Andrew Sherwood

The Geology of Potter County Andrew Sherwood

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. 1880. Excerpt: ... Chapter IX. Notes of a reconnoissance across the hills from Roulet to Sharon and back, made by Mr. Ashburner, and Mr. Carll, in 1877, for the purpose of comparing the conglomerates covering the hilltops in Potter and McKean. By Chas. A. Ashburner, Assistant in charge McKean, Elk, Cameron and Forest Counties. The weather was particularly favorable for barometric observations; and the elevations given below were determined by a Hicks aneroid, from Erie railroad grade at Port Allegheny as a datum=1482' above tide. Between Port Allegheny and Coudersport the levels were corrected by the profile of the Jersey Shore and Pine Creek railway. Section No. 1. The following section was made of the hill north of the river in warrant 2174, McKean County, between Coleman and Sartwell creeks: 2125 Summit of hill capped by soft greenish-gray flaggy sandstone, book leaf structure. 1975 to 1995 probably greenish argillaceous shale. Book-leaf structure. 1975 Terrace. 1855 Gray and reddish-gray sand flags containing iron specks. 1810 Line of springs and swamp grass. 1735 Terrace. 1535 Red shale, probably bottom of red measures. ( Between 1535 and 1735 strata passed over in all probability red shale.) These notes are taken from a letter addressed to Prof. Lesley, in December, 1877. More particular and special reference is made to the comparison between the Potter and McKean section in the report (R) on McKean County. 7GGG-. (97) 1510 In a cutting along the roadside the rock oonsists of 20 feet more or less of a soft greenish-grey and reddish-grey sand shale containing minute plants; underlaid by a hard massive greenish-grey sandstone 4 to 5 feet thick containing con-cretionary iron balls, scattered plant remains and broken imperfect fragments of fish. The total thickness of r...