- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
NARROW
GeoRef Subject
-
all geography including DSDP/ODP Sites and Legs
-
Colorado River (1)
-
Front Range (1)
-
North America
-
Great Plains
-
Northern Great Plains (1)
-
-
Rocky Mountains
-
Southern Rocky Mountains (3)
-
U. S. Rocky Mountains
-
Laramie Mountains (3)
-
Medicine Bow Mountains (46)
-
-
-
-
Platte River basin (1)
-
Sierra Madre (3)
-
United States
-
Cheyenne Belt (11)
-
Colorado
-
Jackson County Colorado (2)
-
-
Denver Basin (1)
-
Montana (1)
-
Mullen Creek-Nash Fork shear zone (1)
-
Nebraska (1)
-
Nevada
-
Elko County Nevada
-
Independence Mountains (1)
-
-
-
North Dakota (1)
-
South Dakota (1)
-
U. S. Rocky Mountains
-
Laramie Mountains (3)
-
Medicine Bow Mountains (46)
-
-
Washakie Basin (1)
-
Wyoming
-
Albany County Wyoming (11)
-
Carbon County Wyoming (12)
-
Converse County Wyoming (1)
-
Fremont County Wyoming (1)
-
Hanna Basin (1)
-
Laramie Basin (1)
-
Laramie County Wyoming (1)
-
Natrona County Wyoming (1)
-
Sierra Madre Range (3)
-
-
Wyoming Province (5)
-
-
-
commodities
-
metal ores
-
copper ores (2)
-
gold ores (1)
-
palladium ores (1)
-
platinum ores (2)
-
polymetallic ores (2)
-
-
mineral deposits, genesis (2)
-
oil and gas fields (1)
-
petroleum (1)
-
-
elements, isotopes
-
carbon
-
C-14 (1)
-
-
isotopes
-
radioactive isotopes
-
C-14 (1)
-
-
stable isotopes
-
Ne-21 (1)
-
-
-
metals
-
actinides
-
thorium (1)
-
uranium (1)
-
-
platinum group
-
palladium ores (1)
-
platinum ores (2)
-
-
-
nitrogen (1)
-
noble gases
-
neon
-
Ne-21 (1)
-
-
-
-
fossils
-
Chordata
-
Vertebrata
-
Pisces
-
Chondrichthyes
-
Elasmobranchii (1)
-
-
-
Tetrapoda
-
Mammalia
-
Theria
-
Eutheria
-
Artiodactyla (1)
-
Carnivora (1)
-
Lagomorpha (1)
-
Perissodactyla (1)
-
Rodentia (1)
-
-
-
-
Reptilia
-
Diapsida
-
Archosauria
-
dinosaurs
-
Ornithischia
-
Ceratopsia
-
Ceratopsidae
-
Triceratops (1)
-
-
-
-
-
-
-
-
-
-
-
ichnofossils (1)
-
Metazoa (1)
-
microfossils (1)
-
palynomorphs
-
miospores
-
pollen (1)
-
-
-
Plantae (1)
-
-
geochronology methods
-
exposure age (1)
-
lichenometry (1)
-
Nd/Nd (1)
-
paleomagnetism (2)
-
Pb/Pb (1)
-
Rb/Sr (1)
-
Sm/Nd (1)
-
U/Pb (3)
-
-
geologic age
-
Cenozoic
-
Quaternary
-
Holocene (1)
-
Pleistocene
-
upper Pleistocene
-
Wisconsinan (1)
-
-
-
upper Quaternary (2)
-
-
Tertiary
-
Neogene
-
Browns Park Formation (1)
-
Miocene
-
Ash Hollow Formation (1)
-
-
-
Paleogene
-
Eocene
-
upper Eocene
-
Chadronian (1)
-
-
-
Hanna Formation (2)
-
Oligocene
-
lower Oligocene (1)
-
-
Paleocene
-
Ludlow Member (1)
-
Tullock Member (1)
-
-
White River Group (3)
-
-
-
-
Mesozoic
-
Cretaceous
-
Upper Cretaceous
-
Hell Creek Formation (1)
-
Lance Formation (1)
-
Laramie Formation (1)
-
Mesaverde Group (1)
-
-
-
-
Paleozoic
-
Permian (1)
-
-
Precambrian
-
Archean (5)
-
Laramie anorthosite complex (1)
-
upper Precambrian
-
Proterozoic
-
Paleoproterozoic (5)
-
-
-
-
-
igneous rocks
-
igneous rocks
-
plutonic rocks
-
anorthosite (1)
-
granites (3)
-
granodiorites (1)
-
monzonites (1)
-
-
-
-
metamorphic rocks
-
metamorphic rocks
-
amphibolites (2)
-
gneisses
-
paragneiss (1)
-
-
metasedimentary rocks
-
metagraywacke (1)
-
paragneiss (1)
-
-
metavolcanic rocks (4)
-
migmatites (1)
-
mylonites (2)
-
quartzites (1)
-
schists (1)
-
-
-
minerals
-
carbonates (1)
-
minerals (1)
-
oxides
-
baddeleyite (1)
-
magnetite (1)
-
-
phosphates
-
apatite (1)
-
-
silicates
-
chain silicates
-
amphibole group
-
clinoamphibole
-
hornblende (1)
-
-
-
-
framework silicates
-
feldspar group
-
plagioclase
-
albite (1)
-
-
-
-
orthosilicates
-
nesosilicates
-
titanite group
-
titanite (1)
-
-
zircon group
-
zircon (3)
-
-
-
sorosilicates
-
epidote group
-
clinozoisite (1)
-
epidote (1)
-
-
-
-
sheet silicates
-
chlorite group
-
chlorite (1)
-
-
-
-
-
Primary terms
-
absolute age (6)
-
carbon
-
C-14 (1)
-
-
Cenozoic
-
Quaternary
-
Holocene (1)
-
Pleistocene
-
upper Pleistocene
-
Wisconsinan (1)
-
-
-
upper Quaternary (2)
-
-
Tertiary
-
Neogene
-
Browns Park Formation (1)
-
Miocene
-
Ash Hollow Formation (1)
-
-
-
Paleogene
-
Eocene
-
upper Eocene
-
Chadronian (1)
-
-
-
Hanna Formation (2)
-
Oligocene
-
lower Oligocene (1)
-
-
Paleocene
-
Ludlow Member (1)
-
Tullock Member (1)
-
-
White River Group (3)
-
-
-
-
chemical analysis (1)
-
Chordata
-
Vertebrata
-
Pisces
-
Chondrichthyes
-
Elasmobranchii (1)
-
-
-
Tetrapoda
-
Mammalia
-
Theria
-
Eutheria
-
Artiodactyla (1)
-
Carnivora (1)
-
Lagomorpha (1)
-
Perissodactyla (1)
-
Rodentia (1)
-
-
-
-
Reptilia
-
Diapsida
-
Archosauria
-
dinosaurs
-
Ornithischia
-
Ceratopsia
-
Ceratopsidae
-
Triceratops (1)
-
-
-
-
-
-
-
-
-
-
-
climate change (1)
-
crust (4)
-
crystal growth (1)
-
crystallography (1)
-
deformation (9)
-
economic geology (2)
-
epeirogeny (1)
-
faults (12)
-
folds (5)
-
foliation (2)
-
geochronology (5)
-
geomorphology (2)
-
geophysical methods (5)
-
glacial geology (4)
-
hydrology (1)
-
ichnofossils (1)
-
igneous rocks
-
plutonic rocks
-
anorthosite (1)
-
granites (3)
-
granodiorites (1)
-
monzonites (1)
-
-
-
inclusions
-
fluid inclusions (1)
-
-
intrusions (5)
-
isotopes
-
radioactive isotopes
-
C-14 (1)
-
-
stable isotopes
-
Ne-21 (1)
-
-
-
lineation (1)
-
maps (3)
-
Mesozoic
-
Cretaceous
-
Upper Cretaceous
-
Hell Creek Formation (1)
-
Lance Formation (1)
-
Laramie Formation (1)
-
Mesaverde Group (1)
-
-
-
-
metal ores
-
copper ores (2)
-
gold ores (1)
-
palladium ores (1)
-
platinum ores (2)
-
polymetallic ores (2)
-
-
metals
-
actinides
-
thorium (1)
-
uranium (1)
-
-
platinum group
-
palladium ores (1)
-
platinum ores (2)
-
-
-
metamorphic rocks
-
amphibolites (2)
-
gneisses
-
paragneiss (1)
-
-
metasedimentary rocks
-
metagraywacke (1)
-
paragneiss (1)
-
-
metavolcanic rocks (4)
-
migmatites (1)
-
mylonites (2)
-
quartzites (1)
-
schists (1)
-
-
metamorphism (2)
-
metasomatism (2)
-
mineral deposits, genesis (2)
-
mineralogy (1)
-
minerals (1)
-
Mohorovicic discontinuity (1)
-
nitrogen (1)
-
noble gases
-
neon
-
Ne-21 (1)
-
-
-
North America
-
Great Plains
-
Northern Great Plains (1)
-
-
Rocky Mountains
-
Southern Rocky Mountains (3)
-
U. S. Rocky Mountains
-
Laramie Mountains (3)
-
Medicine Bow Mountains (46)
-
-
-
-
oil and gas fields (1)
-
orogeny (1)
-
paleobotany (1)
-
paleoclimatology (1)
-
paleoecology (2)
-
paleogeography (2)
-
paleomagnetism (2)
-
paleontology (4)
-
Paleozoic
-
Permian (1)
-
-
palynomorphs
-
miospores
-
pollen (1)
-
-
-
paragenesis (1)
-
petroleum (1)
-
petrology (3)
-
Plantae (1)
-
plate tectonics (4)
-
Precambrian
-
Archean (5)
-
Laramie anorthosite complex (1)
-
upper Precambrian
-
Proterozoic
-
Paleoproterozoic (5)
-
-
-
-
reefs (2)
-
sea-level changes (1)
-
sedimentary rocks
-
chemically precipitated rocks
-
evaporites
-
salt (1)
-
-
-
clastic rocks
-
conglomerate (2)
-
-
-
sedimentary structures
-
biogenic structures
-
bioherms (1)
-
stromatolites (2)
-
-
primary structures (1)
-
-
sedimentation (3)
-
sediments
-
clastic sediments
-
gravel (2)
-
till (2)
-
-
-
soils
-
Podzols (1)
-
-
stratigraphy (9)
-
structural analysis (2)
-
structural geology (8)
-
tectonics (9)
-
tectonophysics (1)
-
United States
-
Cheyenne Belt (11)
-
Colorado
-
Jackson County Colorado (2)
-
-
Denver Basin (1)
-
Montana (1)
-
Mullen Creek-Nash Fork shear zone (1)
-
Nebraska (1)
-
Nevada
-
Elko County Nevada
-
Independence Mountains (1)
-
-
-
North Dakota (1)
-
South Dakota (1)
-
U. S. Rocky Mountains
-
Laramie Mountains (3)
-
Medicine Bow Mountains (46)
-
-
Washakie Basin (1)
-
Wyoming
-
Albany County Wyoming (11)
-
Carbon County Wyoming (12)
-
Converse County Wyoming (1)
-
Fremont County Wyoming (1)
-
Hanna Basin (1)
-
Laramie Basin (1)
-
Laramie County Wyoming (1)
-
Natrona County Wyoming (1)
-
Sierra Madre Range (3)
-
-
Wyoming Province (5)
-
-
-
rock formations
-
Fort Union Formation (1)
-
-
sedimentary rocks
-
sedimentary rocks
-
chemically precipitated rocks
-
evaporites
-
salt (1)
-
-
-
clastic rocks
-
conglomerate (2)
-
-
-
volcaniclastics (1)
-
-
sedimentary structures
-
sedimentary structures
-
biogenic structures
-
bioherms (1)
-
stromatolites (2)
-
-
primary structures (1)
-
-
-
sediments
-
sediments
-
clastic sediments
-
gravel (2)
-
till (2)
-
-
-
volcaniclastics (1)
-
-
soils
-
paleosols (1)
-
soils
-
Podzols (1)
-
-
Medicine Bow Mountains
Detrital cosmogenic 21 Ne records decoupling of source-to-sink signals by sediment storage and recycling in Miocene to present rivers of the Great Plains, Nebraska, USA
Estimating snow water equivalent over long mountain transects using snowmobile-mounted ground-penetrating radar
Postglacial vegetation history of southeastern Wyoming, U.S.A.
A new view of an old suture zone: Evidence for sinistral transpression in the Cheyenne belt
Abstract The Paleogene sedimentary deposits of the Colorado Headwaters Basin provide a detailed proxy record of regional deformation and basin subsidence during the Laramide orogeny in north-central Colorado and southern Wyoming. This field trip presents extensive evidence from sedimentology, stratigraphy, structure, palynology, and isotope geochronology that shows a complex history that is markedly different from other Laramide synorogenic basins in the vicinity. We show that the basin area was deformed by faulting and folding before, during, and after deposition of the Paleogene rocks. Internal unconformities have been identified that further reflect the interaction of deformation, subsidence, and sedimentation. Uplift of Proterozoic basement blocks that make up the surrounding mountain ranges today occurred late in basin history. Evidence is given to reinterpret the Independence Mountain uplift as the result of significant normal faulting (not thrusting), probably in middle Tertiary time. While the Denver and Cheyenne Basins to the east were subsiding and accumulating sediment during Late Cretaceous time, the Colorado Headwaters Basin region was experiencing vertical uplift and erosion. At least 1200 m of the upper part of the marine Upper Cretaceous Pierre Shale was regionally removed, along with Fox Hills Sandstone shoreline deposits of the receding Interior Seaway as well as any Laramie Formation–type continental deposits. Subsidence did not begin in the Colorado Headwaters Basin until after 60.5 Ma, when coarse, chaotic, debris-flow deposits of the Paleocene Windy Gap Volcanic Member of the Middle Park Formation began to accumulate along the southern basin margin. These volcaniclastic conglomerate deposits were derived from local, mafic-alkalic volcanic sources (and transitory deposits in the drainage basin), and were rapidly transported into a deep lake system by sediment gravity currents. The southern part of the basin subsided rapidly (roughly 750–1000 m/m.y.) and the drainage system delivered increasing proportions of arkosic debris from uplifted Proterozoic basement and more intermediate-composition volcanic-porphyry materials from central Colorado sources. Other margins of the Colorado Headwaters Basin subsided at slightly different times. Subsidence was preceded by variable amounts of gentle tilting and localized block-fault uplifts. The north-central part of the basin that was least-eroded in early Paleocene time was structurally inverted and became the locus of greatest subsidence during later Paleocene-Eocene time. Middle Paleocene coal-mires formed in the topographically lowest eastern part of the basin, but the basin center migrated to the western side by Eocene time when coal was deposited in the Coalmont district. In between, persistent lakes of variable depths characterized the central basin area, as evidenced by well-preserved deltaic facies. Fault-fold deformation within the Colorado Headwaters Basin strongly affected the Paleocene fluvial-lacustrine deposits, as reflected in the steep limbs of anticline-syncline pairs within the McCallum fold belt and the steep margins of the Breccia Spoon syncline. Slivers of Proterozoic basement rock were also elevated on steep reverse faults in late Paleocene time along the Delaney Butte–Sheep Mountain–Boettcher Ridge structure. Eocene deposits, by and large, are only gently folded within the Colorado Headwaters Basin and thus reflect a change in deformation history. The Paleogene deposits of the Colorado Headwaters Basin today represent only a fragment of the original extent of the depositional basin. Basal, coarse conglomerate deposits that suggest proximity to an active basin margin are relatively rare and are limited to the southern and northwestern margins of the relict basin. The northeastern margin of the preserved Paleogene section is conspicuously fine-grained, which indicates that any contemporaneous marginal uplift was far removed from the current extent of preserved fluvial-lacustrine sediments. The conspicuous basement uplifts of Proterozoic rock that flank the current relict Paleogene basin deposits are largely post-middle Eocene in age and are not associated with any Laramide synuplift fluvial deposits. The east-west–trending Independence Mountain fault system that truncates the Colorado Headwaters Basin on the north with an uplifted Proterozoic basement block is reinterpreted in this report. Numerous prior analyses had concluded that the fault was a low-angle, south-directed Laramide thrust that overlapped the northern margin of the basin. We conclude instead that the fault is more likely a Neogene normal fault that truncates all prior structure and belongs to a family of sub-parallel west-northwest–trending normal faults that offset upper Oligocene-Miocene fluvial deposits of the Browns Park–North Park Formations.
A late Eocene (Chadronian) mammalian fauna from the White River Formation in Kings Canyon, northern Colorado
Testing the transpression hypothesis in the western part of the Cheyenne belt, Medicine Bow Mountains, southeastern Wyoming
P - and S -Wave Receiver Function Images of Crustal Imbrication beneath the Cheyenne Belt in Southeast Wyoming
Reworked Cretaceous elasmobranch teeth and provenance of the Paleocene Hanna Formation (Hanna Basin, Wyoming)
The 1.76-Ga Horse Creek anorthosite complex, Wyoming : A massif anorthosite emplaced late in the Medicine Bow orogeny
Neogene normal faulting superposed on a Laramide uplift; Medicine Bow Mountains, Sierra Madre, and intervening Saratoga Valley, Wyoming and Colorado
Medicine Bow orogeny : Timing of deformation and model of crustal structure produced during continent-arc collision, ca. 1.78 Ga, southeastern Wyoming
Structure and Kinematic Genesis of the Quealy Wrench Duplex: Transpressional Reactivation of the Precambrian Cheyenne Belt in the Laramie Basin, Wyoming
Cataclastic deformation mechanism for the development of core-mantle structures in amphibole
Identification of 2.0 to 2.4 Ga Nd model age crustal material in the Cheyenne belt, southeastern Wyoming: Implications for Proterozoic accretionary tectonics at the southern margin of the Wyoming craton
Cenozoic history of the Saratoga Valley area, Wyoming and Colorado
Modeling of aeromagnetic data from the Precambrian Lake Owens mafic complex, Wyoming
Fluid-inclusions evidence for the physical and chemical conditions associated with intermediate-temperature PGE mineralization at the New Rambler Deposit, southeastern Wyoming
Early Oligocene paleovalleys in southern and central Wyoming: Evidence of high local relief on the late Eocene unconformity
A review of the geology and structure of the Cheyenne belt and Proterozoic rocks of southern Wyoming
The Colorado Proterozoic province is separated from Archean rocks of the Wyoming province by a major structural boundary, the Cheyenne belt. Proterozoic rocks south of the Cheyenne belt are exposed in the Sierra Madre, Medicine Bow Mountains, and Laramie Range of southern Wyoming. They consist of metavolcanic units, metagraywacke, pelitic schist and gneiss, amphibolite, and felsic to mafic intrusive rocks that locally resemble rocks of central Colorado. North of the Cheyenne belt, Archean granite and gneiss of the Wyoming craton are overlain by a Late Archean and Early Proterozoic supracrustal sequence that contains quartzite, metadolomite, phyllite, and subordinate metavolcanic rocks. The eugeoclinal character of the metamorphic rocks south of the Cheyenne belt contrasts sharply with the dominantly siliciclastic supracrustal rocks north of the Cheyenne belt. Although specific sequences south of the belt have not yet been correlated between the Sierra Madre, Medicine Bow Mountains, and Laramie Range, similarities in age, lithology, and major element chemistry suggest that they are part of a single geologic terrane. Macroscopic structure and microscopic kinematic indicators within the Cheyenne belt suggest that accretion of the Proterozoic rocks of northern Colorado to the Archean Wyoming craton was accomplished primarily by large-scale thrusting. Following accretion of individual thrust blocks, the boundary zone was steepened by folding and reactivated locally during a period of strike-slip movement. Presence of similar lithologies and shear zones south of the Cheyenne belt suggests that the southern margin of the Wyoming craton may have been a long-lived zone of crustal accretion.