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The Setting of the Gorge and History of Geological
Principles of Environmental Interpretation
Beds III and IV
Acheulian alluvial altered anorthoclase archeologic sites artifacts augitic augitic sandstone authigenic base of Bed Bed II Beds III-IV bifaces bird-print tuff calcite calcrete channels chert clasts clay claystone claystone pellets cm thick conglomerates dates deposits of Bed detritus disconformity dominantly dunes east eastern fluvial deposits eolian tuffs faunal remains Fifth Fault fluvial-lacustrine deposits graben hominid Ignimbrite Kelogi lacustrine Laetolil Beds lake deposits lake-margin deposits lava Lemagrut Lemuta Member limestone lithofacies locality lower unit M. D. Leakey mafic main drainageway Main Gorge marker tuff Masek Beds minerals Naisiusiu Beds Namorod Ash Ndutu Beds nepheline nephelinite Ngorongoro nodules Olbalbal Oldowan Olduvai basin Olduvai Gorge Olmoti ostracods overlying paleogeography percent phonolite quartz reddish-brown reworked rock rootmarked Sadiman saline samples sand sandstone Second Fault sediments Side Gorge siltstone stratigraphic streams tephra trachyte Tuff IB Tuff IID tuffaceous upper unit vitric volcanic western margin widespread zeolites