Interim geologic map of the Ogden 30' x 60' quadrangle, Box Elder, Cache, Davis, Morgan, Rich, and Summit Counties, Utah, and Uinta County, Wyoming

Coogan, James C.; King, Jon K.

doi:10.34191/ofr-653dm

Cited by 2 publications

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“…The Monte Cristo paleodepth transect lies within the eastern part of the sheet and contains a west dipping panel of thinner Neoproterozoic to Pennsylvanian strata above the frontal ramp of the Willard thrust, with imbricated Triassic to Middle Jurassic strata exposed in the footwall (Figure ). The panel is unconformably capped by flat‐lying Paleogene strata (Coogan & King, ). The sampling transect spans Upper Cambrian to Neoproterozoic strata, with estimated maximum stratigraphic burial depths of z ms = 7.4 to 9.3 km, based on a 4‐km thickness of Triassic to Jurassic strata (Figure ).…”

Section: Thermochronometric Data and Resultsmentioning

confidence: 99%

“…The Bear River Range paleodepth transect lies within the central part of the Willard thrust sheet and exposes Neoproterozoic to Pennsylvanian strata along the NNE plunging Browns Hole anticline and Logan Peak syncline that lies in the footwall of the Providence thrust (Figure ; Coogan & King, ; Dover, ). These folded strata are locally capped with angular unconformity by flat‐lying Eocene strata.…”

Section: Thermochronometric Data and Resultsmentioning

confidence: 99%

“…The Willard thrust sheet, and associated Paris and Meade thrust sheets to the north, had a protracted deformation and exhumation history based on crosscutting relations, characteristics of synorogenic strata, and limited apatite fission track data, but details of slip history are uncertain. The Willard thrust cuts Middle Jurassic strata along its frontal trace, whereas flat‐lying Paleocene to Early Eocene strata locally overlie eastern to central parts of the sheet (Coogan & King, ; Dover, ), broadly bracketing the timing of deformation. The mostly Aptian (125–113 Ma) lower part of the Gannett Group may record early slip on the Paris thrust, but the age of basal strata and their relation to thrusting are debated (Armstrong & Oriel, ; Heller et al, ).…”

Section: Geologic Settingmentioning

confidence: 99%

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Fault Slip and Exhumation History of the Willard Thrust Sheet, Sevier Fold‐Thrust Belt, Utah: Relations to Wedge Propagation, Hinterland Uplift, and Foreland Basin Sedimentation

et al. 2019

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Zircon (U‐Th)/He (ZHe) and zircon fission track thermochronometric data for 47 samples spanning the areally extensive Willard thrust sheet within the western part of the Sevier fold‐thrust belt record enhanced cooling and exhumation during major thrust slip spanning approximately 125–90 Ma. ZHe and zircon fission track age‐paleodepth patterns along structural transects and age‐distance relations along stratigraphic‐parallel traverses, combined with thermo‐kinematic modeling, constrain the fault slip history, with estimated slip rates of ~1 km/Myr from 125 to 105 Ma, increasing to ~3 km/Myr from 105 to 92 Ma, and then decreasing as major slip was transferred onto eastern thrusts. Exhumation was concentrated during motion up thrust ramps with estimated erosion rates of ~0.1 to 0.3 km/Myr. Local cooling ages of approximately 160–150 Ma may record a period of regional erosion, or alternatively an early phase of limited (<10 km) thrust slip. Propagation of the Sevier wedge front and major thrust slip during the late Early to mid‐Cretaceous were synchronous with increasing subsidence and deposition of thick synorogenic strata in the foreland, crustal thickening in the hinterland, growing igneous activity in the Sierran magmatic arc, and increasing plate convergence rates. Along‐strike, other parts of the Cordilleran retroarc fold‐thrust belt also experienced major shortening during the late Early to mid‐Cretaceous, following a period of earlier Cretaceous quiescence. Late Jurassic shortening was concentrated nearer the arc, and thus mostly in the hinterland at the latitude of northern Utah, related to width and location of the passive‐margin sedimentary wedge relative to the plate margin.

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Section: Thermochronometric Data and Resultsmentioning

confidence: 99%

Section: Thermochronometric Data and Resultsmentioning

confidence: 99%

Section: Geologic Settingmentioning

confidence: 99%

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Fault Slip and Exhumation History of the Willard Thrust Sheet, Sevier Fold‐Thrust Belt, Utah: Relations to Wedge Propagation, Hinterland Uplift, and Foreland Basin Sedimentation

et al. 2019

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“…In the Echo, Utah area, the Hams Fork Conglomerate lies on top of the Echo Canyon Conglomerate and is bound by the Moxa unconformity below and the Laramide unconformity above. The unconformity at the base of the Hams Fork Conglomerate cuts as deep as the Silurian in the fold belt (Coogan & King, 2016). The Hams Fork Conglomerate is composed primarily of a clast‐supported pebble to cobble conglomerate with minor amounts of sandstone (DeCelles & Cavazza, 1999).…”

Section: Geologic Settingmentioning

confidence: 99%

Effects of contemporaneous orogenesis on sedimentation in the Late Cretaceous Western Interior Basin, northern Utah and southwestern Wyoming

et al. 2021

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Three drivers of subsidence are recognized in the Western Interior Basin: Mesozoic–early Cenozoic flexure adjacent to the thin‐skinned, eastward propagating Sevier Orogeny, Late Cretaceous–Eocene flexure associated with thick‐skinned Laramide Uplifts and Late Cretaceous dynamic subsidence. This study combines outcrop lithofacies, palaeocurrent measurements, detrital zircon geochronology, biostratigraphy, stratigraphic correlations and isopach maps of Coniacian–Maastrichtian (89–66 Ma) units to identify these subsidence mechanisms impact on basin geometry and stratigraphic architecture in the northern Utah to southwestern Wyoming segment of the North American Cordillera. Detrital zircon maximum depositional ages and biostratigraphy support that the Maastrichtian Hams Fork Conglomerate was deposited above the Moxa unconformity in the wedgetop and foredeep depozones. The Moxa unconformity underlies the progradational Ericson Formation in the distal foredeep. The Hams Fork, however, is younger than the Ericson Formation, and instead equivalent to upper Almond Formation. Therefore, the hiatus associated with the Moxa unconformity continued for several million years longer in the fold belt and proximal basin than in the distal foredeep, with Ericson Formation‐equivalent strata onlapping the Moxa unconformity towards the west. Regional thickness patterns record and constrain the timing of the transition from Sevier to Laramide‐style tectonic regimes. From 88 to 83 Ma (upper Baxter Formation) a westward‐thickening stratigraphic wedge characterized the foredeep developed by lithospheric flexure by thrust‐belt loading. Nevertheless, the presence of >500 m of subsidence >200 km from the thrust front suggests a long‐wavelength subsidence mechanism consistent with dynamic subsidence. By 83 Ma (Blair Formation) the long‐wavelength depocentre shifted away from the thrust belt, with no evidence of a Sevier foredeep. This depocentre continued migrating eastward during the early‐mid Campanian (ca. 81–77 Ma). The late Campanian–Maastrichtian (ca. 74–66 Ma) is marked by narrow sedimentary wedges adjacent to the Wind River, Granite and Uinta Mountain uplifts and attributed to flexural loading by Laramide deformation.

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Interim geologic map of the Ogden 30' x 60' quadrangle, Box Elder, Cache, Davis, Morgan, Rich, and Summit Counties, Utah, and Uinta County, Wyoming

Cited by 2 publications

References 0 publications

Fault Slip and Exhumation History of the Willard Thrust Sheet, Sevier Fold‐Thrust Belt, Utah: Relations to Wedge Propagation, Hinterland Uplift, and Foreland Basin Sedimentation

Fault Slip and Exhumation History of the Willard Thrust Sheet, Sevier Fold‐Thrust Belt, Utah: Relations to Wedge Propagation, Hinterland Uplift, and Foreland Basin Sedimentation

Effects of contemporaneous orogenesis on sedimentation in the Late Cretaceous Western Interior Basin, northern Utah and southwestern Wyoming

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