In the spring of 1912, at the invitation of a private person, I had to carry out some drilling work in the Bukhara area near the city of Termez in the lower reaches of the valley of the Surkhana and Shirabad-Darya rivers. 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 reviewed and, based on the data obtained, the following essay was compiled.