English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Sheet 1 of this publication depicts the thickness of a presumed Holocene marine sedimentary stratum on the middle and outer continental shelf of the Beaufort Sea north of Alaska. For convenience in this report. the term "Holocene" is applied to any sediments believed to have been deposited on the shelf subsequent to its subaerial exposure during the final Wisconsinan eustatic sea level minimum about 17,000 years ago. Thus the "Holocene" marine stratum contoured here may include, at its base on the outer shelf, sediments older than the formal Pleistocene-Holocene boundary defined at roughly 10,000 years B.P. by Hopkins (1975). Although several sedimentary facies may be present within the contoured unit. it is referred to in this report as a "stratum" because its seismic signature is homogeneous throughout the map area. Beneath most of the middle and outer shelf the base of the contoured stratum is the uppermost prominent sub-seafloor reflector observed on a grid of high-resolution seismic reflection profiles. The age range of the base of the stratum has not been directly or indisputably established because it has never been sampled in the study area. I f , however, this highly reflective basal surface formed as a result of beins subaerially exposed during the final Pleistocene glacial stage as argued below, then the marine stratum lying depositionally above it must be "Holocene" in the special sense of that term used here. Sheet 2 of this publication provides structural contours on the base of the inferred Holocene stratum. Data points were obtained by adding the present water depth to each measurement of sediment thickness used to generate the isopach map (sheet 1). The results are used in a discussion of the late Quaternary sea level history of the Beaufort Sea. Owing to the high petroleum potential of sediments underlying the Beaufort shelf a large number of current and completed studies have been devoted to understanding the shelf environment and to delineating the engineering characteristlcs of its surficial sediments. Details of the late Quaternary sedimentary history of the shelf resulting from the present study cast light on such problems as active faulting and landsliding, thickness of unconsolidated sediment, and depth to subsea permafrost. The results also provide a few more facts to be considered in correlating the sea level history of the Arctic Ocean with the history of formerly nearby Pleistocene ice sheets.

Holocene marine sediments on the middle and outer continental shelf of the Beaufort Sea north of Alaska