sedimentary
Fossiliferous Limestone
Calcareous biomicrite / Bioclastic limestone
Hardness: 3-4 (Mohs); Color: Tan, buff, cream, to yellowish; Luster: Dull/Earthy; Structure: Clastic or bio-clastic texture containing shells; Composition: Primary calcite (CaCO3).
- Hardness
- 3-4 (Mohs)
- Color
- Tan, buff, cream, to yellowish
- Luster
- Dull/Earthy
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Physical properties
Hardness: 3-4 (Mohs); Color: Tan, buff, cream, to yellowish; Luster: Dull/Earthy; Structure: Clastic or bio-clastic texture containing shells; Composition: Primary calcite (CaCO3).
Formation & geological history
Formed in marine environments through the accumulation of shell, coral, and algal debris. These sediments are lithified over millions of years through compaction and cementation. Often associated with Cretaceous to Cenozoic periods.
Uses & applications
Used primarily in construction for aggregate, building stone, cement production, and as an ornamental stone. Significant for paleontological study.
Geological facts
This rock can act as a natural record of past marine life. Some types, like Coquina, are composed almost entirely of shells. It is a major reservoir for groundwater and hydrocarbons.
Field identification & locations
Identify in the field by checking for fossil inclusions (shells, crinoids, etc.) and testing with a drop of cold dilute hydrochloric acid; it will vigorously effervesce (fizz). Found worldwide in places that were once ancient seabeds.
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