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I WANT TO WISH MEMBERS AND FRIENDS ON TE A MERRY CHRISTMAS AND A HAPPY NEW YEAR! MAY THE PHOTOGRAPHY GEARS YOU WISH BE GRANTED.

This photo was taken the south side of the Contra Loma Dam and Reservoir. Attached to the reservoir is a small off-stream valley that remains green even during summer time. It runs through the picnic areas. This area runs on the northeast flank of the Los Medanos Hills, about 2.5 km south of Antioch, California. The Los Medanos Hills consist of a generally north dipping sequence of Tertiary strata on the north margin of the Mt. Diablo uplift, and on the southwestern margin of the Sacramento-San Joaquin Delta. In the vicinity of the dam and reservoir the relief of the rolling hills ranges up to about 200 m. The relief increases rapidly to the west and south and decreases to the north and east in the delta area.

In the immediate vicinity of the dam and reservoir the hills are mantled by clayey residual soil, colluvium, and alluvium, and are underlain by a sequence of moderately lithified Tertiary nonmarine and marine sedimentary rocks assigned, in ascending order, to the Eocene Kreyenhagen Formation, the Oligocene Kirker Formation, the Miocene Cierbo Formation, the Mio-Pliocene Neroly Formation, and the Pliocene Wolfskill Formation. The formation contacts generally strike north-northwest east-southeast, and dip to the north at angles up to about 25 degrees. Bedding within these formations is cut by several sets of joints, and locally by minor faults with up to a few feet of offset

Above information taken from http://www.usbr.gov/dataweb/dams/ca

PP Work: Adjust levels control; Adjust saturation; Sharpen; Crop; Reduce image size for posting.

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Additional Photos by Andre Salvador (erdna) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 738 W: 81 N: 1094] (5713)
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