 Much of that ongoing uplift is due to tectonics associated with the San Andreas Fault and other fault systems in the region.During the Pleistocene, sometime more recently than 1.8 million years ago, an enormous block of the Temblor Range – a swath of Monterey shale more than six miles (10 km) long, a mile across, and over thick, about three cubic miles of rock in all – slid down the northeastern side of the range, covering a distance of approximately three miles and descending .This mass movement completely covered the McKittrick Oil Field, giving it a highly unusual geology for an oil field, as the petroleum deposits in most oil fields are in structural or stratigraphic traps; this field is capped by an enormous mass of rock that moved off of the adjacent mountain range.