Dendrocrinus
caduceus
This is a rare fossil -
it’s the head of the cladid crinoid Dendrocrinus caduceus (Hall, 1866).
The arms have been detached, so what remains is called the cup.
Classification: Echinodermata, Crinoidea, Cladida, Dendrocrinidae
Stratigraphy: float from the upper Waynesville Formation, Richmondian Stage, upper
Cincinnatian Series, upper Upper Ordovician
Locality:
loose piece from “flats” of Caesar Creek Lake’s emergency spillway,
southwestern side, ~2/3-of-the-way between Clarksville Road & Roaring Run,
northeastern Warren County, southwestern Ohio, USA.
Dendrocrinus caduceus (Hall,
1866) cup from the Waynesville Formation at Caesar Creek Lake spillway,
southwestern Ohio, USA.
Height of preserved cup = ~9.5 mm
Diameter of cup base = ~2 mm
Diameter of top of preserved cup = ~7 mm to ~9 mm
(slightly compressed)
Dendrocrinus caduceus (Hall,
1866) cup from the Waynesville Formation at Caesar Creek Lake spillway,
southwestern Ohio, USA.
Height of preserved cup = ~9.5 mm
Diameter of cup base = ~2 mm
Diameter of top of preserved cup = ~7 mm to ~9 mm
(slightly compressed)
Dendrocrinus caduceus (Hall,
1866) cup from the Waynesville Formation at Caesar Creek Lake spillway,
southwestern Ohio, USA.
Height of preserved cup = ~9.5 mm
Diameter of cup base = ~2 mm
Diameter of top of preserved cup = ~7 mm to ~9 mm
(slightly compressed)
Dendrocrinus caduceus (Hall,
1866) cup (view of base, showing ~rounded pentagonal lumen) from the
Waynesville Formation at Caesar Creek Lake spillway, southwestern Ohio, USA.
Diameter of cup base = ~2 mm
Dendrocrinus caduceus (Hall, 1866)
cup (C-D interray at bottom of photo) from the Waynesville Formation at Caesar
Creek Lake spillway, southwestern Ohio, USA.
Diameter of cup base = ~2 mm
Diameter of top of preserved cup = ~7 mm to ~9 mm
(slightly compressed)
Dendrocrinus caduceus (Hall,
1866) cup (C-D interray at bottom of photo) from the Waynesville Formation at
Caesar Creek Lake spillway, southwestern Ohio, USA.
Diameter of top of preserved cup = ~7 mm to ~9 mm
(slightly compressed)
Collected 6 May 2006 by Katrina Hursey.