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carbon
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Upper Cambrian
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Mount Simon Sandstone (1)
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Pilgrim Formation (1)
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Potsdam Sandstone (1)
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Steptoean (2)
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Wonewoc Formation (1)
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Carboniferous
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Lodgepole Formation (1)
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Deadwood Formation (1)
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Devonian
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Exshaw Formation (1)
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lower Paleozoic
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Rose Run Sandstone (1)
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GeoRef Categories
Era and Period
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Sauk Sequence
Middle Neoproterozoic–Early Ordovician: foreland basins, climatic extremes and rift-to-drift margins
Geology of Frenchman Mountain and Rainbow Gardens, southern Nevada, USA
ABSTRACT This field guide synthesizes more than a half century of research by many geologists and paleontologists on Frenchman Mountain and Rainbow Gardens, southern Nevada, USA. The field-trip consists of seven stops to be visited in one day. The guide was written not only for field-trip participants on the occasion of the 2022 Cordilleran/Rocky Mountain Geological Society of America Joint Section Meeting in Las Vegas, but also with future users in mind. The Frenchman Mountain/Rainbow Gardens block of crust exposes an extraordinary sample of Earth history. The geologic features include (1) Proterozoic crystalline rocks, (2) the Great Unconformity, (2) a Paleozoic interval that is essentially a tilted section of the western Grand Canyon, (3) a Mesozoic interval that preserves strata that were eroded off the southern Colorado Plateau during the Miocene “Great Denudation” episode, and (4) a Cenozoic section that records a wealth of paleoclimatic, paleontological, and tectonic data. Among the many stories that are recorded in the rocks of the Frenchman Mountain/Rainbow Gardens block, I have chosen three to emphasize in this field guide: (1) the history recorded in the Proterozoic Vishnu Basement Complex and the Great Unconformity; (2) the stratigraphy, sedimentology, paleontology, and geochronology of the Cambrian Tonto Group [with a focus on (a) trilobite biostratigraphy in the Bright Angel Formation, (b) the significance of the abundance of glauconite in the Tonto Group, and (c) the Frenchman Mountain Dolostone]; and (3) the tectonic story recorded in the Thumb Member of the Horse Spring Formation. The basement rocks record events and processes associated with the assembly of supercontinents Nuna and Rodinia. The Great Unconformity records the breakup of Rodinia and the associated denudation interval that played a role in triggering the Cambrian explosion. The Tonto Group, which was recently expanded to include the Frenchman Mountain Dolostone, records the Sauk Transgression. And the Thumb Member of the Horse Spring Formation contains rock avalanche deposits that have played a key role in sorting out the tectonic history of the southern Nevada region and the translational history of the Frenchman Mountain/Rainbow Gardens block.
U-Pb detrital zircon ages of Cambrian–Ordovician sandstones from the Taebaeksan Basin, Korea: Provenance variability in platform shelf sequences and paleogeographic implications
Western Canada Sedimentary Basin petroleum systems: A working and evolving paradigm
Latest Neoproterozoic to Cambrian detrital zircon facies of western Laurentia
Sabkha Facies and the Preservation of A Falling-Stage Systems Tract At the Sauk II–III Supersequence Boundary In the Late Cambrian Eilean Dubh Formation, NW Scotland
Detrital zircon geochronology of the Grenville/Llano foreland and basal Sauk Sequence in west Texas, USA
Overview of Lower Cambrian Mixed Carbonate-siliciclastic Deposition along the Western Laurentian Passive Margin
Abstract The Lower Cambrian (Waucoban Series; Fallotaspis–Olenellus Biozone) carbonate-siliciclastic units of western Laurentia outcrop from Sonora, Mexico, to western Nevada, and from northeastern Washington to east-central Alaska. The allochthonous Cassiar terrane in northwestern British Columbia was originally deposited between these two segments, forming a widespread large carbonate platform along this margin during the initial Paleozoic flooding (basal Sauk megasequence) of North America. The Lower Cambrian carbonate-siliciclastic units of western Laurentia commonly are subdivided into two second-order or composite third-order depositional sequences. The lowstand systems tracts to these sequences commonly are marine siliciclastics that grade upward into transgressive systems tracts composed of interbedded shaly carbonates or carbonate-rich shales that grade upward into carbonate-dominated highstand systems tracts. The carbonates commonly record deposition on a gently sloping ramp; however, areas of localized syndepositional extensional faulting created locally faulted carbonate margins. Large allochthonous blocks of shallow-water carbonates and siliciclastics were deposited basinward of these active fault zones. The facies of the western Laurentian Lower Cambrian carbonate ramps, arranged from land toward the basin, are fluvial nearshore siliciclastics, carbonate tidal flats, mixed carbonate-siliciclastic lagoons, high-energy ooid grainstone shoals containing or surrounded by algal-archaeocyathan mounds, downslope nodular facies, and interbedded calcisiltite and shale deposited below a fair-weather wave base. The algal-archaeocyathan mounds constructed small isolated biostromes (<90 m [<295 ft] thick), not large continuous reefs. The continuity of the ooid grainstone shoals along the western Laurentian margin indicates that they formed a barrier separating restricted facies to the east from open-marine facies to the west that stretched from present-day east-central Alaska to northwestern Mexico.
Abstract The Great American Carbonate Bank (GACB) comprises the carbonates (and related siliciclastics) of the Sauk megasequence, which were deposited on and around the Laurentian continent during Cambrian through earliest Middle Ordovician, forming one of the largest carbonate-dominated platforms of the Phanerozoic. The Sauk megasequence, which ranges upwards of several thousand meters thick along the Bank's margin, consists of distinctive Lithofacies and fauna that are widely recognized throughout Laurentia. A refined biostratigraphic zonation forms the chronostratigraphic framework for correlating disparate outcrops and subsurface data, providing the basis for interpreting depositional patterns and the evolution of the Bank. GACB hydrocarbon fields have produced 4 BBO and 21 TCFG, mostly from reservoirs near the Sauk-Tippecanoe unconformity. The GACB is also a source of economic minerals and construction material and, locally, serves as either an aquifer or repository for injection of waste material. This Memoir comprises works on biostratigraphy, ichnology, stratigraphy, depositional facies, diagenesis, and petroleum and mineral resources of the GACB. It is dedicated to James Lee Wilson who first conceived of this publication and who worked on many aspects of the GACB during his long and illustrious career.