Biostratigraphic results of dart-coring in the western Gulf of Alaska, and their tectonic implications

Age determinations are reported for microfossils from 56 dart-cores
collected in 1978 from the Kodiak shelf. The ages suggest that rocks cropping
out along Albatross Bank, at the shelf edge, are as old as middle or late
Miocene, and that the anticline forming Albatross Bank, previously defined
with multi- and single-channel seismic records, plunges northeastward in the
sampled area. Foraminiferal paleobathymetry further suggests that m.ajor
tectonic activity has occurred on the Kodiak shelf since the early or middle
Pliocene, including two episodes of vertical movement--first subsidence on the
order of 2000 m, then uplift of at least 3000 m. Microfossil ages and
paleobathymetric determinations indicate an average uplift rate of 1000-
3000 m/m.y. for the seaward edge of the Kodiak shelf during the Quaternary.