Tijuana River Reserve, California

Soil Types

The lower Tijuana River valley and estuary proper is primarily underlain by undifferentiated alluvium and slope wash comprised of poorly consolidated stream deposits of clay, silt, sand and cobble-sized particles that were deposited in the late Pleistocene. These deposits reach a thickness of approximately 40 meters in some areas throughout the estuary. It is probable that the last of the major alluvial depositional sequences took place during the late Pleistocene and Holocene time, when sea level was receding and subsequently rising again to its present position, at which time alluvial deposition was greatly reduced.

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