Prompted by this article [https://www.aljazeera.com/news/2021/7/28/archaeologists-in-morocco-announce-major-stone-age-find](https://www.aljazeera.com/news/2021/7/28/archaeologists-in-morocco-announce-major-stone-age-find)
In: Earth Science
Stone tools have been deliberately chipped away at to make a certain shape. Stone-age humans did this by striking specific types of stone against other stones at specific angles to shatter the rock crystal in a way that makes a sharp, scalloped edge.
Finding a rock that has one of these scalloped strikes in it could very well be a coincidence from a past landslide. Finding one that has forty of them in a row to form a cutting edge is no accident.
The key is not just the shape of the rock, but also *how* it got that shape. You can tell by the way the rock faces are arranged if the shaping all happened in one shattering event or it it was meticulously chipped and polished.
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