Langlois, Coos Co., Oregon, USA

Age: Pleistocene (0 - 2.588 Ma)

Description: Unconsolidated deposits of gravel, cobbles, and boulders intermixed and locally interlayered with clay, silt, and sand. Mostly on terraces and pediments above present flood plains. Includes older alluvium of Smith and others (1982) in the Klamath Mountains and both high- and low-level terraces along Oregon coast. Includes dissected alluvial fan deposits northeast of Lebanon, and Linn and Leffler Gravels of Allison and Felts (1956)

Comments: In OR291, includes terrace levels 60 m and 20-30 m above Grande Ronde Valley floor. Lower terrace dated as Pleistocene based on radiocarbon date of a mammoth tooth of 15,280+180 yr B.P. In OR292, includes a terrace that stands 20 m above the modern valley floor along the south side of the Umatilla River. Gravel also deposited above the present channel of the middle reach of the Umatilla River

Lithology: Major:{gravel,boulders,clay}, Minor:{silt,sand}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Age: Pleistocene (0.0117 - 2.588 Ma)

Description: Middle marine terrace deposits; 40ft thick; unconsolidated rocks; mixed grained sediments; fluvial; thin; mixed grains

Lithology: Major:: {marine terrace}

Reference: R.L. Smith, W.P. Roe (compilers). Oregon Geologic Data Compilation, release 6. State of Oregon Department of Geology and Mineral Industries. [20]

Age: Mesozoic (66 - 201.3 Ma)

Stratigraphic Name: Franciscan Complex

Comments: metamorphic protolith: mafic volcanics

Lithology: Shale

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]