Distribution of the Gondwana rock formations and characteristic field photographs from the Talchir and Barakar Formations in the Raniganj Basin, eastern India. (a) Generalized geological map of the Raniganj basin. Note the distribution of sample locations for the present study. Inset shows the distribution of the major Gondwana basins of Peninsular India. Also note the location of the Raniganj basin. (b) Matrix-supported diamictite of glacial origin from the Talchir Formation. (c) Trough cross-stratified coarse-grained arkosic sandstone from the braided fluvial channel deposits of the Barakar Formation.