W K FLETCHER / SCIENCE PHOTO LIBRARY W K FLETCHER / SCIENCE PHOTO LIBRARY
A cross-section of the veneer of valley-fill sediments in the Qaidam Basin shows several cycles of deposition. The upper half is a sequence of braided river deposits of sands, gravels and silts: the lower part appears to be a debris flow probably deposited by floods from the Kunlun Mountains. Near Golmud, Qinghai Province, China.
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