sedimentary
Fossiliferous Limestone
Limestone (Calcium Carbonate, CaCO3)
Hardness: 3-4 (Mohs scale), Color: tan to reddish-brown, Luster: dull to earthy, Structure: clastic/biogenic containing fossil fragments, Cleavage: poor/none
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Physical properties
Hardness: 3-4 (Mohs scale), Color: tan to reddish-brown, Luster: dull to earthy, Structure: clastic/biogenic containing fossil fragments, Cleavage: poor/none
Formation & geological history
Formed in shallow, warm marine environments where biological debris like shell fragments and skeletal remains accumulate and are compressed over millions of years. Common in Paleozoic to Mesozoic strata.
Uses & applications
Used in construction, cement production, agriculture for soil pH balance, and as decorative stone in landscaping. High-quality fossil specimens are used for educational purposes and private collections.
Geological facts
Limestone makes up about 10% of the total volume of all sedimentary rocks on Earth. This specific specimen appears to contain crinoid or shell fragments embedded in a micritic matrix.
Field identification & locations
Identified in the field by its reaction (fizzing) with dilute hydrochloric acid and the presence of visible fossil remains or casts. Commonly found in road cuts, riverbeds, and cliffsides in karst regions.
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