Crinoidal Limestone thin section slide exhibiting a cross sectional view of crinoid stems and ossicles held within a calcite cement. Not all of the intricate detail has been preserved in the crinoids but this offers an opportunity to interpret the diagenetic history of the rock by analysing the nature, shape and relationship of the minerals present. This crinoidal limestone from Derbyshire was laid down in a shallow tropical sea around 300 million years ago in the Carboniferous. The section is made to 30 microns thickness and the glass is 46 x 27 mm in size with a cover slip. Supplied in a protective card sleeve with a label, ideal for microscopy.
