File:Unshocked gneiss (Eocene, 39 Ma; Haughton Impact Structure, Devon Island, northern Canada) 3 (16247177143).jpg

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Unshocked Precambrian gneiss from an Eocene impact crater in Canada. (9.8 centimeters across at its widest) (Centre for Planetary Science and Exploration collection, London, Ontario, Canada)

The Eocene-aged (39 Ma) Haughton Impact Structure is located on Devon Island in northern Canada. The target rocks were Middle and Lower Paleozoic sedimentary rocks, floored by Precambrian metamorphic rocks. Clasts of these surface and subsurface target rocks occur in abundance at the Haughton Structure, eroding from impact breccias. Shattercones also occur, sometimes in sufficient abundance to trip over them.

The rock shown above is a gneiss from the Precambrian metamorphic basement rocks on Devon Island. Basement rocks here are in the deep subsurface, but were excavated by the Haughton Impact event. As expected, many of the gneiss samples at the Haughton Impact Structure are impact shocked (see elsewhere in this photo album), but this unusual specimen escaped shock alteration.
Date
Source Unshocked gneiss (Eocene, 39 Ma; Haughton Impact Structure, Devon Island, northern Canada) 3
Author James St. John

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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/16247177143. It was reviewed on 2 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

2 December 2019

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Date/TimeThumbnailDimensionsUserComment
current06:18, 2 December 2019Thumbnail for version as of 06:18, 2 December 20193,130 × 2,314 (3.03 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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