Fossilised crinoid columnal segments extracted from limestone quarried on Lindisfarne, or found washed up along the foreshore, were threaded into necklaces or rosaries, and became known as St. Cuthbert's beads.
crinoid |
It is also possible to find the gastropod Platyceras attached to a crinoid or brachiopod, this leads us to think that they fed on their waste.
Bourgueticrinids first appeared in the fossil record during the Triassic period, although other crinoid groups, now extinct, originated in the Ordovician.