Three stages are outlined in the development of sea lilies of the Mediterranean and Pacific provinces of the USSR. The first, corresponding to the Indus Age and Early Olenecian time of the Early Triassic, is the period of origin of the Mesozoic, crinoid fauna.

The Upper Cretaceous sediments of southwestern Crimea are of considerable interest because in many sections they are well exposed and fully characterized by a variety of fossil fauna. One such section is located in the Belbek River valley. In recent years, extensive material has been collected in this area, allowing not only to detail the dissection of Upper Cretaceous sediments, but also to draw some conclusions about the conditions of their formation and the conditions of existence of Late Cretaceous fauna ...