In stone tool terminology, what is a nodule?

A nodule refers to a naturally occurring piece of stone, typically a small, rounded mass of rock that can be used in the production of stone tools. In the context of tool-making, nodules serve as the raw material from which cores, blades, and other tools can be shaped. The process often involves striking or chipping away portions of the nodule to produce sharp edges or specific tool forms.

The other options describe different aspects of stone tool production. A core, for example, is the piece from which flakes are struck to make tools, while a finished tool would be the end product ready for use. Retouching techniques are utilized to modify existing tools for improved functionality or to create specific shapes. Understanding the definition of a nodule as a natural source of stone helps in grasping the broader context of how early humans engaged in tool-making practices.