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2" Fossil Crinoid (Actinocrinites) - Crawfordsville, Indiana
This is a 2" long crown Actinocrinites americanus crinoid from the famous crinoid beds near Crawfordsville, Indiana. The quality of preparation on this fossil is excellent, using skillful air-abrasion techniques under a stereo microscope.
It comes with an acrylic display stand.
It comes with an acrylic display stand.
About Crawfordsville Crinoid Fossils
Crinoids from the Ramp Creek Limestone of Crawfordsville, Indiana are world-famous for their extraordinary preservation and diversity. During the Mississippian Period, sudden storm events likely swept fine sediment from nearby deltas across the seafloor, rapidly burying living crinoids where they stood. This quick entombment protected even the most delicate structures, resulting in soft siltstone that can be carefully prepared to reveal fossils in stunning, fully three-dimensional relief.
The Crawfordsville area preserves one of the most important crinoid assemblages ever discovered, with hundreds of described species ranging from common forms to bizarre and highly specialized morphologies. Many specimens retain complete crowns, arms, stems, and even fine pinnules—details that are rarely preserved elsewhere. Because of this exceptional quality, Crawfordsville crinoids have played a major role in the scientific study of crinoid anatomy, evolution, and paleoecology.
Crinoids, often called “sea lilies,” are animals rather than plants and belong to the echinoderms, a group that includes starfish, sea urchins, and brittle stars. Like their relatives, crinoids exhibit radial symmetry, tube feet, a water vascular system, and body parts arranged in multiples of five. Crinoids first appeared in the Ordovician Period, nearly 488 million years ago, and while most of the elaborate stalked forms seen at Crawfordsville are long extinct, a small number of crinoid species still inhabit modern oceans today.
Crinoids from the Ramp Creek Limestone of Crawfordsville, Indiana are world-famous for their extraordinary preservation and diversity. During the Mississippian Period, sudden storm events likely swept fine sediment from nearby deltas across the seafloor, rapidly burying living crinoids where they stood. This quick entombment protected even the most delicate structures, resulting in soft siltstone that can be carefully prepared to reveal fossils in stunning, fully three-dimensional relief.
The Crawfordsville area preserves one of the most important crinoid assemblages ever discovered, with hundreds of described species ranging from common forms to bizarre and highly specialized morphologies. Many specimens retain complete crowns, arms, stems, and even fine pinnules—details that are rarely preserved elsewhere. Because of this exceptional quality, Crawfordsville crinoids have played a major role in the scientific study of crinoid anatomy, evolution, and paleoecology.
Crinoids, often called “sea lilies,” are animals rather than plants and belong to the echinoderms, a group that includes starfish, sea urchins, and brittle stars. Like their relatives, crinoids exhibit radial symmetry, tube feet, a water vascular system, and body parts arranged in multiples of five. Crinoids first appeared in the Ordovician Period, nearly 488 million years ago, and while most of the elaborate stalked forms seen at Crawfordsville are long extinct, a small number of crinoid species still inhabit modern oceans today.
SPECIES
Actinocrinites americanus
LOCATION
Crawfordsville, Indiana
FORMATION
Edwardsville Formation
SIZE
Crinoid: 2" long. Rock: 2.7 x 1.8"
CATEGORY
SUB CATEGORY
ITEM
#197494
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