Uplifted Trench Sediments: Southwestern Alaska-Bering Shelf Edge

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Science  10 Mar 1972:
Vol. 175, Issue 4026, pp. 1103-1105
DOI: 10.1126/science.175.4026.1103


Cretaceous turbidites are discontinuously exposed for 1700 kilometers along the continental margin of southwestern Alaska and the Bering shelf edge. Paleocurrent flow parallel to exposure patterns and the abundance of primary andesitic volcanic detritus suggest deposition in an oceanic trench. This Cretaceous trench bordering the continent was superseded by the Aleutian arc-trench in the earliest Tertiary.