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NARROW
Format
Article Type
Journal
Publisher
Section
GeoRef Subject
-
all geography including DSDP/ODP Sites and Legs
-
Africa
-
East Africa
-
Kenya
-
Lake Magadi (1)
-
-
Lake Natron (1)
-
Turkana Basin (1)
-
-
East African Lakes
-
Lake Albert (1)
-
Lake Magadi (1)
-
Lake Natron (1)
-
Lake Tanganyika (1)
-
-
North Africa
-
Algeria (1)
-
-
Sahara (1)
-
-
Asia
-
Far East
-
Borneo
-
Kalimantan Indonesia
-
Mahakam Delta (1)
-
-
-
China
-
Hubei China
-
Jianghan Basin (1)
-
-
Ordos Basin (1)
-
Qaidam Basin (1)
-
Qinghai China (1)
-
Songliao Basin (1)
-
Xinjiang China
-
Junggar Basin (2)
-
-
-
Indonesia
-
Kalimantan Indonesia
-
Mahakam Delta (1)
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-
-
Mongolia (1)
-
-
-
Canada
-
Western Canada
-
British Columbia (1)
-
-
-
Europe
-
Alps
-
Eastern Alps
-
Dolomites
-
Latemar Massif (1)
-
-
-
-
Central Europe
-
Germany
-
Hesse Germany
-
Messel Germany (2)
-
-
Rhineland-Palatinate Germany (1)
-
-
-
Southern Europe
-
Italy
-
Trentino-Alto Adige Italy
-
Latemar Massif (1)
-
-
-
-
Western Europe
-
France
-
Paris Basin (1)
-
-
United Kingdom
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Great Britain
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England (1)
-
-
-
-
-
Green River (2)
-
Green River basin (17)
-
Lake Victoria (1)
-
Malay Archipelago
-
Borneo
-
Kalimantan Indonesia
-
Mahakam Delta (1)
-
-
-
-
North America
-
Basin and Range Province
-
Great Basin (1)
-
-
Rocky Mountains
-
U. S. Rocky Mountains
-
Absaroka Range (1)
-
Uinta Mountains (4)
-
-
-
Rocky Mountains foreland (1)
-
Western Interior (1)
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Western Overthrust Belt (1)
-
-
Sand Wash Basin (1)
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Seymour Island (1)
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South America
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Argentina (1)
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Brazil (1)
-
-
United States
-
Absaroka Fault (1)
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Book Cliffs (2)
-
California
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Central California (1)
-
San Joaquin Valley (1)
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-
Colorado
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Colorado mineral belt (2)
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Delta County Colorado (1)
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Garfield County Colorado
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Anvil Points Mine (2)
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Rifle Colorado (2)
-
-
Larimer County Colorado (1)
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Mahogany Zone (5)
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Moffat County Colorado (2)
-
Park County Colorado (1)
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Piceance Basin (3)
-
Rio Blanco County Colorado (9)
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Teller County Colorado
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Florissant Fossil Beds National Monument (1)
-
-
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Colorado Plateau (4)
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Florida (1)
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Great Basin (1)
-
Idaho
-
Shoshone County Idaho (1)
-
-
Montana (1)
-
Nevada
-
Nye County Nevada (1)
-
-
New Jersey
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Middlesex County New Jersey (1)
-
-
Paradox Basin (1)
-
Powder River basin (1)
-
Sevier orogenic belt (2)
-
Texas (1)
-
U. S. Rocky Mountains
-
Absaroka Range (1)
-
Uinta Mountains (4)
-
-
Uinta Basin (56)
-
Uncompahgre Uplift (1)
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Utah
-
Box Elder County Utah (1)
-
Carbon County Utah (4)
-
Duchesne County Utah (9)
-
Emery County Utah
-
Emery Utah (1)
-
-
Grand County Utah (1)
-
Juab County Utah (1)
-
Millard County Utah (1)
-
Sanpete County Utah (2)
-
Sevier County Utah (2)
-
Uintah County Utah (12)
-
Wasatch County Utah (1)
-
Wasatch Plateau (1)
-
-
Washakie Basin (7)
-
Washington
-
Ferry County Washington (2)
-
-
Western U.S. (11)
-
Wyoming
-
Lincoln County Wyoming (12)
-
Rock Springs Uplift (2)
-
Sweetwater County Wyoming (22)
-
Uinta County Wyoming (3)
-
-
-
Willow Creek (1)
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Wind River (1)
-
-
commodities
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bitumens
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asphalt (2)
-
-
brines (6)
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energy sources (7)
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metal ores
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uranium ores (1)
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-
mineral deposits, genesis (4)
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mineral resources (1)
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oil and gas fields (10)
-
petroleum
-
natural gas
-
shale gas (1)
-
-
shale oil (1)
-
-
sodium carbonate (3)
-
tight sands (1)
-
-
elements, isotopes
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carbon
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C-13/C-12 (8)
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C-14 (1)
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organic carbon (2)
-
-
hydrogen (3)
-
isotope ratios (12)
-
isotopes
-
radioactive isotopes
-
C-14 (1)
-
-
stable isotopes
-
C-13/C-12 (8)
-
He-3 (1)
-
N-15/N-14 (1)
-
O-18/O-16 (10)
-
S-34/S-32 (1)
-
Sr-87/Sr-86 (3)
-
-
-
metals
-
actinides
-
uranium (1)
-
-
alkaline earth metals
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calcium (1)
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magnesium (2)
-
strontium
-
Sr-87/Sr-86 (3)
-
-
-
aluminum (1)
-
iron (2)
-
manganese (1)
-
nickel (1)
-
rare earths (1)
-
titanium (1)
-
-
nitrogen
-
N-15/N-14 (1)
-
-
noble gases
-
helium
-
He-3 (1)
-
-
-
oxygen
-
O-18/O-16 (10)
-
-
phosphorus (1)
-
sulfur
-
S-34/S-32 (1)
-
-
-
fossils
-
bacteria (2)
-
Chordata
-
Vertebrata
-
Pisces
-
Osteichthyes
-
Actinopterygii
-
Teleostei (3)
-
-
-
-
Tetrapoda
-
Aves
-
Archaeornithes
-
Archaeopteryx (1)
-
-
Neornithes (2)
-
-
Mammalia
-
Theria
-
Eutheria
-
Perissodactyla (1)
-
-
-
-
Reptilia
-
Diapsida
-
Archosauria (1)
-
Lepidosauria
-
Squamata
-
Lacertilia (2)
-
-
-
-
-
-
-
-
coprolites (2)
-
ichnofossils (4)
-
Invertebrata
-
Arthropoda
-
Mandibulata
-
Crustacea
-
Branchiopoda (1)
-
Malacostraca (1)
-
Ostracoda (5)
-
-
Insecta
-
Pterygota
-
Neoptera
-
Endopterygota
-
Coleoptera (2)
-
Diptera (1)
-
-
Exopterygota
-
Orthoptera (1)
-
-
-
-
-
-
-
Mollusca
-
Bivalvia
-
Palaeoheterodonta
-
Unionidae (1)
-
-
-
Gastropoda (4)
-
-
Vermes (1)
-
-
microfossils (10)
-
palynomorphs (1)
-
Plantae
-
algae
-
Chlorophyta (1)
-
-
Spermatophyta
-
Angiospermae
-
Dicotyledoneae (1)
-
-
-
-
thallophytes (4)
-
tracks (2)
-
trails (2)
-
-
geochronology methods
-
Ar/Ar (9)
-
K/Ar (2)
-
paleomagnetism (2)
-
tephrochronology (3)
-
U/Pb (2)
-
-
geologic age
-
Cenozoic
-
lower Cenozoic (1)
-
Quaternary
-
Holocene (1)
-
Pleistocene (1)
-
upper Quaternary
-
Pinedale Glaciation (1)
-
-
-
Tertiary
-
Florissant Lake Beds (2)
-
lower Tertiary (1)
-
Neogene
-
Browns Park Formation (1)
-
Miocene (6)
-
-
Paleogene
-
Duchesne River Formation (4)
-
Eocene
-
Bridger Formation (2)
-
Bridgerian (4)
-
Colton Formation (2)
-
Green River Formation (236)
-
Lake Gosiute (24)
-
Lake Uinta (12)
-
lower Eocene
-
Wasatchian (4)
-
Willwood Formation (1)
-
-
middle Eocene
-
Laney Shale Member (14)
-
-
Parachute Creek Member (9)
-
upper Eocene
-
La Meseta Formation (1)
-
Uinta Formation (8)
-
-
Wilkins Peak Member (19)
-
-
Flagstaff Formation (1)
-
Oligocene
-
Fish Canyon Tuff (1)
-
-
Paleocene
-
lower Paleocene
-
K-T boundary (1)
-
-
Tongue River Member (1)
-
upper Paleocene
-
Clarkforkian (1)
-
Tiffanian (1)
-
-
-
Wasatch Formation (18)
-
-
-
-
Mesozoic
-
Cretaceous
-
Lower Cretaceous
-
Lagoa Feia Formation (1)
-
-
Mancos Shale (3)
-
Upper Cretaceous
-
Almond Formation (1)
-
Gulfian
-
Eagle Ford Formation (1)
-
-
K-T boundary (1)
-
Mesaverde Group (2)
-
Williams Fork Formation (1)
-
-
-
Jurassic
-
Arapien Shale (1)
-
Carmel Formation (1)
-
Oxford Clay (1)
-
Solnhofen Limestone (1)
-
Upper Jurassic
-
Haynesville Formation (1)
-
Morrison Formation (1)
-
Oxfordian (1)
-
-
-
Triassic
-
Moenkopi Formation (1)
-
Upper Triassic
-
Chinle Formation (1)
-
Yanchang Formation (1)
-
-
-
upper Mesozoic (1)
-
-
Paleozoic
-
Carboniferous
-
Mississippian
-
Barnett Shale (2)
-
-
Pennsylvanian
-
Middle Pennsylvanian
-
Paradox Formation (1)
-
-
-
-
Devonian
-
Middle Devonian
-
Marcellus Shale (1)
-
-
Upper Devonian
-
Huron Member (1)
-
Ohio Shale (1)
-
-
-
Permian
-
Park City Formation (1)
-
-
upper Paleozoic
-
Bakken Formation (1)
-
-
Weber Sandstone (1)
-
Woodford Shale (1)
-
-
Precambrian
-
Uinta Mountain Group (2)
-
upper Precambrian
-
Proterozoic
-
Mesoproterozoic
-
Belt Supergroup (1)
-
-
-
-
-
-
igneous rocks
-
igneous rocks
-
volcanic rocks
-
basalts (1)
-
glasses (1)
-
pyroclastics
-
tuff (14)
-
-
-
-
volcanic ash (1)
-
-
metamorphic rocks
-
turbidite (1)
-
-
minerals
-
carbonates
-
aragonite (1)
-
calcite (3)
-
dawsonite (2)
-
dolomite (6)
-
Iceland spar (1)
-
nahcolite (3)
-
norsethite (1)
-
trona (11)
-
-
halides
-
chlorides
-
halite (3)
-
-
fluorides
-
neighborite (1)
-
-
-
minerals (19)
-
organic minerals
-
ozocerite (1)
-
-
oxides
-
iron oxides (1)
-
nordstrandite (1)
-
-
phosphates
-
apatite (1)
-
-
silicates
-
aluminosilicates (1)
-
chain silicates
-
amphibole group
-
clinoamphibole
-
arfvedsonite (1)
-
-
-
leucosphenite (1)
-
-
framework silicates
-
feldspar group
-
alkali feldspar
-
K-feldspar (2)
-
sanidine (6)
-
-
plagioclase
-
albite (2)
-
-
-
nepheline group
-
nepheline (1)
-
-
sodalite group
-
lazurite (1)
-
-
zeolite group
-
analcime (3)
-
clinoptilolite (1)
-
mordenite (1)
-
-
-
orthosilicates
-
nesosilicates
-
zircon group
-
zircon (2)
-
-
-
-
ring silicates (1)
-
sheet silicates
-
chlorite group
-
chlorite (1)
-
-
clay minerals
-
montmorillonite (2)
-
smectite (1)
-
stevensite (1)
-
-
illite (3)
-
mica group
-
biotite (4)
-
-
talc (1)
-
-
-
sulfates
-
lazurite (1)
-
-
sulfides
-
lazurite (1)
-
pyrite (1)
-
-
-
Primary terms
-
absolute age (11)
-
Africa
-
East Africa
-
Kenya
-
Lake Magadi (1)
-
-
Lake Natron (1)
-
Turkana Basin (1)
-
-
East African Lakes
-
Lake Albert (1)
-
Lake Magadi (1)
-
Lake Natron (1)
-
Lake Tanganyika (1)
-
-
North Africa
-
Algeria (1)
-
-
Sahara (1)
-
-
Asia
-
Far East
-
Borneo
-
Kalimantan Indonesia
-
Mahakam Delta (1)
-
-
-
China
-
Hubei China
-
Jianghan Basin (1)
-
-
Ordos Basin (1)
-
Qaidam Basin (1)
-
Qinghai China (1)
-
Songliao Basin (1)
-
Xinjiang China
-
Junggar Basin (2)
-
-
-
Indonesia
-
Kalimantan Indonesia
-
Mahakam Delta (1)
-
-
-
Mongolia (1)
-
-
-
bacteria (2)
-
biogeography (3)
-
bitumens
-
asphalt (2)
-
-
brines (6)
-
Canada
-
Western Canada
-
British Columbia (1)
-
-
-
carbon
-
C-13/C-12 (8)
-
C-14 (1)
-
organic carbon (2)
-
-
Cenozoic
-
lower Cenozoic (1)
-
Quaternary
-
Holocene (1)
-
Pleistocene (1)
-
upper Quaternary
-
Pinedale Glaciation (1)
-
-
-
Tertiary
-
Florissant Lake Beds (2)
-
lower Tertiary (1)
-
Neogene
-
Browns Park Formation (1)
-
Miocene (6)
-
-
Paleogene
-
Duchesne River Formation (4)
-
Eocene
-
Bridger Formation (2)
-
Bridgerian (4)
-
Colton Formation (2)
-
Green River Formation (236)
-
Lake Gosiute (24)
-
Lake Uinta (12)
-
lower Eocene
-
Wasatchian (4)
-
Willwood Formation (1)
-
-
middle Eocene
-
Laney Shale Member (14)
-
-
Parachute Creek Member (9)
-
upper Eocene
-
La Meseta Formation (1)
-
Uinta Formation (8)
-
-
Wilkins Peak Member (19)
-
-
Flagstaff Formation (1)
-
Oligocene
-
Fish Canyon Tuff (1)
-
-
Paleocene
-
lower Paleocene
-
K-T boundary (1)
-
-
Tongue River Member (1)
-
upper Paleocene
-
Clarkforkian (1)
-
Tiffanian (1)
-
-
-
Wasatch Formation (18)
-
-
-
-
chemical analysis (4)
-
Chordata
-
Vertebrata
-
Pisces
-
Osteichthyes
-
Actinopterygii
-
Teleostei (3)
-
-
-
-
Tetrapoda
-
Aves
-
Archaeornithes
-
Archaeopteryx (1)
-
-
Neornithes (2)
-
-
Mammalia
-
Theria
-
Eutheria
-
Perissodactyla (1)
-
-
-
-
Reptilia
-
Diapsida
-
Archosauria (1)
-
Lepidosauria
-
Squamata
-
Lacertilia (2)
-
-
-
-
-
-
-
-
clay mineralogy (5)
-
climate change (2)
-
coprolites (2)
-
crystal chemistry (1)
-
crystal growth (2)
-
crystal structure (3)
-
data processing (2)
-
deformation (4)
-
diagenesis (13)
-
ecology (2)
-
economic geology (36)
-
electron microscopy (1)
-
energy sources (7)
-
environmental geology (1)
-
Europe
-
Alps
-
Eastern Alps
-
Dolomites
-
Latemar Massif (1)
-
-
-
-
Central Europe
-
Germany
-
Hesse Germany
-
Messel Germany (2)
-
-
Rhineland-Palatinate Germany (1)
-
-
-
Southern Europe
-
Italy
-
Trentino-Alto Adige Italy
-
Latemar Massif (1)
-
-
-
-
Western Europe
-
France
-
Paris Basin (1)
-
-
United Kingdom
-
Great Britain
-
England (1)
-
-
-
-
-
faults (6)
-
folds (2)
-
fractures (6)
-
geochemistry (26)
-
geochronology (1)
-
geomorphology (3)
-
geophysical methods (8)
-
ground water (2)
-
heat flow (3)
-
hydrogen (3)
-
hydrogeology (1)
-
hydrology (1)
-
ichnofossils (4)
-
igneous rocks
-
volcanic rocks
-
basalts (1)
-
glasses (1)
-
pyroclastics
-
tuff (14)
-
-
-
-
inclusions
-
fluid inclusions (1)
-
-
Invertebrata
-
Arthropoda
-
Mandibulata
-
Crustacea
-
Branchiopoda (1)
-
Malacostraca (1)
-
Ostracoda (5)
-
-
Insecta
-
Pterygota
-
Neoptera
-
Endopterygota
-
Coleoptera (2)
-
Diptera (1)
-
-
Exopterygota
-
Orthoptera (1)
-
-
-
-
-
-
-
Mollusca
-
Bivalvia
-
Palaeoheterodonta
-
Unionidae (1)
-
-
-
Gastropoda (4)
-
-
Vermes (1)
-
-
isotopes
-
radioactive isotopes
-
C-14 (1)
-
-
stable isotopes
-
C-13/C-12 (8)
-
He-3 (1)
-
N-15/N-14 (1)
-
O-18/O-16 (10)
-
S-34/S-32 (1)
-
Sr-87/Sr-86 (3)
-
-
-
Malay Archipelago
-
Borneo
-
Kalimantan Indonesia
-
Mahakam Delta (1)
-
-
-
-
mantle (1)
-
maps (2)
-
Mesozoic
-
Cretaceous
-
Lower Cretaceous
-
Lagoa Feia Formation (1)
-
-
Mancos Shale (3)
-
Upper Cretaceous
-
Almond Formation (1)
-
Gulfian
-
Eagle Ford Formation (1)
-
-
K-T boundary (1)
-
Mesaverde Group (2)
-
Williams Fork Formation (1)
-
-
-
Jurassic
-
Arapien Shale (1)
-
Carmel Formation (1)
-
Oxford Clay (1)
-
Solnhofen Limestone (1)
-
Upper Jurassic
-
Haynesville Formation (1)
-
Morrison Formation (1)
-
Oxfordian (1)
-
-
-
Triassic
-
Moenkopi Formation (1)
-
Upper Triassic
-
Chinle Formation (1)
-
Yanchang Formation (1)
-
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
Green River Formation
Potential for Events Similar to the Deadly West Salt Creek Landslide, Grand Mesa Area, Colorado
High-resolution X-ray fluorescence-based provenance mapping of Eocene fluvial distributary fans that fed ancient Gosiute Lake, Wyoming, USA
Dolomite mineralogy as a proxy record for lake level fluctuations: a case study from the Eocene Uteland Butte Member of the Green River Formation, Uinta Basin, Utah, U.S.A.
Environmental and microbial influence on chemistry and dolomite formation in an ancient lake, Green River Formation (Eocene), Uinta basin, Utah, U.S.A.
Astronomical and tectonic influences on climate and deposition revealed through radioisotopic geochronology and Bayesian age-depth modeling of the early Eocene Green River Formation, Wyoming, USA
Influence of lake-basin morphology on climate-sediment transfer functions: Early Eocene Wilkins Peak Member, Green River Formation, Wyoming
The supply-generated sequence: A unified sequence-stratigraphic model for closed lacustrine sedimentary basins with evidence from the Green River Formation, Uinta Basin, Utah, U.S.A.
A Comparison of Geological Characteristics of the Main Continental Shale Oil in China and the U.S.
ABSTRACT The Uinta Basin of eastern Utah is an intermontane basin that contains an ~2-km-thick succession of mostly carbonate-rich mudrock assigned to the Eocene Green River Formation. In the southwest part of the basin, along Nine Mile Canyon and its tributary canyons, the middle member of the Green River Formation contains numerous interbedded sand bodies. Previous researchers have interpreted these sand bodies variably as lacustrine deltaic mouth bars, terminal fluvial distributary bars, and various types of fluvial (delta plain/floodplain/braid plain) bar. Using some modern western U.S. lakes as partial analogues, and taking into account the overall lacustrine basin context of a widely fluctuating, wave-influenced, alkaline-lake shoreline, we again interpret many of the sand bodies to be fluvial in origin. Several sand bodies both truncate and are capped by brown to red-maroon and variegated weak to noncalcareous mudstone with root and desiccation structures, indicating terrestrial deposition well away from the lake shoreline. Others display steep cutbanks from which noncalcareous, inclined heterolithic stratification laterally accreted as fluvial side bars. Utilizing helicopter-based light detection and ranging (LiDAR) data, we investigated additional sand bodies that may be better examples of deltaic mouth bars. In contrast to the more commonly documented highstand progradational mouth bars of marine and open lake settings, these sand bodies are interpreted to have originated as late-lowstand or transgressive system tract fluvial channels that were then flooded and modified by waves following lake transgression. These examples illustrate that any large-scale sandy bed form present in the general vicinity of a closed basin’s fluctuating lake shore may be expected to have formed under more than one set of environmental conditions. A revised set of guidelines is therefore presented to aid in the interpretation of lacustrine deltaic mouth bars.
Depositional system and lake-stage control on microbialite morphology, Green River Formation, eastern Uinta Basin, Colorado and Utah, U.S.A.
Lacustrine cyclicity in the early Eocene Green River Formation, Uinta Basin, Utah: Evidence from X-ray fluorescence core scanning
ABSTRACT Scanning electron microscopy (SEM) has revolutionized our understanding of shale petroleum systems through microstructural characterization of dispersed organic matter (OM). However, as a result of the low atomic weight of carbon, all OM appears black in SEM (BSE [backscattered electron] image) regardless of differences in thermal maturity or OM type (kerogen types or solid bitumen). Traditional petrographic identification of OM uses optical microscopy, where reflectance (%R o ), form, relief, and fluorescence can be used to discern OM types and thermal maturation stage. Unfortunately, most SEM studies of shale OM do not employ correlative optical techniques, leading to misidentifications or to the conclusion that all OM (i.e., kerogen and solid bitumen) is the same. To improve the accuracy of SEM identifications of dispersed OM in shale, correlative light and electron microscopy (CLEM) was used during this study to create optical and SEM images of OM in the same fields of view (500× magnification) under white light, blue light, secondary electron (SE), and BSE conditions. Samples ( n = 8) of varying thermal maturities and typical of the North American shale petroleum systems were used, including the Green River Mahogany Zone, Bakken Formation, Ohio Shale, Eagle Ford Formation, Barnett Formation, Haynesville Formation, and Woodford Shale. The CLEM image sets demonstrate the importance of correlative microscopy by showing how easily OM can be misidentified when viewed by SEM alone. Without CLEM techniques, petrographic data from SEM such as observations of organic nanoporosity may be misinterpreted, resulting in false or ambiguous results and impairing an improved understanding of organic diagenesis and catagenesis.
When “evaporites” are not formed by evaporation: The role of temperature and p CO 2 on saline deposits of the Eocene Green River Formation, Colorado, USA
The Aspen paleoriver: Linking Eocene magmatism to the world’s largest Na-carbonate evaporite (Wyoming, USA)
Climate impact on fluvial-lake system evolution, Eocene Green River Formation, Uinta Basin, Utah, USA
Understanding and distinguishing reflectance measurements of solid bitumen and vitrinite using hydrous pyrolysis: Implications to petroleum assessment
Common-reflection-surface method in weakly anisotropic vertical transverse isotropic media
Oil, bitumen, and other confusing concepts: What do lab experiments really tell us?
Abstract Green River Formation lacustrine deposits in the eastern portion of Lake Uinta formed in two sub-basins (the Piceance basin and the Uinta basin) and represent mixed siliciclastic-carbonate and organic-rich lake deposits deposited during the Eocene climate optimum. The formation is comprised of organic-rich and organic-poor mudstone, siliciclastics, and carbonates, formed in a shallow to deep (tens of meters), stratified lake environment. Integrated sequence stratigraphic analysis using gamma logs, Fisher Assay plots, core, and outcrop has resulted in a predictive framework for organic-rich oil shale distribution, reservoir characterization, and hydrocarbon systems analysis. Lacustrine strata are characterized by three types of (meter to decimeter) depositional cycles: (1) Type 1 cycles formed in a littoral/sublittoral zones and comprise progradational siliciclastic-rich deposits that pass upward into progradational to aggradational carbonate shoal and microbial carbonate and are capped by mud-to silt-sized sublittoral deposits. In the profundal zone, two types of depositional cycles occur: (2) Type 2 cycles start with lean oil shale, pass upwards into siliciclastic turbidites, and are overlain by rich oil shale deposits. (3) Type 3 cycles initiate with evaporites and mixed lean and rich oil shale that is overlain by rich oil shale. Stacked depositional cycles form depositional sequences meters to tens of meters thick. Eleven upward-deepening depositional sequences have been described and are divided into periods of low, rising, and high lake that are separated by sequence boundaries, transgressive surfaces, and main flooding surfaces, respectively. The development of depositional cycles and sequences in these lacustrine basins appear to be strongly affected by climate changes and respective inflow; i.e., during times of low inflow (low lake level) siliciclastic and nutrient input into the lake decreased. In contrast, the highest input of siliciclastics and nutrients occurred during increased and high inflow (rising and high lake level). Low lake level is marked by thin marginal deposits and lean oil shale and at times, evaporite deposition in profundal areas. Increased runoff is marked along basin margins by sharp-based sandstones and carbonates. In the profundal area, rich oil shale overlay lean oil shale.