MINERALOGY OF CLAYS FROM THE ODESSA COAST OF THE BLACK SEA

A study was made of the clay belonging to the Upper Miocene (bluish-gray clay), Upper Pliocene (reddish-brown clay), Holocene and Pleistocene (loess-like clay) from the landslide district near Odessa. The investigation has shown that the clays of these three units are not monomineralic and that each one has features indicating the prevalence of hydromica or montmorillonite as the main rock-forming mineral. Thus, hydromica is dominant in the blue-gray clay, while montmorillonite prevails in those that are reddish-brown and loess-like. These deductions have been fully confirmed by calculation of the size of the basic cells. --auth.