sedimentary

Fossiliferous Brachiopod in Shale

Brachiopoda (Phylum) preserved in Carbonaceous Shale

AI-generated identification · may be incorrect

Hardness: 3-5.5 (varies by fossilization and rock density). Color: Dark gray to black matrix with a cream or tan fossil. Luster: Dull/Earthy matrix with a waxy or pearly fossil surface. Structure: Fine-grained clastic matrix with a convex-concave shell shape.

Hardness: 3-5
Color: Dark gray to black matrix with a cream or tan fossil
Luster: Dull/Earthy matrix with a waxy or pearly fossil surface

Identified March 14, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed in low-energy marine environments through the accumulation of fine silt and clay particles (organic matter). This specimen likely dates from the Paleozoic era (approx. 250-500 million years ago) when brachiopods were the dominant seafloor organisms.

Uses & applications

Primarily used for educational study, amateur paleontological collecting, and as scientific indicators for geological mapping and relative dating (bio-stratigraphy).

Geological facts

Brachiopods are often called 'lamp shells' because they resemble ancient oil lamps. Despite looking like clams, they are biologically distinct and use a unique feeding organ called a lophophore.

Field identification & locations

Identify in the field by looking for 'valves' or shell impressions in dark, plate-like sedimentary rocks near ancient ocean basins. Common in the Appalachian Mountains, the UK, and central China. Collectors should look for symmetry along a midline of the shell.