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While Hans Reck was the first geologist to attempt to understand the geology of the gorge, our current understanding of the geology of the stratigraphic sequence of Olduvai Gorge was made possible in large part by the efforts of geologist Richard Hay. Hay spent twelve years studying the geology at Olduvai, much of it working along with Mary Leakey, finally formulating a detailed picture of the geologic history of the area. Hay's seminal work "The Geology of the Olduvai Gorge" was published in 1976.