 Until his findings, the Upper Paleolithic societies of Northern Asia were virtually unknown.Over the remainder of his career, Gerasimov twice more visited Mal'ta to excavate and research the site.Mal'ta consists of semi-subterranean houses that were built using large animal bones to assemble the walls, and reindeer antlers covered with animal skins to construct a roof that would protect the inhabitants from the harsh elements of the Siberian weather.