An upper Oligocene mammalian fauna from Southern California

In a previous paper(1) the writer recorded the presence of upper Eocene land mammals in the Sespe deposits north of the Simi Valley, Ventura County, California. Immediately to the west of the Simi Valley occur the Las Posas Hills, where beds mapped as Sespe form a considerably thinner series of sediments. The chance discovery of fragmentary mammalian remains by Dr. W.S.W. Kew on exposures near the top of this section led to further exploration by field parties of the California Institute with the gratifying result that a large and varied vertebrate assemblage now been obtained. This important site, C.I.T. Vert. Pale. Loc. 126, has come to be called the Kew Quarry and will be referred to in future discussions of the occurrence and fauna under that name.