This is a subduction plate boundary. Note that the terrace deposits are at multiple levels and that the river today seems to be incised into the local bedrock well below the lowest point in the pre-fill valley. Create a plausible history of climate and tectonics as revealed in this photo. The old shoreline is now about 15 m above today's sea level. How might such a feature originate and be preserved.
Bedrock is all granite.
Pleistocene deposits along west side of Long Valley Caldera, south of Mammoth A conventional left lateral moraine is seen in the right foreground associated with a past Laurel Canyon glacier. Its matching right lateral is across a tongue of hummocky debris that is almost as massive as the ice that must have deposited those moraines. Central Alaska rivers These gravel bars represent temporary storage of sediments that the river cannot carry except in peak flood stage. The faults may both converge to the north at the earth's surface near Pt. Reyes, and may converge at several miles depth beneath the Salinian Block of lightweight crust.