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Classification of Oldowan tools is still somewhat contentious.
Mary Leakey was the first to create a system to classify Oldowan assemblages, and built her system based on prescribed use.
In addition, the Acheulean tradition does not seem to spread to Eastern Asia.
It is unclear from the archaeological record when the production of Oldowon technologies ended. Later tool-makers clearly identified and reworked flakes.
Oldowan tools were probably used for many purposes, which have been discovered from observation of modern apes and hunter-gatherers.
Both technologies are occasionally found in the same areas, dating to the same time periods.
This realisation required a rethinking of old cultural sequences in which the more "advanced" Acheulean was supposed to have succeeded the Oldowan.
The system included choppers, scrapers, and pounders.
However, more recent classifications of Oldowan assemblages have been made that focus primarily on manufacture due to the problematic nature of assuming use from stone artefacts.