The Stockton Arch is a geologic feature underlying the Central Valley in California in the vicinity of the delta of the Sacramento and San Joaquin Rivers, near the city of Stockton. The Stockton Arch is an upwarping of the crust beneath the thick sediments of the Central Valley, and is regarded as the subsurface separation between the Sacramento River basin and the San Joaquin River basin.
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“Men seem anxious to accomplish an orderly retreat through the centuries, earnestly rebuilding the works behind them, as they are battered down by the encroachments of time; but while they loiter, they and their works both fall prey to the arch enemy.”
—Henry David Thoreau (1817–1862)