Crinoid: Stems

© Craven & Pendle Geological Society

The massive size of many of the supposed crinoid stems which have been collected from Salthill Quarry raises the question of their function.  Many stems are encircled by a girdle of cirri which supported the roots.  Other stems carry the cirri-like projections on one side of the stem perhaps indicating that the crinoid felt obliged to rest in horizontal mode - maybe as a protection against storms or perhaps to attack alternative food sources!

Stem Ossicle

Stem with Cirri