Foraminiferal biostratigraphy and correlations in the Gulf of Alaska Tertiary Province

Abstract

INTRODUCTIONAs part of ongoing research by the U.S. Geological Survey on the geology and resource potential of the Gulf of Alaska Tertiary Province, a vast amount of data has been accumulated over the past 25 years on the lithology and paleontology of bedded rocks in the province. This report brings together available information on the occurrence, age, and paleoecological significance of benthonic foraminifers and presents correlations based on these data from 16 measured stratigraphic sections and 12 exploratory wells. Relatively few reports employing modern taxonomic methods developed during the past 40 years have been published on foraminiferal

Geomorphic expression and slip rate of the Fairweather fault, southeast Alaska, and evidence for predecessors of the 1958 rupture

“…30 Ma (Plafker et al, 1994;Pavlis et al, 2004). West of the fault, the coastal foothills consist of Mesozoic flysch and mélange facies of the Yakutat Group, Cenozoic granitic rocks, and middle Miocene-Pleistocene siltstones and sandstones of the Topsy and Yakataga Formations (Marincovich, 1980;Rau et al, 1983). The Topsy and Yakataga Formations belong to a distinctive cover sequence that chronicles Yakutat terrane collision, accretion, and glaciation (Plafker et al, 1994;Pavlis et al, 2004).…”