fossil
Fossiliferous Limestone
Fossiliferous Limestone (CaCO3 with organic inclusions)
Hardness: 3-4 (Mohs scale); Color: buff, tan, or grey; Luster: dull to earthy; Texture: clastic/bioclastic with visible shell fragments and imprints.
- Hardness
- 3-4 (Mohs scale)
- Color
- buff, tan, or grey
- Luster
- dull to earthy
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Physical properties
Hardness: 3-4 (Mohs scale); Color: buff, tan, or grey; Luster: dull to earthy; Texture: clastic/bioclastic with visible shell fragments and imprints.
Formation & geological history
Formed in warm, shallow marine environments from the accumulation of calcium carbonate and the skeletal remains of marine organisms like brachiopods and mollusks over millions of years.
Uses & applications
Used primarily in construction as building stone, gravel, and in the production of cement. Larger slabs with clear fossils are used for decorative architecture or as educational specimens.
Geological facts
These rocks represent ancient seabeds; the fossils within can be used to date the geological layer and provide information about the paleoecology of the region during the time of deposition.
Field identification & locations
Identify by looking for visible shell impressions or skeletal fragments in a fine-grained matrix that fizzes when exposed to weak acid (diluted HCl). Commonly found in sedimentary basins worldwide.
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