Front cover. Oblique aerial view southeastward of Chisik Island summit area. This mountain-scale exposure of Naknek Formation exhibits evidence of a Late Jurassic deep-water canyon incised into slope strata of Snug Harbor Siltstone Member (gray-brown, wedge-shaped succession at left of exposure) and ultimately backfilled with basin-floor sandstones of the Pomeroy Arkose Member (at and below the summit ridge). Stratigraphic studies of the Naknek Formation along the ~80-km-long Iniskin-Tuxedni bays outcrop belt led to the recognition of three deep-water paleocanyons. These discoveries and related work permit the first sequence-stratigraphic interpretation for the Naknek Formation in the hydrocarbon-bearing Cook Inlet forearc basin. See figures 4 and 17A for photogeologic rendition and sequence-stratigraphic interpretation, respectively, of this Chisik Island locality. This part of the exposure is ~275 m tall, for sense of scale. Photograph by T.M. Herriott.
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