fossil

Fossiliferous Sedimentary Rock

Sedimentary limestone with invertebrate fossil imprint

Hardness: 3-4 on the Mohs scale; Color: Gray to brownish-gray; Luster: Dull to earthy; Crystal structure: Microcrystalline calcite matrix

Hardness: 3-4 on the Mohs scale
Color: Gray to brownish-gray
Luster: Dull to earthy

Identified August 7, 2026More fossil →

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Physical properties

Hardness: 3-4 on the Mohs scale; Color: Gray to brownish-gray; Luster: Dull to earthy; Crystal structure: Microcrystalline calcite matrix

Formation & geological history

Formed in ancient marine environments through the accumulation and compaction of mineral remains, shells, or imprints of marine organisms over millions of years.

Uses & applications

Educational purposes, fossil collecting, and studying ancient marine ecosystems.

Geological facts

Fossiliferous rocks provide crucial evidence of past life and ancient climates, often containing remains of organisms dating back to the Paleozoic or Mesozoic eras.

Field identification & locations

Look for distinct organic shapes, impressions, or patterns embedded within a sedimentary matrix. Commonly found in quarries, sedimentary rock outcrops, and riverbeds.

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Fossilized Crinoid Stem in Limestone

Crinoidea (Class) in Calcium Carbonate (CaCO3) matrix

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Fossiliferous Limestone

Limestone with embedded fossil cross-section

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