fossil
Fossiliferous Limestone
Sedimentary Limestone (CaCO3) containing Crinoid or Brachiopod remains
Hardness: 3 (Mohs scale); Color: Light grey to tan; Luster: Dull/Earthy; Crystal structure: Microcrystalline calcite matrix; Exhibits visible fossil imprints and bioturbation marks.
- Hardness
- 3 (Mohs scale)
- Color
- Light grey to tan
- Luster
- Dull/Earthy
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Physical properties
Hardness: 3 (Mohs scale); Color: Light grey to tan; Luster: Dull/Earthy; Crystal structure: Microcrystalline calcite matrix; Exhibits visible fossil imprints and bioturbation marks.
Formation & geological history
Formed in warm, shallow marine environments through the accumulation of calcium carbonate and organic debris. This specimen displays evidence of marine life from the Paleozoic or Mesozoic eras.
Uses & applications
Primary use in construction (crushed stone, cement), agriculture (lime), and as a decorative specimen for amateur fossil collectors.
Geological facts
Limestone covers about 10% of the Earth's total land surface. Small cylindrical pits or elongated indentations in the surface often represent the calcified stems of crinoids, also known as 'sea lilies'.
Field identification & locations
Identify by a dull texture that reacts with weak acids (fizzing). Often found in riverbeds, quarries, and coastal cliffs. Look for symmetrical imprints or hollow tubes on weathered surfaces.
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