bifacialRet1
Bifacial retouch position is produced when direct retouch and inverse retouch are applied along the same section of the same edge of an artifact (in opposition to alternate retouch, where this combination is found along opposite edges). It has been defined by Tixier 1974, 4 as "retouch worked on both surfaces of an object, covering each surface partially or totally." It is possible to ascertain the last surface to be worked by determining which set of retouch scars are complete and which set are cut by these detachments.