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The Olorgesailie Formation is comprised of lacustrine, volcaniclastic and alluvial sediments that formed in the southern Kenya Rift between about 1.2 million and 490,000 years ago. Diatoms are common in much of the sequence and preserve a record of environmental change within the basin. A high-resolution diatom stratigraphy has been developed for these deposits. The data document the presence of freshwater...
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