accretionary prism

World English Dictionary
accretionary wedge or accretionary prism
 
n
geology a body of deformed sediments, wedge-shaped in two dimensions or prism-shaped in three dimensions, that has been scraped off the surface of the oceanic lithosphere as it moves downwards beneath a continent or island arc. The sediments are added to the continental edge
 
accretionary prism or accretionary prism
 
n

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