Bulletin - United States Geological Survey No. 640
Bulletin - United States Geological Survey No. 640
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The only topographic evidence in favor of this change is the broad valley of Big Pine Gulch, which extends from Manhattan to Pipe Spring, in the southeast corner of the area shown on the Manhattan map.
At a point about 1^ miles southeast of Manhattan and a mile west of Pipe Spring there is a low divide east of which the drainage goes eastward. At Pipe Spring the course of the stream changes sharply and turns southward through a steep canyon of granite and meta- morphic sediments. South of the B...elmont road is another low divide between the drainage of Manhattan and East Manhattan gulches, but there is nothing in the present topography to indicate stream capture. The lower gravels show an excess of pebbles derived from the sediments over those from the rhyolites, a relation which is reversed nearer the surface, and this change in the character of the gravels, together with the presence, of well-rounded granite pebbles in the lower gravels, lends probability to the hypothesis that the stream formerly had a greater extension in the region covered by the granite and older sediments.
What to read after Bulletin - United States Geological Survey No. 640?
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To quickly assess the difficulty of the text, read a short excerpt:
The only topographic evidence in favor of this change is the broad valley of Big Pine Gulch, which extends from Manhattan to Pipe Spring, in the southeast corner of the area shown on the Manhattan map.
At a point about 1^ miles southeast of Manhattan and a mile west of Pipe Spring there is a low divide east of which the drainage goes eastward. At Pipe Spring the course of the stream changes sharply and turns southward through a steep canyon of granite and meta- morphic sediments. South of the B...elmont road is another low divide between the drainage of Manhattan and East Manhattan gulches, but there is nothing in the present topography to indicate stream capture. The lower gravels show an excess of pebbles derived from the sediments over those from the rhyolites, a relation which is reversed nearer the surface, and this change in the character of the gravels, together with the presence, of well-rounded granite pebbles in the lower gravels, lends probability to the hypothesis that the stream formerly had a greater extension in the region covered by the granite and older sediments.
What to read after Bulletin - United States Geological Survey No. 640?
You can find similar books in the "Read Also" column, or choose other free books by Geological Survey Us to read onlineMoreLess
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