sedimentary
Fossiliferous Limestone
Limestone with fossil bioclasts (Calcium Carbonate, CaCO3)
Hardness: 3-4 (Mohs scale); Color: Gray to buff matrix with lighter cream-colored fossils; Luster: Dull to earthy; Structure: Fine-grained clastic matrix with visible shell fragments
- Hardness
- 3-4 (Mohs scale)
- Color
- Gray to buff matrix with lighter cream-colored fossils
- Luster
- Dull to earthy
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Physical properties
Hardness: 3-4 (Mohs scale); Color: Gray to buff matrix with lighter cream-colored fossils; Luster: Dull to earthy; Structure: Fine-grained clastic matrix with visible shell fragments
Formation & geological history
Formed in shallow, calm, warm marine waters from the accumulation of shell, coral, algal, and fecal debris. These fossils typically date from the Paleozoic or Mesozoic eras.
Uses & applications
Used primarily in construction (crushed stone, cement), as a soil conditioner in agriculture, and for decorative use in rock gardens. Small fossil specimens are popular for educational purposes.
Geological facts
The white patterns in this rock are fossilized remains, likely brachiopods, bivalves, or crinoids. Over 10% of all sedimentary rocks on Earth are limestones.
Field identification & locations
Identified by the presence of visible fossil remains in a soft, gray matrix that will react (fizz) when exposed to a weak acid like vinegar. Commonly found in former seabed locations and riverbeds.
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