NW corner of lake. 20 ft contour interval. Subaqueous shoreline terrace which may be the site of deltaic deposition as a shallow shelf. This is evidence of a previously lower lake level. A deep subaqueous debris flow occurs to the right, which may indicate a tectonic event, such as a pulse of uplift, earthquake, etc, or sudden influx of sediments/water by means of climatic increase in humidity.
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