fossil

Fossiliferous Limestone Pebble

Biogenic Sedimentary Rock (CaCO3)

Hardness: 3 (Mohs scale); Color: Grey with lighter grey fossil inclusions; Luster: Dull/Earthy; Structure: Fine-grained matrix with visible bioclastic fragments; Cleavage: None (conchoidal to irregular fracture).

Hardness: 3 (Mohs scale)
Color: Grey with lighter grey fossil inclusions
Luster: Dull/Earthy

Identified July 2, 2026More fossil →

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Physical properties

Formation & geological history

Formed in a shallow marine environment where calcium carbonate accumulated alongside the remains of marine organisms. The visible circular patterns are likely cross-sections of fossilized crinoid stems or small shells from the Paleozoic or Mesozoic era.

Uses & applications

Primary source for lime and cement production; crushed stone for construction; educational specimens for paleontology; decorative river stones.

Geological facts

Limestone covers about 10% of the Earth's land surface. The fossils within this specific pebble act as a 'time capsule' for the ancient sea floor where it originally formed.

Field identification & locations

Identify by its reaction (fizzing) to a weak acid like vinegar. Commonly found in riverbeds, glacial tills, and coastal areas near sedimentary basins. Look for weathered surfaces that reveal the internal fossil structures.

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Fossilized Crinoid Stem in Limestone

Crinoidea (Class) in Calcium Carbonate (CaCO3) matrix

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Fossiliferous Limestone

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Fossiliferous Limestone with Crinoid stems

Limestone (CaCO3) containing Crinoidea fossils

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Crinoid Fossil in Limestone

Crinoidea fossil (stalk segments) in Calcium Carbonate (CaCO3) matrix

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