Two smoothed slabs of crinoidal limestones attached make for an attractive bookend along with another raw slab containing internal moulds of Crinoid stem fragments from the columnals forming stem. These layers of stem fragments have a distinctive 'screw-like' thread pattern and have been called screwstones.
The Form
An array of branching arms (brachia) is arranged around the top of a globe-shaped, cup like structure (calyx) containing the main body of the creature. In many fossil forms, the calyx was attached to a flexible stem that was anchored to the Sea bed.
The skeleton is made of the mineral calcite and consists of hundreds of individual plates of many shapes and sizes.
Positioning:
A great conversation piece and zoom aesthetics for the study or private library. (Note: composition and colouration will vary)