File:Dolerite ventifact (Antarctica) 1.jpg

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

Original file (2,239 × 1,686 pixels, file size: 2.85 MB, MIME type: image/jpeg)

Captions

Captions

Add a one-line explanation of what this file represents

Summary

[edit]
Description
English: Dolerite ventifact from Antarctica. (United States Polar Rock Repository collection, Byrd Polar Research Center, Ohio State University, Columbus, Ohio, USA)

Ventifacts are lustrous, polished rocks with subplanar to curved facets. They form by natural abrasion and polish by winds that carry sand grains. Ventifacts are naturally sand-blasted rocks.

The rock itself is dolerite, also known as diabase. It is the shallow intrusive equivalent of basalt. Specimen-wise, it is essentially identical to basalt - a mafic, aphanitic igneous rock composed of plagioclase feldspar and pyroxene.

Geologic unit: unrecorded/undisclosed, but almost certainly derived from the Ferrar Dolerite, Jurassic

Locality: unrecorded/undisclosed site in Antarctica (but very likely from the Dry Valleys west of McMurdo Sound, possibly Taylor Valley)
Date
Source https://www.flickr.com/photos/47445767@N05/49266288007/
Author James St. John

Licensing

[edit]
w:en:Creative Commons
attribution
This file is licensed under the Creative Commons Attribution 2.0 Generic license.
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/49266288007 (archive). It was reviewed on 24 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

24 December 2019

File history

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

Date/TimeThumbnailDimensionsUserComment
current03:15, 24 December 2019Thumbnail for version as of 03:15, 24 December 20192,239 × 1,686 (2.85 MB)Ser Amantio di Nicolao (talk | contribs)User created page with UploadWizard

You cannot overwrite this file.

There are no pages that 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:Dolerite_ventifact_(Antarctica)_1.jpg&oldid=878278602"