Correct Answer !
The raw material used for the manufacture of stone tools. Cores can either be independent nodules, cobbles, or dislodged fragments of bedrock subjected to a lithic reduction sequence that broadly includes the cores, primary elements or flakes exhibiting the outer characteristics of cores, internal or tertiary flakes, bifacial thinning elements, pressure flakes, and the tool itself. As a valuable resource to those who manufactured stone tools, most lithic cores from archaeological sites tend to be exhausted or highly fragmented to the point that they were no longer useful for the production of stone tools. For an example, see "Documenting Inter-Site Functional and Chronological Variability: Troutbrook Valley".