Prof John B Trasks Report On the Geology of the Sierra Nevada Or California
Prof John B Trasks Report On the Geology of the Sierra Nevada Or California
Geological Survey of California
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This district is strongly marked throughout its entire extent, and the transition either from the valley or mineral district proper is such as cannot fail to attract the attention of the most careless traveller in passing over it. It will recur to the mind of every one who has passed from the rivers to the interior, that at the distance of some twelve or fourteen miles from the streams, that you enter very suddenly a district thickly covered with annu- lar pebbles of quartz ; the district is sc...arcely less than two miles in width in any part of it, and in some localities much wider. On reaching the eastern verge of the valley, the transition is equally sudden as in the first instance ; the angular pebbles disappear, and a few round pebbles, mixed with alluvion, replace them, for a short distance, which is immediately suc- ceeded by the outcrop of what has been denominated the " gravestone " slate, from the appearance they present of a ruined churchyard, in nearly all the lower hills on the eastern edge of the valley.
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