File:Geology of the Richmond Basin 1899 Plate XLVIII.jpg

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Captions

Captions

Gullies in decomposed gneiss eroded by rains

Summary[edit]

Description
English: Plate XLVIII from The Geology of the Richmond Basin published by USGS, which has the following caption:
Gullies in decomposed gneiss eroded by rains, western border (of the Richmond Basin), near Mosley Junction, Chesterfield County.
The text of the report refers to the figure as follows:
The gneisses of the western border weather rather less readily than the coarse granites of the eastern margin, mainly because the gneiss contains more quartz. A part of these gneisses appears to be an ancient sheared quartz-porphyry, a group of rocks which resist weathering longer than granite. Notwithstanding this relative resistance to weathering, there are bauds of deeply decayed gneisses, and the rains have carved in these fields channels and miniature river systems imitative of bad-land sculpture. Such a piece of topography is shown in Pl. XLVIII, reproduced from a photograph taken from a point south of Mosley Junction.
Date
Source Nathaniel Southgate Shaler and Jay Backus Woodworth, 1899. Geology of the Richmond Basin, Virginia. U.S. Government Printing Office. United States Geological Survey.
Author USGS

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