Gravity-flow deposits from the St. Croix Ridge: Depositional history |
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| Authors: | Troy L Holcombe Cynthia G Fisher Frederick A Bowles |
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| Institution: | (1) Marine Geology and Geophysics Division, National Geophysical Data Center, 80303 Boulder, CO, USA;(2) Sea Floor Division, Naval Ocean Research and Development Activity, NSTL, 39529, MS, USA;(3) Present address: Department of Geological Sciences, University of Colorado, 80309 Boulder, CO, USA |
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| Abstract: | Gravity-flow sediments from the South Virgin Islands Trough Escarpment (west of the island of St. Croix) contain Late Cretaceous through Late Miocene nannofossils that are well mixed even within individual samples. These sediments, reworked and redeposited in latest Miocene or Early Pliocene, apparently occur within a sequence of Late Miocene-to-recent fan deposits. Marine source beds representing all pre-Pliocene epochs of the Cenozoic and latest Cretaceous must have been exposed along the NW-facing West St. Croix Escarpment. Southward tilting of the St. Croix Ridge has subsequently altered the depositional pattern. |
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