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Landslide-dammed paleolake perturbs marine sedimentation and drives genetic change in anadromous fish

  1. Michael P. Lambb
  1. aDepartment of Geological Sciences, 1272 University of Oregon, Eugene, OR 97403; and
  2. bDivision of Geological and Planetary Sciences, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125
  1. Edited by Thomas Dunne, University of California, Santa Barbara, CA, and approved September 15, 2011 (received for review June 27, 2011)

  1. Fig. 1.

    (A) Eel River catchment showing major tributaries and the extent of the paleolake catchment. Inset shows location in northern California. (B) Paleolake extent along the main stem Eel River. Approximate dam location is shown in red. Gray box indicates extent of Fig.?3. Coordinates are Universal Transverse Mercator Zone 10N.

  2. Fig. 3.

    Location of landslide scar and approximate dam location shown on a LiDAR-derived blended hillshade and slope map. Inset graphs show cross-section of landslide scar and the modern valley at the dam location used to calculate potential outburst-flood magnitude. Coordinates are Universal Transverse Mercator Zone 10N.

  3. Fig. 2.

    LiDAR-derived hypsometry of 200- to 300-m elevation interval along Eel River upstream of the dam location. Area is binned per meter of elevation and shows a peak at 239–243?m, the elevations where terrace features are observed.

  4. Fig. 4.

    (A) Outcrop of lacustrine deposits exposed on the southern bank of Kekawaka Creek (see Fig.?3 for location). Grid scale is 0.5?m. Matrix supported, poorly sorted angular gravels separate the fine-grained laminated sequences. (B) Sample of finely laminated deposits near the base of the section. The absence of mud cracks suggests no subaerial exposure during deposition, whereas fluid-escape structures and the absence of bioturbation indicate rapid deposition.

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