Illinois Crinoid Calyx
Mississippian
About Illinois Crinoid Calyx
The Illinois Crinoid Calyx is a echinoderm fossil dating to the Mississippian. Crinoid Calyx is a realistic Illinois fossil profile built around rarer crown portion of sea lilies with cup plates and arm bases. In this state, success usually comes from learning Silurian and Devonian limestones, shale cuts, and glacial gravels, then timing runoff, reservoir drawdown, surf cuts, or road work that exposes fresh fossil-bearing rock instead of hunting blindly.
“According to TroveRadar, Illinois Crinoid Calyx fossils from the Mississippian are found across Illinois. TroveRadar's field database catalogs 696+ fossil entries for identification and collection guidance.”
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Illinois state guide
Fossil collecting rules in Illinois vary by land status and fossil type. Common invertebrate fossils may be collectible on some public lands, but vertebrate fossils, protected park units, tribal lands, and cultural sites require a much higher level of care and often a permit. This is especially relevant in Mazon Creek concretions and Silurian reefs.
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Location: Shawnee National Forest
National Forest • Seasonal edible mushrooms, Common invertebrate fossils in float
Location: Giant City State Park
State Park • Photo opportunities, Exposed shoreline stones
Location: Ferne Clyffe State Park
State Park • Photo opportunities, Exposed shoreline stones
Location: Starved Rock State Park
State Park • Photo opportunities, Exposed shoreline stones
Identification Tips
- ●cup-shaped plated body
- ●radial symmetry
- ●attached arm sockets
- ●Check Silurian and Devonian limestones, shale cuts, and glacial gravels
Where Found
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Related Fossils
Iowa Crinoid Stem
Paleozoic
Crinoid Stem is a realistic Iowa fossil profile built around disk-like stem segments from sea lilies in shallow marine limestone. In this state, success usually comes from learning Silurian and Devonian limestones, shale cuts, and glacial gravels, then timing runoff, reservoir drawdown, surf cuts, or road work that exposes fresh fossil-bearing rock instead of hunting blindly.
Illinois Crinoid Stem
Paleozoic
Crinoid Stem is a realistic Illinois fossil profile built around disk-like stem segments from sea lilies in shallow marine limestone. In this state, success usually comes from learning Silurian and Devonian limestones, shale cuts, and glacial gravels, then timing runoff, reservoir drawdown, surf cuts, or road work that exposes fresh fossil-bearing rock instead of hunting blindly.
Indiana Crinoid Stem
Paleozoic
Crinoid Stem is a realistic Indiana fossil profile built around disk-like stem segments from sea lilies in shallow marine limestone. In this state, success usually comes from learning Silurian and Devonian limestones, shale cuts, and glacial gravels, then timing runoff, reservoir drawdown, surf cuts, or road work that exposes fresh fossil-bearing rock instead of hunting blindly.
Ohio Crinoid Stem
Paleozoic
Crinoid Stem is a realistic Ohio fossil profile built around disk-like stem segments from sea lilies in shallow marine limestone. In this state, success usually comes from learning Silurian and Devonian limestones, shale cuts, and glacial gravels, then timing runoff, reservoir drawdown, surf cuts, or road work that exposes fresh fossil-bearing rock instead of hunting blindly.
Minnesota Crinoid Stem
Paleozoic
Crinoid Stem is a realistic Minnesota fossil profile built around disk-like stem segments from sea lilies in shallow marine limestone. In this state, success usually comes from learning glacial till, Devonian limestones, and Lake Superior gravels, then timing runoff, reservoir drawdown, surf cuts, or road work that exposes fresh fossil-bearing rock instead of hunting blindly.
Wisconsin Crinoid Stem
Paleozoic
Crinoid Stem is a realistic Wisconsin fossil profile built around disk-like stem segments from sea lilies in shallow marine limestone. In this state, success usually comes from learning glacial till, Devonian limestones, and Lake Superior gravels, then timing runoff, reservoir drawdown, surf cuts, or road work that exposes fresh fossil-bearing rock instead of hunting blindly.