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Acknowledgement/ References Previous studies show that the Plio-Pliestocene transition (PPT), a glacial intensification in the Northern Hemisphere at ~ 2.7 Ma, marks the genesis of the Surveyor Channel system in the northern Gulf of Alaska. Since that time, glacially eroded sediment from the St. Elias Mountains have dominated the evolution of this system. However, many questions remain about the provenance of sediment and the nature of sediment delivery to the deepwater regions prior to the evolution of the Surveyor Channel system. Integrated Ocean Drilling Program (IODP) Exp. 341 obtained sedimentary cores dated as old as ~10 Ma. In this study, we use available 2D seismic data combined with the IODP Exp. 341 core and log data to analyse the depositional environment preceeding and leading up to the PPT (~2.7 Ma). The cores provide lithostratigraphy and an age model of sediment deposition, while seismic data allows us to extend interpretations across the Gulf of Alaska to identify broader depositional patterns associated with the evolving sedimentology of this source to sink system. Figure 1. Gulf of Alaska study area with IODP Exp. 341 drill sites (yellow circles). The Surveyor Channel system shown in green, a nearby Chirikof Channel shown in yellow. Red dashed line denotes the approximate area of Surveyor Fan, nearby Zodiac and Baranof marine fans also shown here. U1418

CORE-LOG-SEISMIC STUDY ON THE PRE-GLACIAL HISTORY OF THE SURVEYOR FAN DEEP-SEA SEDIMENTARY SYSTEM, GULF OF ALASKA