Clam trace fossils on a fallen sandstone block of the Brushy Basin Member of the Jurassic-age Morrison Formation.
https://geology.utah.gov/wp-content/uploads/ugs-logo-large.png00Utah Geological Surveyhttps://geology.utah.gov/wp-content/uploads/ugs-logo-large.pngUtah Geological Survey2017-07-19 07:22:272017-07-19 07:22:27POTD July 19, 2017: San Rafael Swell, Emery County
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