The Repetto Formation is a Pliocene epoch sedimentary unit in the greater Los Angeles Basin composed primarily of sandstone and conglomerate .
5-656: The unit records deposition of a submarine fan environment at lower bathyal depths, and is recognized as a productive petroleum reservoir . The formation is overlain by the Pico Formation , both of the Neogene period . The Repetto Formation is equivalent in age to the Fernando Formation ; some researchers consider it (as well as the overlying Pico Formation ) to be a junior synonym based on benthic foraminifera stages. Other researchers maintain that
10-481: Is a stub . You can help Misplaced Pages by expanding it . Submarine fan Abyssal fans , also known as deep-sea fans , underwater deltas , and submarine fans , are underwater geological structures associated with large-scale sediment deposition and formed by turbidity currents . They can be thought of as an underwater version of alluvial fans and can vary dramatically in size, with widths from several kilometres to several thousands of kilometres. The largest
15-610: Is the Bengal Fan , followed by the Indus Fan , but major fans are also found at the outlet of the Amazon , Congo , Mississippi and elsewhere. Abyssal (or submarine) fans are formed from turbidity currents. These currents begin when a geologic activity pushes sediments over the edge of a continental shelf and down the continental slope , creating an underwater landslide. A dense slurry of muds and sands speeds towards
20-544: The Repetto and Pico Formations are distinct stratigraphic units, and that the use of the name "Fernando Formation" should be stopped due to several issues with stratigraphic correlation and access to the type section. This article about a specific stratigraphic formation in California is a stub . You can help Misplaced Pages by expanding it . This article about a specific United States geological feature
25-407: The foot of the slope, until the current slows. The decreasing current, having a reduced ability to transport sediments, deposits the grains it carries, thus creating a submarine fan. The slurry continues to slow as it is moved towards the continental rise until it reaches the ocean bed. Thus results a series of graded sediments of sand, silt and mud, which are known as turbidites , as described by
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