Titanothere remains from the Sespe of California

Until very recently, all occurrences of American titanotheres have been known from either Eocene or lower Oligocene horizons of the Rocky Mountains and western Great Plains. Absence of any trace of these mammals in Tertiary deposits located in the region to the west of the Cordilleran Province lends considerable interest to the presence of titanotheres in one of the Sespe horizons of southern California.