The Tajik Depression holds sedimentary rocks up to six kilometers thick, including 700 meters of Jurassic salt, overlain by one kilometer thick Cretaceous quartzose sediments and a two kilometer sequence of Cretaceous to Oligocene carbonates, evaporites and shales. Fold and thrusts have deformed all the Tajik Depression rocks above the Jurassic salts. Tajikistan is highly seismically active, due to continued uplift, deformation and the underthrusting of the Eurasian continental crust 300 kilometers beneath the Pamir Mountains.