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monzonite to granodioric~. <br />Crean River Formation (Eocene): pr,•i,ubly caLcarruus siltstonu and <br />ahaley marls [one (Hail, 1Y7~). 1hr furmatioo, obscured by surliclal <br />material, is aub~ect to mass-w~y~~ng prucessos. <br />Tor Ohio Creek Wasatch Formations (E,~oenu and Paleocene): vari-colored <br />(usually red, purple, green, y~lluw, and gray} mudstone and <br />eiltatorte with Interbedded medium-gray, lenticular sandstone and <br />conglomeratic sandstone. The iormtiou generally is obscured by <br />surficial deposits, is prune [u mass-wasting, and is potentially <br />unstable. <br />Kav Mesaverde Formation (late Cretaceous): brown, gray, and Ligt,c gray <br />to white sandstone interbedded witl~ dark gray shale. Couimurclally <br />important coal beds occur in the lower part of the formation. 1'l~e <br />formation forms very steep slopes which are sub,)ect to rockfalls <br />and other mass-wasting processes. in many places these steep <br />slopes are stable. <br />Ka Mancos Shale (late Cretaceous): a dark brown to gray laminated <br />silty shale which is prone to erosion and mass-wasting especially <br />where mantled by thin coliuvium. 'The shale locally contains <br />swelling clays (montmorillonite) and water corrosive to concrete. <br />Flash floods and mudflows occur along drainages that traverse [tie <br />ttancos Shale. <br />db Dakota-Burro Can on Formations ~ear1Y to Latu Cretaceous): light <br />gray to brown sandstone, silt:;tone, and cungolmerate with some <br />dark gray shale. The unit forms titccp sLopcs that generally are <br />SCdbl@. <br />F-35 <br />Rev. 1: 6-18-81 <br />