fossil
Bivalve Fossil (Brachiopod or Scallop)
Class Bivalvia (or potentially Phylum Brachiopoda)
Hardness: 3-4 (calcite matrix), Color: Off-white to gray, Luster: Dull/Earthy, Structure: Fan-shaped radial ribbing on a calcareous shell impression.
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Physical properties
Hardness: 3-4 (calcite matrix), Color: Off-white to gray, Luster: Dull/Earthy, Structure: Fan-shaped radial ribbing on a calcareous shell impression.
Formation & geological history
Formed in marine sedimentary environments (limestone or shale). The organic shell was buried by sediment and eventually mineralized or left a cast/mold through the permineralization process, often dating from the Paleozoic to Mesozoic eras.
Uses & applications
Educational specimens, paleontological research, and common items for fossil collectors.
Geological facts
Shell fossils are among the most common because the calcium carbonate of the shell preserves much better than soft tissues. They provide critical data about ancient sea levels and water temperatures.
Field identification & locations
Identify by radial symmetry and ribbing emerging from a central hinge point. Commonly found in sedimentary outcrops, riverbeds, or limestone quarries. Use a brush to clean and check for carbonate fizzing with weak acid.
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