Trilobite collecting in Colorado Rockies - Ordivician (Manitou Dolomite) - 2/1/2003

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Bottom of slabs commonly have this "popcorn" structure believed to be is caused by evaporation/rehydration of salts, possibly algal activity too.
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Bottom of slabs commonly have this "popcorn" structure believed to be is caused by evaporation/rehydration of salts, possibly algal activity too.