Caspian Sea and a Pleistocene stage, that includes glaciation cycles and the creation of the present Volga River. During the first stage, the Tethys Sea had evolved into the Sarmatian Lake, that was created from the modern Black Sea and south Caspian, when the collision of the Arabian peninsula with Western Asia pushed up the Kopet Dag and Caucasus Mountains, setting definitive south and west boundaries to the Caspian basin. This orogeneic movement was continuous throughout the years, while Caspian was regularly disconnecting from the Black Sea. In the late Pontian, a mountain arch rose across the south basin and divided it
Black Rock Range Black Rock Range The Black Rock Range is a mountain range in northwestern Nevada. It is named for Black Rock Point, which is located at the southern end of the range. The Black Rock Range divides the Black Rock Desert into eastern and western arms. Pahute Peak, also known as Big Mountain, is the highest point in the range at above sea level. The majority of the range is part of the Black Rock Desert-High Rock Canyon Emigrant Trails National Conservation Area. In addition two separate federally designated wilderness areas are part of the Black Rock Range. Those wilderness areas