An ice-age archaeological site at the Jänschwalde surface mining complex, near the city of Cottbus, has yielded the oldest evidence of human life in the state of Brandenburg. The excavations were organized by the Brandenburg State Office of Historical Preservation and the State Archaeological Museum, in cooperation with Freie Universität Berlin and the energy company Vattenfall. In strata of soil about 20 meters deep, geologically dated to the end of the second-to-last ice age – during the Wolstonian Stage – archaeologists from the Brandenburg State Office of Historical Preservation and paleontologists from Freie Universität found bones from various animals, including wolf, horse, moose, and bison. As a result, they were initially able to form an impression of the environment in which prehistoric humans lived.