sedimentary
Vesicular Limestone with Borings
Fossiliferous Calcarenite (Calcium Carbonate, CaCO3)
Hardness: 3-4 (Mohs scale), Color: Dirty white to light tan, Luster: Dull/Earthy, Structure: Bioclastic/Porous, Cleavage: None/Conchoidal on flint inclusions.
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Physical properties
Hardness: 3-4 (Mohs scale), Color: Dirty white to light tan, Luster: Dull/Earthy, Structure: Bioclastic/Porous, Cleavage: None/Conchoidal on flint inclusions.
Formation & geological history
Formed in warm, shallow marine environments from the accumulation of shell fragments and coral. The holes are often biogenic, caused by boring organisms like lithophaga mollusks or sponges.
Uses & applications
Used primarily in gravel, road base, and as architectural stone. Often collected as curiosities for aquarium decor due to natural pits.
Geological facts
The distinctive holes are often trace fossils called Gastrochaenolites, caused by marine animals boring into the rock while it was on the seafloor.
Field identification & locations
Identify by its reaction to dilute hydrochloric acid (it will fizz) and the presence of small pits or holes. Commonly found on beaches or in limestone quarries.
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