Lake Mohave points are slender lanceolate in shape with the broadest part above mid-section, about three-quarters up from the base. The upper lateral edges are slightly rounded. The over-all impression one has of these lower edges is that of a long tapering stem. Lake Mohave points may be faintly shouldered. Average dimensions are: length about 4.0 to 7.5 cm., width at the broadest part 2.5 to 3.0 cm. Workmanship, though well-achieved, is characterized by irregular initial flake scars, probably produced by direct percussion. Basal thinning was achieved by multi-directional flaking. The estimated age range of Lake Mohave points is from about 7,000 to 9,000 years. It is probable this point type is related to similar types of the Southwest. RIO GRANDE POINTS Rio Grande points were first defined in 1942 on the basis of surface collections of lithic artifacts from the Upper Rio Grande Valley. [Illustration: _Rio Grande_] Rio Grande points are basically lanceolate in shape. Upper lateral edges are straight to gently rounded. They are broadest slightly above mid-section. Lower lateral edges are set off from the upper portion of the point body by very small shoulders, so that this point must be considered stemmed. Stem edges are consistently straight and taper slightly to the base. The base is usually straight, less often it is slightly rounded or shallowly concave. Average dimensions are: length 6.0 cm., shoulder width 2.8 cm., base width 1.8 cm. Some larger specimens are known. Manufacture is by direct percussion. Initial flake scars on point faces are irregular. Basal thinning was accomplished in the main by multi-directional flaking. Stem edges may show secondary percussion or pressure retouch. Stem edges are well smoothed; the base may be slightly smoothed or not at all. The age of Rio Grande points has not been definitely established nor have associations with other early point types been ascertained. They appear to be related to the Hell Gap and Lake Mohave types. ESCOBAS POINTS Escobas points, newly defined in this guide, were to all appearances first discovered and described at Pecos Pueblo, southeast of Santa Fe, New Mexico. Specimens excavated there evidently were collected by inhabitants of the pueblos from nearby sites pre-dating the pueblo. This point type is named after Escobas Peak, near Pecos. [Illustration: _Escobas_]