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The Topanga Canyon Formation (/ t ə ˈ p æ ŋ ɡ ə / ⓘ) is a Miocene epoch geologic formation in the Santa Monica Mountains, Simi Hills, Santa Ana Mountains and San Joaquin Hills, in Los Angeles County, Ventura County, and Orange County, southern California.
Topanga formations of Durrell (1954), and introduced the names “Topanga Canyon Formation” and “Calabasas Formation” for Durrell’s “Lower Topanga Formation” and “Upper Topanga Formation”, respectively, in the central and western Santa Monica
The Topanga Canyon Formation ( / təˈpæŋɡə / ⓘ) is a Miocene epoch geologic formation in the Santa Monica Mountains, Simi Hills, Santa Ana Mountains and San Joaquin Hills, in Los Angeles County, Ventura County, and Orange County, southern California.
Apr 4, 2024 · In central and western Santa Monica Mountains west of Topanga Canyon, Topanga Formation as defined by Kew (1923) is raised in rank to Topanga Group. Subdivided into (ascending): Topanga Canyon Formation (new), Conejo Volcanics and Calabasas Formation (new).
Feb 1, 1991 · The Topanga Canyon Formation within the central Santa Monica Mountains of southern California is a sequence of lower through middle Miocene conglomerate, sandstone, and siltstone deposits that record a lower, wave-dominated, marine, retrogradation cycle; a middle, river-dominated, marine and fluvial, progradational cycle; and an ...
The "Topanga Canyon" Formation within the central Santa Monica Mountains of southern California is a sequence of lower Miocene conglomerate, sandstone, and siltstone deposits that record two major cycles of marine retrogradation separated by delta progradation.
Topanga Formation. The Topanga Formation comprises mixed sedimentary and volcanic rocks with an erosional base (unconformity) on underlying sediments. The formation consists of basal marine conglomeratic sandstone, a more volcanic middle layer with submarine lava flows and tuffs, and an upper sedimentary breccia, conglomerate, sandstone, and a ...
