In the spring of 1912, at the invitation of a private individual, I had occasion to carry out some drilling work in the Bukhara domains near the city of Termez, in the lower reaches of the valley of the Surkhan River and the Sherabad-Darya River. During this trip, as well as during some excursions from the city of Termez, I carried out geological observations and collected geological material. In the winter of 1912–1913, this material was examined, and on the basis of the data obtained, the following essay was compiled.