NEW DATA ON THE STRUCTURE OF THE RHYNCHOLITES HADROCHEILUS (H.) OPTIVUS SHIMANSKY AND H. (H.)SSUM SHIMANSKY

Abstract

The structure of the Lower Cretaceous rhyncholites H. (Hadrochelius) optivus and H. (H.)fissum is studied using SEM. Phyncholites are shown to consist of many alternating homogeneous layers of granular and cryptocrystalline calcite; each of these layers has an identical ultrastructure.