The Quaternary terrace formation with its content of paleolithic implements here discussed occurs in the Dahra Range, Department of Oran, Algeria, between the Mediterranean and the plain of the Chelif. The description applies particularly to the region of the old Moorish town of Mazouna on the south flank of the range, some 27 kilometers in an air line south of the coast. This is a region watered by springs in the upper basin of the Oued Ouarizane, in the midst of an open grassy hill country of low and seasonal rainfall. The site of the artifacts deposit is on the north fork of the Oued Krouf, about 1,300 meters as the crow flies north‐east of the center of Mazouna. It is at an altitude of approximately 370 meters, a trifle less than 3 kilometers downstream from the head of the ravine. From this site the drainage follows the . . .