File:Zebra evaporites (Guilmette Formation, Upper Devonian; Bactrian Mountain East section, Mt. Irish Range, Nevada, USA).jpg

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English: Evaporites in the Devonian of Nevada, USA.

The whitish-colored rocks seen here are evaporites in the Guilmette Formation, which in this section is a heterolithic unit having carbonates, sandstones (now "quartzites") and evaporites. Well above this particular outcrop is the Frasnian-Famennian boundary (= the last two stages of the Devonian System) - it is constrained to a bedding plane within the Guilmette Formation. The Great Basin is the only place on Earth having this contact in a carbonate succession. The Frasnian-Famennian boundary is significant because it marks one of the five greatest mass extinctions of organisms in Earth history ("The Big Five" - not a sports nerd term).

Stratigraphy: upper member, Guilmette Formation, upper Frasnian Stage, lower Upper Devonian

Locality: Bactrian Mountain East section - eastern shoulder of "5230 peak" at Bactrian Mountain, Mt. Irish Range, ~between the towns of Rachel and Alamo, western Lincoln County, southern Nevada, USA (vicinity of 37° 31' 42.12" North latitude, 115° 19’ 37.25" West longitude)
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Source https://www.flickr.com/photos/47445767@N05/49667952383/
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@N05/49667952383. It was reviewed on 15 November 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

15 November 2020

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current11:48, 15 November 2020Thumbnail for version as of 11:48, 15 November 20201,280 × 960 (914 KB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/49667952383/ with UploadWizard

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