Lithofacies and chronostratigraphic analyses indicate three relatively warm and three relatively cool paleoclimatic intervals within the 5,000-m-thick strata of the lower Miocene through Holocene Yakataga Formation of the Robinson Mountains, eastern Gulf of Alaska. The cycle identified correlates with the widely recognized paleoclimatic cycle of warm middle Miocene, fluctuating late Miocene, cool terminal Miocene, warm early Pliocene, and cool to cold late Pliocene and Pleistocene. Glacial periods, recognized by the predominance of glacial lithofacies associated with populations of Neoglobigerina pachyderma s.l., are interpreted for the cool intervals. In the sections studied, the interglacial intervals have little or no glacial deposits.

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