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

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Summary

Description
English: Plate XXIX from The Geology of the Richmond Basin published by USGS, which has the following caption:
Crossbedding in horizontal Newark sandstones, north bank of James River near Tuckahoe. Looking north.
The text of the report refers to the figure as follows:
The coarse granitic sandstones in the central portion of the basin near the top of the Newark section and, as well, those lower down in the Turkey Branch section, described on page 479, exhibit marked cross bedding.
In a small branch of Bakers Creek, on Mr. J. H. Bailey's plantation, cross-bedded sandstones occur. The strata here dip very gently westward. The cross bedding seen on the west bank of the creek shows a lower set of cross beds apparently dipping south, and an upper set truncating the first and apparently dipping north. These dips are recorded as apparent, for the reason that the exposed section may not be at right angles to the true dip of those small fore-set beds. This inclination may well be somewhat divergent from a north and south line.
Again, in this section of nearly horizontal rocks on the north side of the James River, coarse cross-bedding structure occurs. The layers dip and thin out to parallelism with the underlying beds to the westward, indicating a current and stream setting in that direction (see Pl. XXIX).
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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Crossbedding in horizontal Newark sandstones

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sandstone

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