sedimentary
Fossiliferous Limestone
Fossiliferous Limestone (CaCO3)
Hardness: 3 (Mohs scale); Color: Tan, beige, or gray; Luster: Dull/earthy; Structure: Clastic or organic; Cleavage: None; Specific Gravity: 2.3–2.7
- Hardness
- 3 (Mohs scale)
- Color
- Tan, beige, or gray
- Luster
- Dull/earthy
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Physical properties
Hardness: 3 (Mohs scale); Color: Tan, beige, or gray; Luster: Dull/earthy; Structure: Clastic or organic; Cleavage: None; Specific Gravity: 2.3–2.7
Formation & geological history
Formed in marine environments from the accumulation of calcium carbonate and organic remains (shells and coral). This specimen likely dates from the Paleozoic or Mesozoic era.
Uses & applications
Used in construction, cement production, architectural stone, and as a soil conditioner in agriculture.
Geological facts
This rock acts as a natural record of prehistoric oceans. It contains 'trace fossils' or mold/cast impressions of ancient marine life like brachiopods or crinoids.
Field identification & locations
Identify in the field by looking for visible shell fragments or pits where fossils once were; it will also bubble (effervesce) if it comes into contact with dilute hydrochloric acid.
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