Geo-Marine Letters

, Volume 3, Issue 2–4, pp 65–70 | Cite as

The Astoria Fan: An elongate type fan

  • C. Hans Nelson


The Astoria Fan, a modern system, is located on a subducting oceanic crust and fills a north-south-trending trench along the Oregon continental margin. Well-developed channels cross the entire fan length; they display classic inner-fan leveed profiles but evolve into distributaries in the midfan area where the gradient decreases sharply. During periods of low sea level, inner- and middle-fan channels funnel sand to distal depositional sites in the outer-fan area where the sand/shale ratios are highest. This pattern of sand displacement and efficiency of transport appears to be characteristic of elongate fans fed by a major river and submarine canyon.


Turbidite Late Pleistocene Turbidity Current Submarine Canyon Piston Core 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag New York Inc. 1984

Authors and Affiliations

  • C. Hans Nelson
    • 1
  1. 1.U.S. Geological SurveyMenlo Park

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