Nervous system development of two
crinoid species, the sea lily Metacrinus rotundus and the feather star Oxycomanlhus japonicus.
Isolated
crinoid ossicles, reflecting complete post-mortem disarticulation of individuals during extended residence within the taphonomically active zone (Lewis 1980), represent one of the most abundant bioclasts in the Paleozoic rock record (Lowenstam 1957; Ausich 1997).
In either case, fossilized bivalves,
crinoid fragments, gastropods, shark teeth, sea urchin spines, fish bones, coral, fossilized traces (tracks, burrows, etc.) and other marine fossils may be identified.
Mainly
crinoid's fossils were witnessed on the weathered surfaces.
and Sebek, O.: 1997, Chemical composition of the
crinoid skeletal remains (Echinodermata) in weathered limestones of the Bohemian Lower Devonian (Barrandian area).
War Eagle Cavern--Features an underground stream, an abundance of
crinoid fossils, unusual dome pits, onyx and much more.
If their
crinoid ancestors spent their entire adult lives similarly anchored to one spot, they could not have spread worldwide without help.
I personally like going across the road to
Crinoid Hill to hunt for marine fossils.
These differences included (1) two species, sand star and black
crinoid, whose densities differed between energized and unenergized cables, (2) three species, thin sea pen, red octopus, and white sea urchin, which differed between cable sides, (3) seven species, white-plumed anemone, spot prawn, thin sea pen, California sea cucumber, red octopus, Urticina spp., and black
crinoid, which exhibited bottom depth differences, and (4) two species, thin sea pen and sand star, whose densities varied among years.
Inspect them closely and you may make out the curve of a gastropod, the cone-shaped shell of a cephalopod, or a disc or rod-like structure that was once a piece of a
crinoid stem.
Crinoids tended to grow on the edges of the reefs, so reef limestone is usually surrounded by limestone containing many
crinoid fossils.