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

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Summary

Description
English: Plate XX from The Geology of the Richmond Basin published by USGS, which has the following caption:
Gneiss of western border (of the Richmond Basin), showing joints and thrust plane, Three Chop Road. Looking north.
The text of the report refers to the figure:
The gneisses.—The extreme northern and southern ends of the Richmond basin are bordered by gneissic rocks, which are continuous along the western margin except for occasional dikes of granite interpolated in them. The gneiss appears to be largely igneous rock also, but in an altered condition from the effects of pressure and shearing. The most common type resembles quartz-porphyry, which has been extensively sheared, faulted, and jointed. Some of its secondary structures are shown in the accompanying reproduction of a photograph taken along the western border where streams have removed the weathered subsoil (see Pl. XX).
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

Gneiss of western border of the Richmond Basin, showing joints and thrust plane

Items portrayed in this file

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gneiss

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image/jpeg

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current16:04, 21 December 2022Thumbnail for version as of 16:04, 21 December 20222,384 × 1,524 (859 KB)JstubyUploaded a work by USGS from Nathaniel Southgate Shaler and Jay Backus Woodworth, 1899. Geology of the Richmond Basin, Virginia. U.S. Government Printing Office. United States Geological Survey. with UploadWizard

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