|
i
<br /> ' 2ible 6-1. Dock Formations Exposed in the Mscla Area. SmIduluft—eolaram
<br /> i
<br /> system Series Stratigraphic Unit Thickness Character
<br /> (Feet)
<br /> - Holocene 0-20 Talus alluvium, and wind-deposited material
<br /> a«o„u,}
<br /> Pleistocene 0-200 Talus, landslide deposits (in part of Holocene Age), fanglamerate, lake bads,
<br /> and undifferentiated stream deposits.
<br /> tertiary (?) Pliocene (?) Lt=nforTn ty 1 Gravel Apo of pebbles and boulders of pozphyrit c igneous rock.
<br /> Unoonfoamity
<br /> Mesaverde (2) Thick-bedded yellowinh-gray sandstone and light-gray shale.
<br /> Formation
<br /> Upper
<br /> Mancos Shale 2 000* Dark--gray fissile shale.
<br /> Cretaceous Dakota 70-220 Yellow lenticular sandstone and conglomerate; interbedded carbonaceous shale
<br /> Sandstdne and impure coal.
<br /> U nconfoanity
<br /> Burro Canyon 50-300 White, gray, and red sandstone and conglammerate; interbedded green and
<br /> Lower Formation reddish-purple shale.
<br /> 300-750 Brushy Basin Member; variegated bentonitic shale and mrdstcne; rusty-red and
<br /> Morrison red sandstone and conglomerate; local thin limestone beds.
<br /> Formation
<br /> 240-440 Salt Wash Member; white, gray, buff, and rusty-red sandstone; red, reddish-
<br /> brown, green, and gray mudstone, scattered thin limestone beds.
<br /> Jurassic Upper
<br /> Summerville 0-100 Thin-bedded red, gray, green, and brown sardstonne, sandy shale, and mudstone.
<br /> Formation
<br /> San 0-225 Slick Rock Member; orange, buff, and white fine gained massive and cross-
<br /> Pafael Entrada bedded sandstone.
<br /> Croup Sansto ne
<br /> 0-100 Dewey Bridge member; red, buff, and orange horizontally bedded mdstone,
<br /> siltstone, and sandstone.
<br /> Unoornfon pity
<br /> Nava)o 0-500f Buff and gray crossbedded fine-grained sandstone.
<br /> Sandstone
<br /> Triassic (?) Upper Glen Rayenta 0-300 ��lartlyy,bedded t�, buff, , and lavender of conglomerate
<br /> Canyon Formation A few
<br /> Group
<br /> Wingate 0-500 Fine-grained reddish-brown thick-bedded, massive, and csossbedded
<br /> Sandstone cliff-foaming sandstone.
<br /> Chinle 0-750 Red to orange-red siltstone with interbedded lenses of red sandstone, shale,
<br /> Upper Formation and limestone-pebble and clay-pellet conglomerate. Lenses of quarts-pebble
<br /> conglomerate and grit at the base.
<br /> Triassic UnoonformitY
<br /> Middle (?) G-500 Upper member; chocolate-brain ripple-bedded shale; thin lenses of arkosic
<br /> sandstone.
<br /> Lower Moesnkopi 0-290 Middle member; chocolate-brown arkose, arkosic conglomerate, and ripple-
<br /> Format-ion bedded shale.
<br /> Triassic (?) 0-300 Loos member; reddish- to yellowish-brown ;n,d�ly bedded poorly sorted
<br /> mudstone. Local gypsum beds near base.
<br /> Unconformity
<br /> Permian Cutler 0-9,000+ Maroon, red, light-red-.mottled, and purple conglomerate, arkose, and arkosic
<br /> Formation sandstone; thin beds of sandy mudstone.
<br /> Upper Rico 0-150? Maroon, red, light-red-mottled, and purple conglomerate, arkose, and arkosic
<br /> and Formation sandstone; interbedded red and gray marine limestone.
<br /> Middle
<br /> Pennsylvanian local uunoonformity
<br /> Middle Hermosa 2,000-2,200 Limestone member; gray fossiliferous lamest-one and thin beds of shale; minor
<br /> Formation arkose.
<br /> (2) Paradox Member: sandstone, arkose, carbOnaceous shale, 13^IMStOne, gypsum,
<br /> and salt.
<br /> Precambrian Unconformity ? Volcanic and metamorphic crystalline rocks, including gneiss, schist,
<br /> granite, and pegmatite.
<br /> (Ref: Cater, 1970)
<br /> 6-6
<br />
|