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1. • • It is a mixed sedimentary and volcanic unit whose base is an erosional unconformity. The unit consists of 3 parts: First is a basal marine conglomeratic sandstone, followed by a dominantly basaltic middle layer of multiple submarine lava flows and tuffs.
     kids.kiddle.co/Los_Angeles_Basin

     Los Angeles Basin facts for kids - Kids encyclopedia

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   What did the LA River look like before development?

   • Los Angeles Times (August 14, 1994). Before development, the LA basin was likely characterized by a mix of coastal sage scrub, valley grasslands, swaths of Southern California oak, and seasonal wetlands. 8 The historic ecology of the LA River is not well studied of documented.

   Natural History: Basin Formation, River ... - LA River Master Plan

   larivermasterplan.org/about/river-history/natural-history-basin-formation-river-hydrology-and-native-species/

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   Where is the Los Angeles Basin located?

   • The Los Angeles Basin, along with the Santa Barbara Channel, the Ventura Basin, the San Fernando Valley, and the San Gabriel Basin, lies within the greater Southern California region. [ 2 ] The majority of the jurisdictional land area of the city of Los Angeles physically lies within this basin.

   Los Angeles Basin - Wikipedia

   en.wikipedia.org/wiki/Los_Angeles_Basin

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   How did the Los Angeles basins get so deep?

   • Gravity, water and wind act like sandpaper, wearing down the mountains, and carrying the debris into the basins. Over time, the basins have been filled with sediment. The bowl-shaped basin of rock under Los Angeles is up to five miles (8km) deep, filled with a mixture of gravel, sand and clay.

   The weird way the Los Angeles basin alters earthquakes - BBC

   www.bbc.com/future/article/20240816-california-earthquakes-why-the-los-angeles-basin-is-like-a-bowl-of-jelly

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   Why are the San Gabriel and San Bernardino basins so important?

   • The low seismic velocities and concave shapes of these basins—the San Gabriel and the San Bernardino—tend to trap energy and channel it toward the downtown Los Angeles area, which leads to larger ground motions.

   Exposing Los Angeles’s Shaky Geologic Underbelly - Eos

   eos.org/science-updates/exposing-los-angeless-shaky-geologic-underbelly

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   What makes the Los Angeles Basin a giant bowl of jelly?

   • Put another way, imagine the Los Angeles basin as a giant bowl of jelly – the dense rocky mountains and underlying rock make up the bowl, while the sediment fill is represented by the gelatinous mixture. "If you shake the bottom [of the bowl] a little bit, the top flops back and forth quite a bit," says Vidale.

   The weird way the Los Angeles basin alters earthquakes - BBC

   www.bbc.com/future/article/20240816-california-earthquakes-why-the-los-angeles-basin-is-like-a-bowl-of-jelly

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   Is Los Angeles in a lowland basin?

   • The majority of the jurisdictional land area of the city of Los Angeles physically lies within this basin. On the north, northeast, and east, the lowland basin is bound by the Santa Monica Mountains and Puente, Elysian, and Repetto hills. [ 3 ]

   Los Angeles Basin - Wikipedia

   en.wikipedia.org/wiki/Los_Angeles_Basin

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3. www.bbc.com › future › articleThe weird way the Los Angeles basin alters earthquakes - BBC

   www.bbc.com › future › article

   Aug 18, 2024 · Scientists from the Statewide California Earthquake Center simulated earthquakes in the Los Angeles region and found that the basin can trap seismic wave energy in a similar way.

4. kids.kiddle.co › Los_Angeles_BasinLos Angeles Basin facts for kids - Kids encyclopedia

   kids.kiddle.co › Los_Angeles_Basin

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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.

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6. en.wikipedia.org › wiki › Los_Angeles_BasinLos Angeles Basin - Wikipedia

   en.wikipedia.org › wiki › Los_Angeles_Basin

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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.

7. biodiversityla.org › environment › geologyGeology – Biodiversity Atlas of LA

   biodiversityla.org › environment › geology

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   Geology. Most of Los Angeles County is dominated by alluvium (44%), which occurs in the lowlands area in the Los Angeles Basin and Mojave Basin. Sedimentary sandstone (19%), igneous grandodiorite (14%), and metamorphic gneiss (7%) also cover a significant area of Los Angeles.

8. Videos

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     Tour a 3D map of 1890 Los Angeles Basin

     7 Jun 2017

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     How Plate Tectonics Transformed Los Angeles

     21 Jul 2022

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     LA is Transforming its Concrete River - here's why

     26 Aug 2022

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9. eos.org › science-updates › exposing-los-angelessExposing Los Angeles’s Shaky Geologic Underbelly - Eos

   eos.org › science-updates › exposing-los-angeless

   Oct 10, 2019 · The black outline marks the San Gabriel and San Bernardino basins. Pink lines are the major faults in the area. The small red polygon shows the location of the tall buildings shown in the photo of...

10. larivermasterplan.org › about › river-historyNatural History: Basin Formation, River Hydrology, and Native ...

    larivermasterplan.org › about › river-history

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    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.

11. lalandscapehistory.orgLos Angeles Landscape History – Historical Ecology of the LA ...

    lalandscapehistory.org

    LA Landscape History is a collaborative project to build a comprehensive knowledge base about the historical ecology of the Los Angeles Basin and environs. It was launched in 2018 with a two-year study funded by the John Randolph Haynes and…