Interesting to learn about how certain river rocks / cobbles are better than others. A kind of geological survival of the fittest. I'd be curious to see a map of how erosion patterns along a river might yield the best (and worst) cobbles for handaxe-making.
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It is more dependent on the source of the material than the action of the river. The good thing for our ancestors is that if a river cuts through a small but good source, that good material can be found for hundreds of kilometers downstream.