Cores and tools. (A) Core on flake; (B) Discoid core; (C) Serrated drill; (D) Raised drill. Credit: Image courtesy of the Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences.

Cores and tools. (A) Core on flake; (B) Discoidal core; (C) Serrated drill bit; (D) Raised drill bit.
Credit: Image from the Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences.