The Los Angeles Basin is located in southern California, in a region known as the Peninsular Ranges. The basin is also connected to an anomalous group of east-west trending chain of basin collectively known as the California Transverse Ranges. The present basin is a coastal lowland area, whose floor is marked by elongate low ridges and groups of hills that is located on the edge of the Pacific plate. Along with the Los Angeles Basin, the Santa Barbara Channel, the Ventura Basin, the San Fernando Valley, and the San Gabriel Basin lie within the greater southern California region. On the north, northeast, and east, the lowland basin is bound by the Santa Monica Mountains mountains and Puente, Elysian, Repetto hills. To the southeast, the basin is bordered by the Santa Ana mountains and the San Joaquin Hills. The western boundary of the basin is marked by the Continental Borderland and is part of the onshore portion. The California borderland is characterized by north-west trending offshore ridges and basins. The Los Angeles Basin is notable for its great structural relief and complexity in relation to its geologic youth and small size for its prolific oil production. Yerkes et al. identify 5 major stages of the basin's evolution that begins in the Upper Cretaceous and ends in the Pleistocene. This basin can be classified as an irregular pull-apart basin accompanied by rotational tectonics during the post-early Miocene.