Before revision: Sally McBrearty and Alison S. Brooks are notable proponents of gradualism, challenging European-centric models by situating more change in the Middle Stone Age of African pre-history , though this version of the story is more difficult to develop in concrete terms due to a thinning fossil record as one goes further back in time.
After revision: Sally McBrearty and Alison S. Brooks are notable proponents of gradualism, challenging Europe-centered models by situating more change in the Middle Stone Age of African pre-history , though this model is more difficult to substantiate due to the general thinning ofAfrican fossil record as one goes further back in time.