that there was notable contraction of the area of deposition in that direction, so that the Conemaugh may have extended, .at most, only a short distance into Tennessee.11 But when one reaches the Wheeling he finds a notable change. Going eastward from the western outcrop in Ohio, the thickness of the Monongahela is 206, 250 and at the Ohio River 261 feet. Beyond that river, 275, 300, 340 and 380 in Pennsylvania to just beyond the Monogahela River; 316...
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