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In page Angeles Forest Highway:
"Next the road passes through a tunnel, sometimes marked on maps as the Singing Springs Tunnel. At the tunnel's south entrance are rocks of banded gneiss, 1,700 million years old, some of the oldest rock found in the San Gabriel Mountains.[3] The road cuts through a ridge separating the Big Tujunga from its tributary, Mill Creek. From this point, the Angeles Forest Highway follows the west side of Mill Creek.
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