О биогеографических реконструкциях морских фаун геологического прошлого

Some issues in biogeographic reconstructions of marine faunas of the geologic past are considered. The nature of biogeographic boundaries is discussed, and the criteria for identifying and the rank of established biochories, in particular, the applicability of various indices of biogeographic similarity, are considered. It is concluded that only the use of the entire complex of paleobiogeographic methods permits to reconstruct the features of the ancient organisms geographical differentiation most reliably. Such reconstructions should be carried out for the most fractional time intervals at the spe- cies level and based on the integration of data for all fauna groups.