ESCI 536 - Rocky Mountains FT Precambrian-Cambrian Stratigraphy & Paleogeography: North American Cordillera February 3, 2010 J. Morgan.

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ESCI Rocky Mountains FT Precambrian-Cambrian Stratigraphy & Paleogeography: North American Cordillera February 3, 2010 J. Morgan

Precambrian Crystalline Basement & Belt Supergroup (Stewart & Suczec, 1977) m.y m.y.

Diamictite & Volcanic Sequences (Stewart & Suczec, 1977) m.y.

m.y m.y. (Stewart & Suczec, 1977) m.y m.y m.y. Shallow water carbonates Shallow water terrigenous sediments Local diamictite, volcanics & more Proterozoic basement Belt supergroup (correlative)

Stratigraphy PC: Crystalline rocks UPC: Discontinuous, locally up to 3000 m of diamictite, mudstone, sandstone, cgl, & mafic volcanics UPC-LC: Westward thickening wedge, locally > 6000 m, of terrigenous detrital rocks MC-UC: Predominantly shallow water carbonates, up to 2000 m thick Belt Supergroup (N Cordielleran)

Precambrian & Cambrian Stratigraphy (Stewart & Suczec, 1977)

Late Precambrian-Cambrian Evolution, Western NA (Stewart & Suczec, 1977) Late Precambrian rifting (850 m.a.)

Stratigraphy PC: Crystalline rocks UPC: Discontinuous, locally up to 3000 m of diamictite, mudstone, sandstone, cgl, & mafic volcanics UPC-LC: Westward thickening wedge, locally > 6000 m, of terrigenous detrital rocks MC-UC: Predominantly shallow water carbonates, up to 2000 m thick Craton Deposition in local rift valleys Rapid erosion of uplifted rift margins Accumulation on subsided shallow-water shelf

Lower Paleozoic Rifted Margin

Laramide Reactivation of Basement Structures

Inherited Structural Trends Cotton- wood Canyon