STRATIGRAPHY OF NORTH FLANK OF EASTERN UINTA MOUNTAINS AND SOUTHERN GREEN RIVER BASIN NORTH ICS TIME BEDROCK UNIT NAMES EPOCH AMERICAN (Millions of DOMINANT DEPOSITIONAL AGE and THICKNESS LITHOLOGY NOTES Years Ago) (not to scale) ERA (SERIES) AGE ROCK TYPE ENVIRONMENTS (STAGE) QUATERNARY DEPOSITS PERIOD (not to scale) (SYSTEM) (STAGE) (ERATHEM) Feet Meters Holocene Unconsolidated sand, silt, gravel, and 0.0117 Alluvium and colluvium 3-100 1-30 boulders; fine- to coarse-grained deposits Alpine glaciers in Uinta Mountains; Upper Eolian (wind-blown sand) deposits 16-30 5-10 in stream channels and on several levels capture of Green River by the Rancholabrean 0.126 of benches; landslides and slumps in Colorado River system within the last Pleistocene Landslide deposits thin to 160 thin to 50 unconsolidated and bedrock units suscep- 2 million years tible to failure on steep slopes and in some Irvingtonian Middle Glacial till-outwash and older alluvium 3-30 1-10 Quaternary active channels 0.781 Unconformity of about 1 million years 3 Piacanzian less than less than Pliocene Blancan 4 Unnamed gravel Sandstone, boulder conglomerate with ash 165 50 Zanclean 5 Unconformity of about 3 million years Hemphillian 8 Clarendonian Tortonian 12 Serravallian Barstovian 14 Miocene Langhian Sandstone, siltstone, mudstone, and basal Neogene Hemingfordian 16 Browns Park Formation 0-1640 0-500 boulder conglomerate with tuffaceous Crustal relaxation and collapse of Burdigalian beds and ash eastern Uinta Mountains; drainage N 20 patterns changed about 25 million years Aquitanian Arikareean 23 ago to the present configuration CENOZOIC Chattian 28 Local unconformity 30 Oligocene Whitneyan Sandstone and boulder conglomerate with Unconformity of about 13 million years; Tertiary Rupelian Bishop Conglomerate 0-490 0-150 ash Glibert Peak erosion surface formed Orellan 34 after the Laramide uplift ended 47 Lutetian Tuffaceous mudstone and sandstone with Known for abundant brontothere Bridgerian Bridger Formation 2760-3430 840-1045 lesser amounts of limestone 48 and turtle fossils Limestone, sandstone, shale, and oil shale Eocene Green River Formation 985-2720 300-830 Lake Gosiute; known for fossil fish and Wasatchian with some salt, gypsum, and trona beds Paleogene Ypresian trona deposits Clarkforkian Interbedded sandstone, siltstone, and 56 Wasatch Formation 2000-4000 610-1220 conglomerate; intertongues with overlying Green River Formation Tiffanian Thanetian Unconformity of about 10 million years; Paleocene 59 Fort Union Formation 1200-2300 365-700 Siltstone, sandstone, basal conglomerate, Tertiary-Cretaceous (TK) boundary and Torrejonian Selandian 62 some mudstone and few thin coal beds the extinction of non-avian dinosaurs 72 Mesaverde Ericson Sandstone Sandstone, siltstone, carbonaceous Laramide uplift of the Uinta Mountains Rock Springs Formation 1290-2350 393-715 begins Campanian Group Blair Formation mudstone, coal, and conglomerate 84 Santonian Baxter Shale 6200-6300 1890-1920 Mudstone, silty mudstone, and siltstone Upper 86 Giant marine reptiles swam in the Coniacian Western Interior Seaway 90 M Turonian Sandstone, carbonaceous mudstone, coal; Frontier Formation 170-190 50-60 large concretions in upper part 92 Tununk Shale; unconformity of about 3 million years at base Cenomanian 95 Cretaceous Siliceous shale 101 Mowry Shale 200-220 60-65 Contains fossil fish scales Albian 102? Dakota Formation 130-250 40-75 Sandstone, carbonaceous mudstone, coal 103? K-1 unconformity of about 1 million years 113 Lower Aptian Varicolored mudstone and soil carbonate 125 Cedar Mountain Formation 0-195 0-60 (calcrete) beds forming nodules Emergence of flowering plants Barremian 129 K-0 unconformity of about 16 million years N 145 Tithonian Upper varicolored mudstone; lower sand- 152 Morrison Formation 600-745 180-230 Contains abundant dinosaur remains Kimmeridgian stone, siltstone, thin pebble conglomerate 157 J-5(?) unconformity of about 2 million years Upper 159 Oxfordian Stump Formation 145-280 45-85 Mudstone, limestone, glauconitic sandstone Contains belemnite fossils T 163 164 J-3 unconformity of about 1 million years Callovian Entrada Sandstone 160-245 50-75 Fine-grained, cross-bedded sandstone N MESOZOIC 166 R Middle Bathonian Mudstone and siltstone with lower limestone 168 Carmel Formation 275-400 85-125 or sandstone Bajocian Contains Isocrinus crinoid fossils T 170 Jurassic J-1 unconformity about 4 million years Toarcian 174 183 Pliensbachian Lower 191 Nugget Sandstone 655-885 200-270 Fine-grained sandstone with large-scale Sinemurian trough and planar cross-beds Ancient sand dunes 199 Hettangian 201 Rhaetian N 209 ? ? Mudstone and siltstone with rippled Unconformity of unknown duration Upper Norian Chinle Formation 230-370 70-110 sandstone at top and pebble conglomerate Gartra Member; contains fossil wood; 227 (Gartra Member) at base ^-3 unconformity of about 10 million Carnian 237 years at base Olenekian 247 Triassic 251 Moenkopi Formation 750-830 230-255 Interbedded siltstone, sandstone, mudstone Contains abundant trace fossils and Lower ripple marks Induan Dinwoody Formation 380-530 115-160 Shale, siltstone, sandstone, some limestone R 252 ^ 265 -1 unconformity of about 13 million years Guadalupian Wordian Guadalupian Upper sandy limestone and dolomite (Middle) 269 with mudstone, siltstone, and sandstone Roadian Park City and Phosphoria Formations 330-425 100-130 Contains phosphate and marine deposits T 272 and lower sandy limestone and dolomite Kungurian separated by phosphatic shale Leonardian 284 Cisuralian Artinskian Permian 289 Unconformity of about 3 million years (Lower) Sakmarian 292 Wolfcampian 295 Asselian Fine-grained sandstone with thin limestone Forms cliffs and Tower Rock in Sheep 299 Weber Sandstone 1017-1550 310-475 interbeds in lower part N Virgilian Gzhelian Creek Canyon Geological Area Upper 304 Missourian Kasimovian 307 Desmoinesian Interbedded shale, siltstone, cherty Middle Moscovian Morgan Formation 500-965 150-295 limestone R Atokan 315 PALEOZOIC Lower Morrowan Bashkirian Round Valley Limestone 275-445 85-135 Cherty limestone Forms ledges, contains jasperized T Pennsylvanian marine fossils 323 Doughnut Shale 345-545 105-165 Carbonaceous shale and thin limestone Upper Serpukhovian R Chesterian Humbug Formation 295-380 90-115 Interbedded sandstone, shale, limestone 331 Upper (Deseret Limestone equivalent) Forms cliffs, contains marine fossils Middle Meramecian Visean and lower thick-bedded cherty limestone Deseret Limestone equivalent 347 separated by thin-bedded shaley Osagean Madison Limestone 920-1100 280-335 limestone (Delle Phosphatic Member Delle Phosphatic Member equivalent Lower Tournaisian equivalent); sinkholes and caves (karst) T Mississippian Kinderhookian 359 in the upper limestone Unconformity of about 126 million years; 485 marine sand deposited in low areas Sandstone and pebble sandstone Upper Cambrian Lodore Formation 0-590 0-180 Unconformity of about 140 million years; 501 uplift of ancestral Uinta Mountains and 642 Red Pine Shale 1800-3940 550-1200 Shale and arkosic sandstone erosion creating a rolling landscape Quartz sandstone, shale, thin pebble formation of Hades Pass 5900-7220 1800-2200 conglomerate and arkosic sandstone Forms the exposed core of the Uinta Quartz sandstone and some thin beds Mountains; ancient faulted basin Middle formation of Crouse Canyon 4200-8860 1280-2700 of shale repeatedly flooded by marine waters M that contained single-celled and early colonial microfossils formation of Outlaw Trail 165-330 50-100 Shale and arkosic sandstone Cryogenian formation of Diamond Breaks 1600-3200 485-975 Quartz sandstone and orthoquartzite Uinta Mountain Group Unconformity of about 800 million years NEOPROTEROZOIC Conglomerate and shale 770 Jesse Ewing Canyon Formation 740-1640 225-500 1600 T = Marine transgression Metamorphosed rocks R = Marine regression as much as as much as N = Non-marine PALEOPROTEROZOIC Red Creek Quartzite Metaquartzite, mica schist, amphibolite M = Marine trangression 20,000 6100 and regression cycles with intervening non-marine deposition Red line denotes an unconformity (no rock record preserved); two numbers give time gap. REFERENCES International Commissison on Stratigraphy (ICS) age (stage) names and rounded time values are from Cohen and others (2013); North American age (stage) names and correlation are from Berggren and others (1985), Rohde (2005), Heckel and Clayton (2006), and Menning and others (2006). Berggren, W.A., Kent, D.V., Flynn, J.J., and Van Couvering, J.A., 1985, Cenozoic geochronology: Geological Society of America Bulletin, v. 96, no. 11, p. 1407-1418. Cohen, K.M., Finney, S.C., Gibbard, P.L., and Fan, J., 2013, The ICS international chronostratigraphic chart: Episodes, v. 36, no. 3, p. 199-204. Heckel, P.H., and Clayton, G., 2006, The Carboniferous System—use of the new official names for the subsystems, series, and stages: Geologica Acta, v. 4, no. 3, p. 403-407. Menning, M., Alekseev, A.S., Chuvashov, B.I., Davydov, V.I., Devuyst, F.-X., Forke, H.C., Grunt, T.A., Hance, L., Heckel, P.H., Izokh, N.G., Jin, Y.-G., Jones, P.J., Kotlyar, G.V., Kozur, H.W., Nemyrovska, T.I., Schneider, J.W., Wang, X.-D., Weddige, K., Weyer, D., and Work, D.M., 2006, Global time scale and regional stratigraphic reference scales of Central and West Europe, East Europe, Tethys, South China, and North America as used in the Devonian–Carboniferous–Permian Correlation Chart 2003 (DCP 2003): Palaeogeography, Palaeoclimatology, Palaeoecology, v. 240, no. 1-2, p. 318-372. Rohde, R.A.,