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

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Summary

Description
English: Plate XLIX from The Geology of the Richmond Basin published by USGS, which has the following caption:
Weathered granitic blocks, eastern border (of the Richmond Basin), south of Gayton, Henrico County.
The text of the report refers to the figure as follows:
A striking feature of the eastern boundary of the Richmond area, where that is formed by the granitite previously described, is the occurrence of a narrow belt of land, next the Newark margin, more or less encumbered with granitic bowlders varying in size from cobbles up to rounded masses 10 feet or more in diameter (see Pl. XLIX). These weathered blocks, of the same lithological structure as the underlying rock where that can be seen, for some reason are singularly limited to the margin of the basin, or if they occur over the granite areas to the eastward seldom give rise to such large bowlders as those common along the line designated. In the present period of atmospheric decay the granites in the two fields have been exposed to like conditions. The belt of weathered blocks along the border of the Richmond Basin becomes thus in some way connected causally with that geologic feature.
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

Licensing

Public domain
This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code. Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
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Captions

Weathered granitic blocks, eastern border of the Richmond Basin

Items portrayed in this file

depicts

blockfield

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image/jpeg

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