 | 1878 - 448 Seiten
...must once have flowed considerably more than 100 feet below its present level, and possibly more.than 200 feet below it. At least this is true of that portion...lower level than it does now ; for in the vicinity of New Brighton and Beaver Falls a massive sandstone is seen stretching across its bed, from bank to bank,... | |
 | Geological Survey of Pennsylvania - 1879 - 394 Seiten
...what is known of the ancient bed of the Big Beaver, the Ohio must once have flowed considerably over 100 feet below its present level, and possibly more...true of that portion of it below the mouth of the BigBeaver. To one hastily passing up the Big Beaver, it would seem that this stream could never have... | |
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Ohio river, and no rock foundation could be found for them at a depth of sixty feet below its present surface. No data have yet been obtained which can settle definitely the depth to which this buried channel extends, but from what is known of the ancient... 