fossil
Sandstone with Brachiopod Mold Fossil
Sedimentary rock (Sandstone) with indeterminate Brachiopod mold
Hardness: 6-7 (Mohs scale); Color: Brown, tan, grey; Luster: Dull/Earthy; Crystal Structure: Clastic; Specific Gravity: 2.2-2.8; Surface: Gritty texture with a concave impression of a shell
- Hardness
- 6-7 (Mohs scale)
- Color
- Brown, tan, grey
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Brown, tan, grey; Luster: Dull/Earthy; Crystal Structure: Clastic; Specific Gravity: 2.2-2.8; Surface: Gritty texture with a concave impression of a shell
Formation & geological history
Formed through the lithification of sand-sized grains in a marine or river environment. The fossil impression was created when an ancient marine organism's shell was pressed into soft sediment and later dissolved, leaving a cast or mold. Ages typically range from Paleozoic to Mesozoic.
Uses & applications
Scientific study, educational specimens, garden decor, and casual collecting.
Geological facts
Sandstone fossils are common in regions that were once ancient sea beds. This specimen specifically shows a 'mold' fossil, which is a negative imprint of the original organic structure.
Field identification & locations
Identify by the grainy 'sandpaper' feel of the host rock and the distinct symmetrical indentation of a shell or organism. Common in regions with sedimentary bedrock like the Appalachians or the UK.
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