Crinoid fossils are most commonly found in limestone ... particularly in the form of “star stones” or “Indian beads,” which were once used by Indigenous peoples in North America as beads ...

“My reaction was surprise.” An examination of the cleaned-up fossil revealed that it was a regurgitated meal consisting of the two crinoids, a relative of the modern-day sea starfish. Experts ...

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 ...