fossil
Crinoid Stem Fossil (in matrix)
Crinoid (Class Crinoidea)
Hardness: 3 (calcite matrix) to 6.5 (if silicified); Color: Dark brown to grey matrix with a white/circular fossil inclusion; Luster: Dull to earthy; Structure: Cylindrical/columnal segments.
- Hardness
- 3 (calcite matrix) to 6
- Luster
- Dull to earthy
Identified More fossil →
Explore Crinoid Stem Fossil (in matrix) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 3 (calcite matrix) to 6.5 (if silicified); Color: Dark brown to grey matrix with a white/circular fossil inclusion; Luster: Dull to earthy; Structure: Cylindrical/columnal segments.
Formation & geological history
Formed in Paleozoic era marine environments, where dead sea lilies (echinoderms) were buried in sediment that later lithified into limestone or shale.
Uses & applications
Geological collecting, educational specimens, and historical research into prehistoric marine life.
Geological facts
Crinoids are known as 'sea lilies' due to their plant-like design, but they are actually animals related to starfish and sea urchins. Their stems are frequently found segmented like 'Cheerios'.
Field identification & locations
Identified by the distinct circular or star-shaped cross-section of the stem columnals. Commonly found in limestone outcrops and along creek beds in the Midwest and Appalachian regions.
More like this
Other fossil specimens
Crinoid Stem Fossil in Matrix
Phylum Echinodermata, Class Crinoidea
fossil
Sedimentary Outcrop (Sandstone/Shale)
Sedimentary bedrock formation (variable composition)
sedimentary
Fossiliferous Limestone
Fossiliferous Calcilutite / Biomicrite
sedimentary
Fossiliferous Limestone
Biogenic Limestone with Brachiopod/Crinoid fragments
sedimentary
Fossilized Crinoid Stem in Limestone
Crinoidea (Class) in Calcium Carbonate (CaCO3) matrix
fossil
Fossiliferous Limestone
Limestone with embedded fossil cross-section
sedimentary