An ocean floor exposed to wind
The surreal landscapes of the Mangyshlak Peninsula are the direct result of aeolian processes acting on an ancient seabed. The region, which includes the vast Ustyurt Plateau, is composed of sedimentary deposits from the Tethys Ocean, an ancient body of water that existed over 10 million years ago. These deposits consist of layers of limestone, chalk, marl, and clay from the Cretaceous and Jurassic periods. When the ocean receded and tectonic activity lifted the plateau, these relatively soft rocks were exposed to the elements.
The primary erosive force here is wind. In this arid, desert climate with sparse vegetation, wind carrying abrasive particles sculpts the rock into fantastic shapes. This process creates landforms called yardangs, streamlined and elongated hills that resemble the hull of a boat; carved from bedrock by wind abrasion and the removal of loose material. The entire region is a case of desert denudation, where wind erosion is the dominant geomorphic agent. The different rock layers erode at different rates, creating multicolored canyons, buttes, and steep cliffs known locally as "chinks".
Salt as an abrasive accelerant
The erosive power of the wind on the Mangyshlak Peninsula is significantly increased by a unique local feature: vast salt marshes, or "sors". The largest of these, Sor Tuzbair, is a massive, flat expanse of salt left behind by the evaporation of ancient lakes and the regression of the Caspian Sea. These dry lakes provide a ready supply of salt crystals, primarily halite.
When strong winds blow across these salt flats, they pick up sand but also these hard, angular salt crystals. This mixture of sand and salt becomes a far more potent abrasive agent than sand alone. The salt crystals, acting like tiny cutting tools, effectively double the rate of abrasion on the surrounding limestone and chalk cliffs. This salt-driven erosion helps to carve the deep canyons and sharpen the edges of the yardangs. The process is a form of salt weathering, where the physical impact of salt crystals contributes directly to the breakdown of rock surfaces.
The landscape is dynamic. The constant wind, the extreme continental climate, and the unique geology combine to create a place that is continuously being reshaped. Fossils of marine life, such as ammonites and the teeth of prehistoric sharks like Parotodus mangyshlakensis, are frequently exposed by this relentless erosion, showing the region's deep-time origins as an ocean floor.