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Development of a Late Quaternary Marine Terraced Landscape during On-Going Tectonic Contraction, Crescent City Coastal Plain, California

Published online by Cambridge University Press:  20 January 2017

Michael Polenz  and
Harvey M. Kelsey
Michael Polenz
Affiliation:
GeoEngineers, 252 Hillsdale Street, Eureka, California, 95501
Harvey M. Kelsey
Affiliation:
Department of Geology, Humboldt State University, Arcata, California, 95521
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Abstract

The Crescent City coastal plain is a low-lying surface of negligible relief that lies on the upper plate of the Cascadia subduction zone in northernmost California. Whereas coastal reaches to the north in southern Oregon and to the south near Cape Mendocino contain flights of deformed marine terraces from which a neotectonic history can be deduced, equivalent terraces on the Crescent City coastal plain are not as pronounced. Reexamination of the coastal plain revealed three late Pleistocene marine terraces, identified on the basis of subtle geomorphic boundaries and further delineated by differentiable degrees of soil development. The youngest marine terrace is preserved in the axial valley of a broad syncline, and the two older marine terraces face each other across the axial region. An active thrust fault, previously recognized offshore, underlies the coastal plain, and folding in the hanging wall of this thrust fault has dictated, through differential uplift, the depositional limits of each successive marine terrace unit. This study demonstrates the importance of local structures in coastal landscape evolution along tectonically active coastlines and exemplifies the utility of soil relative-age determinations to identify actively growing folds in landscapes of low relief.

Type
Research Article
Information
Quaternary Research , Volume 52 , Issue 2 , September 1999 , pp. 217 - 228
Copyright
University of Washington

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