UCSB beach, 28 May 1978. Oblique aerial view toward southwest and
UCSB campus of wide sandy beach. Tide height is unknown. Sand is
transported from right to left along coast in background, thence
around Campus Point in upper left corner, thence along beach from
upper left to center to lower center. Lower two-thirds of seacliff
consists of silty diatomaceous shale of Sisquoc Formation (Dibblee,
1987). Upper one-third is Quaternary terrace that is fossiliferous
marine silt and sand in its lower part, and mostly aeolian sand
and silt in its upper part. Unvegetated area in lower right corner
is indurated Sisquoc Formation. The sand supply derives primarily
from creeks that transport sand from coastal mountains west to Pt.
Conception (Pollard, 1979). Less than 1% of the sand comes from
erosion of the seacliffs (Runyon & Griggs, 2003).
Dibblee, T. W., Jr., 1987. Geologic Map of the Goleta Quadrangle,
Santa Barbara County, California. Dibblee Foundation Map #DF-07,
Pollard, D. D., 1979. The Source and Distribution of Beach Sediment,
Santa Barbara County, California. PhD Dissertation, University of
California, Santa Barbara.
Runyon, K., and G.B. Griggs, 2003. The effects of armoring seacliffs
on the natural sand supply to the beaches of California. Journal
of Coastal Research 19(2), 336-347.