The artifacts from LAn-2 constitute a problem of their own and will be described in a later section of this paper covering the excavation of that site. FLAKED TOOLS With few exceptions, the additional flaked tools represent roughly the same sample as already revealed. Concave scrapers, thumbnail scrapers, a crescentic stone, and new projectile point types make up the adjunct to the typology. The frequencies for most of the groups of flaked tools are reasonably higher than was heretofore indicated. This is probably the result of the more extensive excavations carried out in the areas of greatest artifact concentration. [Illustration: Figure 1. Location of Features and Burials] _Scraper Planes_ Numerically, scraper planes as an entire class constitute the largest single stylized group of artifacts from the Tank Site. Some forms display a marked perfection in flaking technique, and are comparable to illustrated specimens from the San Dieguito industry (M. J. Rogers, 1929; 1939, pl. 8, _i-j_) on the southern California coast and in the Lake Mohave Culture (Campbell _et al._, pls. XXVI, XXVII) in the eastern desert. The majority, however, exhibit only generalized characteristics with considerable latitude in external form suggesting that their manufacture required little precision on the part of the maker, and probably, also, they served essentially as an all-purpose tool. The nature of the wear on much-used specimens indicated hard usage, such as would result from repeated contact on an unyielding surface. Figure 2 illustrates "ideal" scraper-plane types and the following description is a brief summary of the recognized forms. (For photographs, see Treganza and Malamud, 1950, pls. 17-19.) _Type IA_ Round to oval in outline, flat base chipped about the entire perimeter. Top surface flaked to a near symmetrical dome shape. _Type IB_ Like IA, except that the upper surface rises to a peak or ridge somewhat off-center. _Type IC_ Like IA, but higher and with more latitude in form. Flakes are struck from the perimeter at a steep angle so that on most specimens height exceeds diameter. _Type IIA_ Form is variable, but tends toward subrectangular. About three-quarters of the basal margin evidences flaking, the remaining portion consists of an unretouched straight edge caused by the removal of a large primary flake. _Type IIB_ Like IIA, except that the worked edges display a marked degree of secondary flaking or resharpening, to the point where sections of the steepened sides are notably undercut. _Type III_ Distinct from other forms in that they are shaped from angular rocks on which two separate working faces have been developed. In other respects the specimens in this category fall essentially into the IIA class. Table 2 Frequency of Scraper Planes by Depth