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fhopson: Ripple marks, north shore of Lake Tahoe.
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fhopson: Ripple marks, north shore of Lake Tahoe.
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fhopson: Ripple marks, Lake Tahoe
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fhopson: Cross-bedding
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fhopson: Cross bedding in the Permian Ten Sleep Sandstone
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fhopson: Cross-bedding in the lower Cambrian Prospect Mountain Quartzite
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fhopson: Cross-bedding, Madison Limestone
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fhopson: Cross-bedding in auriferous paleogravels at North Columbia Diggins, CA
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fhopson: Cross-bedding in auriferous paleogravels at North Columbia Diggins, CA
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fhopson: Cross beds in Jurassic Aztec Sandstone
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fhopson: Chert at Marin Headlands