Crinoid fossils are most commonly found in limestone deposits that were once ancient seabeds. These fossils often consist of the stalk or column, the most durable part of the crinoid’s anatomy.

Fieser, L. F., and Fieser, M., Natural Products Related to Phenanthrene (third ed.), 204 (Reinhold, New York, 1949). Fieser, L. F., and Fieser, M., Steroids, 177 ...

The fossils were thought to be nummulites, but afterwards they were shown to be crinoid ossicles of uncertain age. Fifty years later, E. J. Garwood found that the high range bordering Sikkim to ...