Uniface

In archaeology, a uniface is a specific type of stone tool that has been flaked on one surface only. There are two general classes of uniface tools: modified flakes—and formalized tools, which display deliberate, systematic modification of the marginal edges, evidently formed for a specific purpose. While many worked stone tools can be technically designated as "modified flakes," for lithic analysis purposes a modified flake is usually defined as a lithic flake with one or more edges that were altered either through opportunistic use or through nonsystematic retouching; it is often difficult to identify the process that produced the observed edge. Opportunistic use occurs when a sharp flake is used as-is, without edge-modification. Nonsystematic retouching occurs when pressure flaking is used to remove a few trimming flakes from the edge, in no discernible or extensive pattern. Some unifaces are characterized by systematic edge retouch, which was used to thin, straighten, sharpen, and smooth an artifact's edge, and were usually created with a specific purpose in mind. These formalized unifaces were often intended for woodworking, cutting, chopping, or hide-working purposes, and generally fall into easily classifiable types. While the following discussion does not cover some specialized types of unifaces, it does include the most common types. Scrapers are unifacial tools that were used either for hideworking or woodworking. Whereas this term is often used for any unifacially flaked tool that defies classification, most lithic analysts maintain that the only true scrapers are defined on the base of use-wear, and are usually worked at their distal ends—i.e., "end scrapers." Other scrapers include the so-called "side scrapers." Most scrapers are either oval or blade-like in shape. The working edges of scrapers tend to be convex, and many have trimmed and dulled lateral edges to facilitate hafting. One important variety of scraper is the thumbnail scraper, a scraper shaped much like its namesake.