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The Los Angeles Basin is a sedimentary basin 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 chains of mountains collectively known as the Transverse Ranges.
Jan 24, 2013 · The crust thinned and "collapsed," forming an immense geologic "bowl." Sand, silt and clay from the sea and ancient rivers poured into the bowl. Microorganisms also poured into this hole, piling high in huge layers. These layers would eventually become the oilfields of Los Angeles.
The Los Angeles Basin, into which more than 80 communities of Los Angeles County are crowded, is a trough-shaped region bounded on three sides by the Santa Monica, Santa Susana, San Gabriel, San Bernadino, and Santa Ana Mountains. On its fourth side, the county looks out over the Pacific Ocean.
Jan 1, 1991 · The Los Angeles basin is a polyphase Neogene basin within the San Andreas transform system between the Pacific and North American plates. The basin was initiated in the mid-Miocene by widespread extension associated with significant strike slip and rotation of the Transverse Ranges of southern California.
Jan 1, 1991 · The Los Angeles basin formed in late Neogene time on a continental margin previously shaped by Cretaceous and early Paleogene subduction, Paleogene terrane accretion, and mid-Miocene rifting and block rotation.
Written histories of the LA River typically begin when the LA basin was still an ocean, up to 10 million years ago. With seismic uplift, the ocean receded, leaving the Santa Susana, Santa Monica, and San Gabriel mountain ranges in its place. The LA River traversed the lowest passages.
Jun 29, 2016 · The Los Angeles Basin is a Miocene-age pull-apart basin that was formed by the passing of the Pacific-Juan de Fuca-North America triple junction by southern California (Nicholson et al. 1994; Ingersoll & Rumelhart 1999).
