Rock Identifier
Crinoid Stem Fossil (Crinoid (Class Crinoidea)) — fossil
fossil

Crinoid Stem Fossil

Crinoid (Class Crinoidea)

AI-generated identification · may be incorrect

Cylindrical or disc-shaped segments (columnals), often with a central hole. Hardness: 3 (calcified), color: brown to gray, luster: dull/earthy, structure: segmented.

Color
brown to gray, luster: dull/earthy, structure: segmented
Luster
dull/earthy, structure: segmented
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Physical properties

Cylindrical or disc-shaped segments (columnals), often with a central hole. Hardness: 3 (calcified), color: brown to gray, luster: dull/earthy, structure: segmented.

Formation & geological history

Formed in shallow marine environments from the Paleozoic era (approx. 250-500 million years ago) through the mineralization of marine animal stems.

Uses & applications

Used for educational study, amateur fossil collecting, and occasionally in jewelry as 'lucky stones' or 'Indian beads'.

Geological facts

Crinoidea are marine animals related to starfish and sea urchins. Although they look like plants and are often called 'sea lilies', they are actually echinoderms.

Field identification & locations

Identified by stackable disc patterns or stars in cross-section. Commonly found in limestone beds, creek beds, and sedimentary outcrops globally.

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Probable fossil-bearing rock or mineral concretion

Unidentified carbonate-rich concretion with a possible fossil inclusion

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Likely fossil oyster shell

Fossilized bivalve shell; exact species cannot be identified from the image

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Crinoid Stem Fossil in Matrix (Phylum Echinodermata, Class Crinoidea) — fossil

Crinoid Stem Fossil in Matrix

Phylum Echinodermata, Class Crinoidea

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Fossiliferous limestone (likely a crinoidal or shell-fragment limestone) (Bioclastic limestone, composed chiefly of calcite (CaCO₃)) — sedimentary

Fossiliferous limestone (likely a crinoidal or shell-fragment limestone)

Bioclastic limestone, composed chiefly of calcite (CaCO₃)

sedimentary
Rounded sedimentary pebble (Likely micritic limestone or calcareous sandstone) — sedimentary

Rounded sedimentary pebble

Likely micritic limestone or calcareous sandstone

sedimentary
Chert with Fossil Brachiopod (Microcrystalline Quartz (SiO2) with Calcitic Brachiopod inclusion) — sedimentary

Chert with Fossil Brachiopod

Microcrystalline Quartz (SiO2) with Calcitic Brachiopod inclusion

sedimentary