File:USNM 35225 Trilobite hash beds (30485043572).jpg

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USNM_35225 and USNM_35227: Pictured are multiple trilobite fragments fossilized in the same rock. These are commonly known as hash beds. "Hash" is an indicator of a near-shore environment, where waves could have broken apart trilobite exoskeletons and molts then re-deposited them. These particular hash beds are composed of trilobites Idahoia wyomingensis (USNM 35225) and Wilbernia walcotti (USNM 35227). Both samples were collected during the early 1900's in the northern region of Yellowstone National Park, from an exposed section of the Upper Cambrian (~500 million years ago) Snowy Range Formation.

Collecting any natural resources, including rocks and fossils, is illegal in Yellowstone Photo by Megan Norr; March 2016; Catalog #20792d;

Original #USNM_35225
Date
Source USNM_35225 Trilobite hash beds
Author Yellowstone National Park

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Public domain This image or media file contains material based on a work of a National Park Service employee, created as part of that person's official duties. As a work of the U.S. federal government, such work is in the public domain in the United States. See the NPS website and NPS copyright policy for more information.


This image was originally posted to Flickr by YellowstoneNPS at https://flickr.com/photos/80223459@N05/30485043572. It was reviewed on 16 March 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the Public Domain Mark.

16 March 2020

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current01:07, 15 March 2020Thumbnail for version as of 01:07, 15 March 20201,535 × 1,466 (2.66 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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