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Spectacular 16" Fossil Crinoid Plate - Crawfordsville, Indiana
This is a superb, one of a kind crinoid, holdfast, and starfish association plate collected from the Edwardsville Formation of Crawfordsville, Indiana. The crinoids include: Cyathocrinites multibrachiatus (#17), Histocrinus sp. (#29), a huge Actinocrinites gibsoni crinoid (#52), Camptocrinus sp. (#57), three Macrocrinus mundulus crinoids (#69), Eretmocrinus granuliferus (#77), two unidentified crinoids (#97), and an incredible Cyathocrinites nodosus (#100) crinoid with no crushing of the calyx. The plate also includes multiple crinoid holdfasts and a starfish (#91) wrapped around the crown of Eretmocrinus granuliferus.
This is a natural association with natural stems, few repairs, and minimal restoration, truly a museum quality specimen. The preparation on these fossils is exquisite - using skillful air-abrasion techniques under a stereo microscope.
#17 - Cyathocrinites multibrachiatus (5.5" long including stem)
#29 - Histocrinus sp. (5" long including stem)
#52 - Actinocrinites gibsoni (6.5" long including stem)
#57 - Camptocrinus sp. (.5" wide)
#69 - Macrocrinus mundulus (1.3", 1.9", and 2.2" long including stems)
#77 - Eretmocrinus granuliferus (1.95" long)
#91 - Unidentified Starfish (1.7" wide)
#97 - Unidentified Crinoids (.8" and 2.2" long including stems)
#100 - Cyathocrinites nodosus (4.3" long including stem)
Just to the right of Cyathocrinites multibrachiatus (#17) and just below Actinocrinites gibsoni (#52) is what appears to be either another crinoid or a holdfast. Without a calyx visible, it's difficult to accurately identify, though its arms are similar in structure to Barycrinus.
This is a natural association with natural stems, few repairs, and minimal restoration, truly a museum quality specimen. The preparation on these fossils is exquisite - using skillful air-abrasion techniques under a stereo microscope.
#17 - Cyathocrinites multibrachiatus (5.5" long including stem)
#29 - Histocrinus sp. (5" long including stem)
#52 - Actinocrinites gibsoni (6.5" long including stem)
#57 - Camptocrinus sp. (.5" wide)
#69 - Macrocrinus mundulus (1.3", 1.9", and 2.2" long including stems)
#77 - Eretmocrinus granuliferus (1.95" long)
#91 - Unidentified Starfish (1.7" wide)
#97 - Unidentified Crinoids (.8" and 2.2" long including stems)
#100 - Cyathocrinites nodosus (4.3" long including stem)
Just to the right of Cyathocrinites multibrachiatus (#17) and just below Actinocrinites gibsoni (#52) is what appears to be either another crinoid or a holdfast. Without a calyx visible, it's difficult to accurately identify, though its arms are similar in structure to Barycrinus.
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
Various
LOCATION
Crawfordsville, Indiana
FORMATION
Edwardsville Formation
SIZE
Rock: 16 x 6.7"
CATEGORY
SUB CATEGORY
ITEM
#255133
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