Wild Mustard at Windy Hill

Windy Hill was displaying all its spring colours this evening, with the ridges and the wild mustard shining in the light.

I always wonder what geological cataclysm created those ridges - a combination of folding, scraping, and erosion is my very unscientific guess (this is just a mile or two from the main San Andreas fault rift). Last time I shot the  ridges
(from a different view point) they were looking distinctly autumnal.  Whereas today I know it is Spring, because within 30 minutes the "marine layer" fog came rolling in - I tried to capture it in the extra.