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| Bird nest in an exfoliation cavity in the Painted Rock alcove. note the crossbedded charater of the sandstone in the upper part of the image. Crossbeds reflect deposition of sand under the influence of marine currents. The current direction was to the right. These sediments were deposited nearly 20 million years ago when the region was submerged under a shallow inland bay that flooded the southern San Joaquin Valley region. The sediments has since been tightly cemented by mineral precipitates from groundwater. |
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