fossil

Fossil-bearing Sedimentary Rock

Sedimentum cum fossili

Hardness: 3-5 on Mohs scale depending on matrix, Color: Brownish-grey with lighter fossil impression, Luster: Dull or earthy, Crystal structure: Microcrystalline or amorphous matrix

Identified August 5, 2026More fossil →

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Physical properties

Hardness: 3-5 on Mohs scale depending on matrix, Color: Brownish-grey with lighter fossil impression, Luster: Dull or earthy, Crystal structure: Microcrystalline or amorphous matrix

Formation & geological history

Formed through the accumulation and lithification of mineral or organic particles (sediment) in aquatic environments, trapping biological remains that later leave an impression or are mineralized over millions of years.

Uses & applications

Used for educational purposes, scientific study, and by fossil collectors.

Geological facts

Fossils provide crucial evidence for the history of life on Earth, helping scientists understand evolution and past environments.

Field identification & locations

Look for distinct outlines, molds, or casts of ancient organisms embedded within sedimentary layers such as limestone, shale, or sandstone.

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Crinoid Stem Fossil in Matrix

Phylum Echinodermata, Class Crinoidea

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Sedimentary Outcrop (Sandstone/Shale)

Sedimentary bedrock formation (variable composition)

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Chert with Fossil Brachiopod

Microcrystalline Quartz (SiO2) with Calcitic Brachiopod inclusion

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Crinoid Stem Fossils (Indian Beads / St. Cuthbert's Beads)

Crinoid columnal ossicles (phylum Echinodermata)

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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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