sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Biogenic Fragments
Hardness: 3 on Mohs scale; Color: Grey, tan, buff, and light brown; Luster: Dull, earthy; Texture: Fine-grained matrix containing tiny fossil fragments such as crinoid stems, shell bits, or bryozoans.
- Hardness
- 3 on Mohs scale
- Color
- Grey, tan, buff, and light brown
- Luster
- Dull, earthy
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Physical properties
Hardness: 3 on Mohs scale; Color: Grey, tan, buff, and light brown; Luster: Dull, earthy; Texture: Fine-grained matrix containing tiny fossil fragments such as crinoid stems, shell bits, or bryozoans.
Formation & geological history
Formed in shallow, warm marine environments where biological debris like shells and skeletal fragments accumulated on the seafloor and underwent compaction and cementation over millions of years.
Uses & applications
Used in construction, lime production, aggregate, cement manufacturing, and popular as geological specimens and educational samples.
Geological facts
Fossiliferous limestone provides key evidence of ancient ocean conditions, shallow marine ecosystems, and past climate changes. Many major mountain ranges contain limestone pushed up from ancient ocean floors.
Field identification & locations
Identify by its reaction (fizzing) with dilute acid (HCl), softness compared to quartz, presence of small fossil impressions or rings, and earthy grey-tan coloration. Commonly found in riverbeds, limestone quarries, and sedimentary rock formations worldwide.
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