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

From Wikimedia Commons, the free media repository
Jump to navigation Jump to search

Original file ‎(2,376 × 1,552 pixels, file size: 975 KB, MIME type: image/jpeg)

Captions

Captions

Southern Railway cut near Midlothian showing disintegration of granite

Summary[edit]

Description
English: Plate XXI from The Geology of the Richmond Basin published by USGS, which has the following caption:
Disintegration of granitite on eastern border (of the Richmond Basin), in Southern Railway cut, near Midlothian. A similar condition of the rock preceded deposition in Newark time.
The text of the report refers indirectly to the figure:
THE BOSCABEL BEDS
Bowlder deposits, believed to be associated with the Newark rocks, are found at two points on the western margin, north of the James River. Heinrich reports their existence at the base of the formation, at Midlothian, on the eastern margin; but such deposits have not been discriminated at the surface in that district. It may be that the large granitic blocks left upon the granitic area at the border line by atmospheric decay form a part of this layer, but there is no proof to that effect.
The bowlder deposits along the western margin are best exposed at Boscabel Ferry, in a small area separated from the main basin at Manakin by the gneissic ridge of Cornwallis Hill. The deposit consists of subangular fragments of gneiss of various origins. While a few of the fragments are rounded, others show almost unabraded joint faces. Flat blocks 3 feet long and 2 feet wide, and even 4 feet long, occur in pell-mell disorder, with a partial bedding of reddish gritty sandstone.
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[edit]

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.
This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights.

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current17:10, 22 December 2022Thumbnail for version as of 17:10, 22 December 20222,376 × 1,552 (975 KB)Jstuby (talk | contribs)larger image, remove color bands
15:32, 21 December 2022Thumbnail for version as of 15:32, 21 December 20221,138 × 730 (448 KB)Jstuby (talk | contribs)Uploaded 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

You cannot overwrite this file.

The following page uses this file:

File usage on other wikis

The following other wikis use this file:

Metadata

This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.

Retrieved from "https://commons.wikimedia.org/w/index.php?title=File:Geology_of_the_Richmond_Basin_1899_Plate_XXI.jpg&oldid=778624497"