Evidence for Eustatic Influence on Cenozoic Sedimentation of Coastal Washington and Oregon

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by Harold L. Cousminer, Dep of the Interior, Camarillo, United States,

Document Type: Proceeding Paper

Part of: Coastal Zone '91

Abstract: Comparison of the absolute age boundaries of the West Coast biozonation with the Cenozoic global cycle chart indicates that 12 of the 15 zonal boundaries coincide with regressive sequence boundaries of the global cycles. In coastal Washington and Oregon and in the Outer Continental Shelf, Cenozoic strata are bounded by four regional unconformities. Geographically widespread, but geologically restricted, coal deposits in coastal Washington and Oregon also correlate with the regressive supercycle boundaries on the Cenozoic global cycle chart. These paleontological, stratigraphic and coal distribution data clearly indicate the influence of global sea level cycles on the Cenozoic sedimentation of coastal Washington and Oregon.

Subject Headings: Coastal environment | Sediment | Domain boundary | Sea level | Stratigraphy | Zoning | Comparative studies | Washington | North America | United States | Oregon

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