All bauxite deposits of Northern Kazakhstan are of Mesozoic age of continental type and are represented by hydrargillitic ores. The largest of them are located within the western side and central part of the Turgai Trough and the southeastern slope of the Kazakhstan Shield (respectively, deposits of the West-Turgai, Central and Amangelda bauxite-ore districts).

The role of concentrations of dispersed organic matter in the formation of its microcomponent composition was elucidated using 160 samples of insoluble organic matter concentrates obtained by enrichment from sediments of different ages and different regions of the Soviet Union.