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Distribution of Holocene Foraminifera in the Gulf of Alaska

Bergen, F. W. ; O'Neil, P.

Journal of paleontology, 1979-11, Vol.53 (6), p.1267-1292 [Periódico revisado por pares]

Society of Economic Paleontologists and Mineralogists and the Paleontological Society

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  • Título:
    Distribution of Holocene Foraminifera in the Gulf of Alaska
  • Autor: Bergen, F. W. ; O'Neil, P.
  • Assuntos: Bathymetry ; Beaches ; Fauna ; Gulfs ; Ocean floor ; Oil companies ; Sediments ; Species diversity ; Specimens ; Water depth
  • É parte de: Journal of paleontology, 1979-11, Vol.53 (6), p.1267-1292
  • Descrição: Holocene foraminifera from 93 Gulf of Alaska dart samples and two beach samples were identified and counted. The water depths of the dart samples range from 18 to 2,623 m. Seven bathymetric zones were recognized. Faunal diversities of benthic foraminifera increase sharply across the shelf and more gradually down the continental slope. There is a trend of increasing percentages of planktic foraminifera to about 500 m, but there is no consistent trend below that depth. The percentages of arenaceous foraminifera are generally low to a depth of 1,174 m and often high but very erratic below that depth. Two mutually exclusive continental shelf faunas are more related to ocean floor sediment composition and submarine topography than to water depth. The "blue" fauna, dominated by high percentages of Elphidium, Elphidiella, Buccella and Nonionella, is associated with ocean floor sediments consisting of clay, silt or fine sand collected from areas of low relief. The "gold" fauna, dominated by high percentages of Cassidulina and Cibicides, is associated with pebbles, sand and mud with abundant shell fragments and occurs on submarine banks and ridges or on truncated older sediments. A few species range into progressively shallower water northward from California to Alaska. Other species exhibit the opposite trend and many species have about the same bathymetric ranges from south to north. Many shelf species occur exclusively in northern waters and others exclusively south of Alaska and/or Washington. The continental slope faunas are more cosmopolitan.
  • Editor: Society of Economic Paleontologists and Mineralogists and the Paleontological Society
  • Idioma: Inglês
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