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Geologic units containing landslide

Arizona

Cretaceous to Late Jurassic sedimentary rocks with minor volcanic rocks (Late Jurassic to Cretaceous)

Sandstone and conglomerate, rarely forms prominent outcrops; massive conglomerate is typical near base of unit and locally in upper part. These deposits are nonmarine except in southeastern Arizona, where prominent gray marine limestone (Mural Limestone) forms the middle of the Bisbee Group. Sandstones are typically medium-bedded, drab brown, lithic-feldspathic arenites. Includes Bisbee Group (largely Early Cretaceous) and related rocks, Temporal, Bathtub, and Sand Wells formations, rocks of Gu Achi, McCoy Mountains Formation, and Upper Cretaceous Fort Crittenden Formation and equivalent rocks. (80-160 Ma)

Middle Miocene to Oligocene sedimentary rocks (Oligocene to Middle Miocene)

Con-glomerate, sandstone, mudstone, limestone, and rock-avalanche breccia (sheet-like deposits of crushed rock) deposited and tilted during widespread normal faulting and basin development. Sediments, mostly conglomerate and sandstone, are commonly medium to dark brown, reddish brown, or brownish gray; younger strata are generally lighter colors. Most deposits are 20 to 30 Ma in southeastern Arizona and 15 to 25 Ma in central and western Arizona. (11-32 Ma)

California

Quaternary large landslide deposits (Quaternary)

Selected large landslides, such as Blackhawk slide on north side of San Gabriel Mountains; early to late Quaternary.

Colorado

Landslide deposits (Phanerozoic | Cenozoic | Quaternary)

Locally includes talus, rock-glacier, and thick colluvial deposits

North Dakota

Landslides (Phanerozoic | Cenozoic | Quaternary )

Landslides

New Mexico

landslide deposits and colluvium (Phanerozoic | Cenozoic | Quaternary)

Landslide deposits and colluvium

Nevada

Breccia (Middle Eocene to Early Pliocene)

BRECCIA-Volcanic, thrust, and jasperoid breccia and landslide megabreccia

Landslide deposits (Quaternary)

LANDSLIDE DEPOSITS

Tuffaceous sedimentary rocks (Early Oligocene to Early Miocene)

TUFFACEOUS SEDIMENTARY ROCKS-Locally includes minor amounts of tuff

Oregon

Landslide and debris-flow deposits (Holocene and Pleistocene) (Pleistocene to Holocene)

Unstratified mixtures of fragments of adjacent bedrock. Locally includes slope wash and colluvium. Largest slides and debris flows occur where thick sections of basalt and andesite flows overlie clayey tuffaceous rocks. May include some deposits of late Pliocene age

Texas

land slide deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene)

land slide deposits

Utah

Quaternary landslides (Quaternary)

Washington

Landslide and mudflow deposits (Holocene)

Predominantly landslide debris. Includes till-like mudflow deposits of andesitic rock fragments in clayey sand matrix in Buckley-Enumclaw area of Kind and Pierce Counties.

Wyoming

Landslide deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene)

LANDSLIDE DEPOSITS--Locally includes intermixed landslide and glacial deposits, talus, and rock-glacier deposits.

Undivided surficial deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene)

UNDIVIDED SURFICIAL DEPOSITS--Mostly alluvium, colluvium, and glacial and landslide deposits. Primarily in Yellowstone area and Bighorn Mountains.