sedimentary
Fossiliferous Limestone or Mudstone
Sedimentary Rock with Invertebrate Fossils
AI-generated identification · may be incorrectHardness typically around 3-4 (Mohs), grayish to brownish color, dull earthy luster, massive structure containing embedded fossil remains.
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Physical properties
Hardness typically around 3-4 (Mohs), grayish to brownish color, dull earthy luster, massive structure containing embedded fossil remains.
Formation & geological history
Formed in marine environments from the accumulation of mud, silt, and calcareous shells of marine organisms over millions of years.
Uses & applications
Often collected for its fossil content; limestone is widely used in construction and agriculture.
Geological facts
The rock displays clear impressions or casts of marine invertebrate fossils, possibly a small ammonite/gastropod and a belemnite or crinoid stem fragment.
Field identification & locations
Identify by the presence of distinct fossil shapes embedded in a fine-grained sedimentary matrix. Common in areas that were once shallow seas.
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