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Showing 1 to 20 of 24 for “"Parasequences"”.
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The Upper Mississippian Bluefield Formation in the Central Appalachian Basin: a Hierarchical Sequence Stratigraphic Record of a Greenhouse to Icehouse Transition
… predominantly of meter-scale, upward-shallowing parasequences, each capped by a flooding surface. These parasequences are stacked into four regionally correlatable depositional sequences. On the basin margin to the southwest and northwest, incised valleys, and fewer meter-scale parasequences …
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High-Resolution Sequence Stratigraphy of Late Mississippian (Chesterian) Mixed Carbonates and Siliciclastics, Illinois Basin
… 4th-order sequences are composed of 5th-order parasequences that can be correlated basin-wide. Parasequences in the basal, dominantly carbonate sequences are composed of patchy ooid grainstone tidal ridge reservoir facies which interfinger with skeletal limestone and are capped by laterally …
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The Sequence Stratigraphic Context of Mixed Basin Margin Evaporites in the Harrisburg Member of the Permian Kaibab Formation, Northern Arizona and Southern Utah
… Harrisburg Member. This study interprets four parasequences making up systems tracts of two depositional sequences. The lower two parasequences are indicative of the highstand systems tract of depositional sequence H1. Facies of the lower parasequences consist of the open-marine wackestone - …
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Thin-bedded Facies Analysis of a Ferron Storm-dominated Delta Front and Prodelta: Cretaceous Ferron Sandstone, Utah
… data were derived from well-exposed outcrops of parasequences 5a, 5b, 6, 11, and 16b, within the Notom deltaic wedge, which represent a spectrum of wave-dominated shorefaces to river-dominated deltas. Parasequences 5a and 5b are comprised of over 60% HCS beds with subordinate amounts of …
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High resolution sedimentologic and stratigraphic investigation of a storm-dominated carbonate ramp, Hoogland Platform (ca. 549 Ma), Nama Group, Namibia
… bed, bedset) or larger scale "entities" (e.g. parasequences, systems tracts, depositional sequences). This damping of topographic elements on the seafloor was found to act at a variety of temporal and spatial scales from the sub-annual and sub-meter laminae and facies scale, through the …
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Sequence Stratigraphy of the Bridal Veil Falls Limestone, Carboniferous, Lower Oquirrh Group, on Cascade Mountain, Utah: A standard Morrowan Cyclostratigraphy for the Oquirrh Basin
… ranging in thickness from 3 to 60 meters, and 62 parasequences. Parasequences are commonly asymmetrical, reflecting rapid flooding followed by protracted shoaling and/or sea level drop. Selected cycles are recognized in the Lake Mountains, Thorpe Hills, and the southern Oquirrh Mountains to the …
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Unresolved Problems Involving the Hydrogeology and Sequence Stratigraphy of the Wasatch Plateau based on Mapping of the Wattis 7.5 Minute Quadrangle, Carbon and Emery Counties, Utah: Insights Gained from a New Geologic Map
… levels. The Star Point Sandstone has three parasequences with a single sequence boundary. The deposits show normal marine conditions containing lower shoreface biota of <em>Skolithos</em> and <em>Ophiomorpha</em> overlain by middle shoreface sedimentary structures. The Star Point Sandstone …
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The Aptian-Albian ironstone of the Rapid Creek formation, Little Fish Creek, NWT: implications for Cretaceous Ocean Anoxic Events and critical mineral deposits
… coarsening-upward cycles are interpreted as parasequences, each recording shallowing through storm wave base. Parasequences are defined by flooding surfaces overlain by laminated, organic-rich mudstone that grades upwards into concretionary, microbial, and hummocky cross-stratified ironstone …
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Transitional Facies and Sequence Stratigraphic Complexity of Shallow-Marine Star Point Formation to Coastal-Plain Blackhawk Formation Along Depositional-Strike, Wasatch Plateau, Utah
… The dip-oriented outcrops show pinch-outs of two parasequences into coastal-plain deposits. This complexity decreases southward, the southern outcrops show a simple transition. At least two sequence boundaries are correlated across the outcrop belt.</p>
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PALAEOECOLOGY, PALAEOENVIRONMENTAL ANALYSIS AND THEIR APPLICATION TO SEQUENCE STRATIGRAPHY: LOWER CRETACEOUS, LUSITANIAN BASIN, PORTUGAL
… (3rd order) and higher resolution sequences and parasequences (4th order). 2nd and 3rd order sequences are correlatable across the southern part of the Lusitanian Basin. They also correlate with previously published sequence chronostratigraphy for the Tethyan realm. The palaeoecological analysis …
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Anatomy of a Carboniferous transgression: upper Tullig Cyclothem, County Clare, Ireland
… and between one and three coarsening-upwards parasequences can be identified at these different locations. The outcrops that are centrally-located in the region (between Diamond Rocks and Carrowmore Point) possess the greatest thicknesses of sands and also up to three parasequences. At these …
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Facies, Sequence Framework, and Evolution of Rudist Buildups, Shu'aiba Formation, Saudi Arabia
… 400 k.y., 4th order sequences and 100 k.y. parasequences driven by long term eccentricity and short term eccentricity respectively, similar to the Pacific guyots of this age. This suggests that early Cretaceous climate may have been cooler and had small ice sheets and was not an ice-free …
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High-resolution sequence stratigraphy and diagenesis of mixed carbonate/siliciclastic successions.
… sequence stratigraphic interpretation of parasequences, systems tracts and sequences. At a parasequence scale, early diagenetic analyses indicate that concretionary growth is controlled by an initial phase of rapid burial, equating to the period of parasequence progradation, followed by a …
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High Resolution Stratigraphy of Ordovician Carbonates, Kentucky: Evidence for a Greenhouse to Glacial Transition
… predominantly subtidal meter-scale cycles (parasequences). Meter-scale subtidal cycles contain facies that suggest they formed under moderate amplitude (20 to 40 m) sea level fluctuations, likely produced by glacio-eustasy. However, peritidal cycles in the HST's indicate they formed under …
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Paleosol evolution in a sequence stratigraphic framework, Cretaceous Ferron Notom Delta, south central Utah, U.S.A.
… fluvial aggradation cycle sets (10Ka) and marine parasequences of the Ferron Notom Delta (10 to 15Ka) may suggest a link between non-marine and marine cyclicity. Fluvial sequences are aggregates of fluvial aggradational cycle sets that are bounded by unconformities or their correlative …
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Facies-driven, seismic inversion-based property modeling, for flow simulation of Delhi Oil Field, Louisiana
… of the seismic dataset. Three transgressive parasequences are identified in the Tuscaloosa interval in the study area. Sediment preservation is partially controlled by inherited physiography, sediment supply, topographic gradient, and faulting. Shoreline parallel marine sandstone bodies are …
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Condensed and Expanded Sections in the Lower Mesaverde Clastic Wedge, Campanian of Wyoming: Evidence for Tectonic Rectification of Sea Level
… unit thickness, the presence of sequences verses parasequences, the presence of sharp-based shorefaces and gutter casts, the inferred paleo-gradient, sequence of stacking patterns, and the presence of incised valleys and unconformities. The evidence shows that the evolution of these members was …
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Sequence Development and Dolomitization of a Late Jurassic Giant Oil Reservoir, Arab-D Reservoir, Hawiyah (GHAWAR) and Harmaliyah Fields, Saudi Arabia
… are strikingly similar in terms of facies, parasequences, and vertical stacking of facies. The direction of the progrodaion is east and northeast and that is supported by northeast thickening of the Arab-D reservoir and by the stromatoporoid and Cladocoropsis facies progrodation. This …
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Sedimentology, facies architecture, and diagenesis of the Middle Three Forks Formation - North Dakota, U.S.A.
… regimes and define up to six coarsening-upward parasequences throughout the study area, generally 1.0-5.5 m in thickness. In contrast, varying amounts of FA3 deposits throughout the succession define five distinct stratigraphic intervals, herein termed Intervals 0-4, which reflect fluctuating …
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Sedimentology, provenance, and salt-sediment interaction in the Ediacaran Pound subgroup, Flinders Ranges, South Australia
… of sands and shales, often in progradational parasequences that become progressively sand-dominated upward. The formation thickens significantly to the north through the preservation of additional sediments that contain abundant fluvial features, suggesting a northern depocentre in the basin. …
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