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concretion - cannonball concretion from the lower sandstone member of the Monterey Formation - hand specimen
$ 7.50
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concretion - cannonball concretion from the lower sandstone member of the Monterey Formation - hand/display specimen
$ 9.50
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concretion - cannonball concretion from the lower sandstone member of the Monterey Formation - large display specimen
$ 30.00
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diatomite - hand/display specimen of lacustrine diatomite from Mineral County, Nevada
$ 9.50
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mudcracks in siltstone from the Timpoweap Member of the Moenkopi Formation
$ 20.00
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