What defines a blade in the context of stone tools?

A blade in the context of stone tools is defined as a linear flake that is at least twice as long as it is wide. This definition is significant because it emphasizes the specific geometric proportions that characterize blades, distinguishing them from other types of stone tool flakes. The elongated shape of blades allows for more effective cutting edges, making them especially useful in various prehistoric toolkits for tasks such as cutting, scraping, and hunting.

In contrast, the other options do not accurately capture the essence of what constitutes a blade. For instance, a piece shorter than it is wide, although it may refer to a stone flake, does not meet the dimensional criteria that define blades. A tool used exclusively for carving refers to a functional aspect rather than the physical characteristics of the stone tool itself, and while some blades may be used for carving, the term "blade" is not confined to that function. Lastly, a type of core used for making tools misrepresents the concept, as cores are the larger pieces from which blades are struck, rather than the blades themselves. Understanding these distinctions helps clarify how blades fit into the broader context of lithic technology in anthropology.