fossil
Brachiopod Fossil in Sedimentary Matrix
Phylum Brachiopoda in Siltstone/Mudstone matrix
Hardness: 3-4 (matrix), color: earthy tan to brown, luster: dull/earthy, features visible ribbing of shell impressions (costae), fine-grained clastic texture.
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Physical properties
Hardness: 3-4 (matrix), color: earthy tan to brown, luster: dull/earthy, features visible ribbing of shell impressions (costae), fine-grained clastic texture.
Formation & geological history
Formed during the Paleozoic era (approx. 250-500 million years ago) in a shallow marine environment where ancient shellfish were buried by sediment which later lithified into rock.
Uses & applications
Used primarily for scientific study (paleontology), educational purposes, and as collector specimens.
Geological facts
Brachiopods are often called 'lamp shells' because their shape resembles ancient oil lamps. Although they look like modern clams, they are biologically distinct and belong to a different phylum.
Field identification & locations
Identify in the field by looking for symmetrical 'butterfly' or 'fan' shapes with ribbed patterns in layered sedimentary rock outcrops, especially in limestone or siltstone beds.
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