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Artificial-fill (latest Holocene)—Compacted and uncompacted silt, sand, MMand rock fragments Alluvium (Holocene)—Chiefly stream-channel deposits Flood-plain and stream-channel deposits (Holocene and late Pleistocene) MM—Chiefly gravel in a sand matrix Valley-fill deposits (Holocene and late Pleistocene)—Chiefly fine sand MMand silt in stream-terrace alluvium River-gravel deposits (late? and middle Pleistocene)—Chiefly gravel in a MMsand matrix Young fan-alluvium and debris-flow deposits (Holocene)—Chiefly silty MMsand and lenses of gravel Younger alluvial-slope deposits (late Pleistocene)—Chiefly silty sand and MMlenses of gravel Older alluvial-slope deposits (late Pleistocene)—Chiefly gravel layers and MMsilty sand layers Local gravel deposits (late? To middle Pleistocene)—Gravel consisting MMchiefly of locally derived clasts of metamorphic and igneous rocks Colluvium, undivided (Holocene and Late Pleistocene)—Gravel in a silty MMsand matrix derived from steep slopes Rockfall deposits (Holocene and late Pleistocene)—Boulders and associaMMted debris deposited chiefly at base of cliffs of Wingate Sandstone Younger landslide deposits (Holocene)—Mostly active earth-block slides MMon steep bluffs along the Colorado River Older landslide deposits (late to middle? Pleistocene)—Chiefly unstratiMMfied rock debris having hummocky topography and generally involving MMthe Brushy Basin Member of the Morrison Fromation and younger strata Sheetwash deposits (Holocene and late Pleistocene)—Light-gray sandy MMclay and silty clay deposited on very gentle slope north of the Colorado MMRiver, derived from the Mancos Shale Eolian sand (Holocene and late Pleistocene)—Wind-blown silty very fine MMto fine sand that commonly blankets the uplands Eolian sand and sheetwash deposits (Holocene and late Pleistocene)— MMChiefly silty very fine to fine sand that includes clasts of bedrock units MMexposed upslope Cienaga deposits (Holocene)—Silty sand chiefly of eolian and (or) sheetMMwash origin that accumulated in marshy areas Mancos Shale (Upper Cretaceous)—Chiefly medium-dark-gray, dark-gray, MMbrownish-gray, and brownish-black fissile shale that weathers light gray Dakota Formation (Upper and Lower? Cretaceous)—Sandstone and conMMglomerate that form prominent ridges and gray mudstone and minor coal Burro Canyon Formation (Lower Cretaceous)—Sandstone, pale-red and MMpale-green mudstone, and conglomerate Brushy Basin Member of the Morrison Formation (Upper Jurassic)— MMChiefly multicolored mudstone and minor sandstone that are commonly MMinvolved in landslides Salt Wash Member of the Morrison Formation (Upper Jurassic)—PromMMinent sandstone layers and intervening mudstone layers Tidwell Member of the Morrison Formation (Upper Jurassic)—MultiMMcolored mudstone, sandstone, and limestone Wanakah Formation (Middle Jurassic)—Lower red mudstone and upper MMgreenish gray mudstone; interbedded with thin sandstone "Board beds" unit of the Entrada Sandstone (Middle Jurassic)—InterMMbedded ledge-forming sandstone and slope-forming mudstone; MMan informal unit Slick Rock Member of the Entrada Sandstone (Middle Jurassic)— MMOrange-pink to pale-reddish-orange sandstone that weathers to form MMsmooth, rounded benches or cliffs Wanakah Formation and Entrada Sandstone, undivided (Middle MMJurassic)—In cross sections only Kayenta Formation (Lower Jurassic)—Chiefly reddish-orange sandstone, MMconglomerate, and mudstone that form a resistant cap on cliffs Wanakah Formation and Entrada Sandstone (Middle Jurassic) and MMKayenta Formation (Lower Jurassic), undivided Wingate Sandstone (Lower Jurassic)—Chiefly cross-bedded orange-pink MMto reddish-orange sandstone and minor mudrock that form major cliffs MMin the map area Chinle Formation (Upper Triassic)—Interbedded red mudstone, sandstone, MMconglomerate, and limestone Lamprophyre dikes (Middle Proterozoic)—Dark greenish gray to greenMMish black, containing biotite, hornblende, and pyroxene Meta-igneous gneiss (Early Proterozoic)—Biotite-bearing granitic rock MMhaving a weak foliation and locally containing large feldspar phenocrysts Migmatitic meta-sedimentary rocks (Early Proterozoic)—Chiefly a mixMMture of schist and migmatitic pegmatite Contact High-angle reverse fault—Dashed where approximately located, dotted MMwhere concealed, teeth on upthrown side, arrow and number indicate MMdip of fault plane Normal fault—Dashed where approximately located, dotted where conMMcealed, bar and ball on downthrown side; arrow and number indicate MMdip of fault plane, diamond and number indicate trend and plunge MMof slickenlines Area of alkali deposit on Cienaga deposits Breakaway scarp of landslide—Hachures face landslide Strike and dip of inclined beds Strike and dip of overturned beds Strike and dip of inclined bed—Calculated from map outcrop-pattern MMgeometry Horizontal beds—Calculated from map outcrop-pattern geometry Strike and dip of inclined foliation of metamorphic rocks Vertical foliation of metamorphic rocks Trend and plunge of fold axes or mineral lineations of metamorphic rocks Prospect pit Radiometric date sample location Hinge line Foot trail Ephemeral artificial pond Monument boundary [See accompanying pamphlet for detailed descriptions of map units and geologic history of Colorado National Monument]

Geologic map of Colorado National Monument and adjacent areas, Mesa County, Colorado