sedimentary
Fossiliferous Limestone Pebble
Limestone with fossil inclusion
AI-generated identification · may be incorrectHardness: ~3 (calcite matrix), Color: gray, Luster: dull to earthy, Structure: massive fine-grained matrix with a visible fossil inclusion
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Physical properties
Hardness: ~3 (calcite matrix), Color: gray, Luster: dull to earthy, Structure: massive fine-grained matrix with a visible fossil inclusion
Formation & geological history
Formed in a marine environment from the accumulation of calcareous mud and biological remains. Later rounded into a pebble by water action.
Uses & applications
Educational, collecting, landscaping. Limestone itself is used widely in construction and cement.
Geological facts
The inclusion appears to be a small fossil, possibly a fragment of a shell, crinoid stem, or other marine invertebrate, preserved within the limestone matrix.
Field identification & locations
Identified by its reaction to weak acid (effervescence), relatively low hardness, and the presence of fossil inclusions. Common on beaches or in riverbeds where limestone bedrock is present.
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