Fig. 7: Intermediate polish formation on artefact #923, a scraper from Layer 18.
From: Abrupt onset of intensive human occupation 44,000 years ago on the threshold of Sahul
A, B show the working edge of the tool on the contact face, with microscars perpendicular to the edge and micro polish that invades inward (100x). C shows the opposite (non-contact) face, where Polish development is limited to the immediate edge.
