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Showing 1 to 20 of 23 for “"Depositional sequences"”.
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Cyclostratigraphy of Late Cambrian cyclic carbonates: An interbasinal field and modelling study, U.S.A.
… subtidal meter-scale cycles and the larger scale depositional sequences on which they are superimposed. Fining-upward peritidal cycles grade seaward into coarsening-upward, shallow to deep subtidal cycles that form a continuum across the carbonate platforms and are genetically linked to one …
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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
… 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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Stratigraphy and Palaeontology of the Late Cretaceous Wapiti Formation, west-central Alberta, Canada
… units and four unconformity-bounded depositional sequences; their study and description have been documented integrating several geological disciplines, including sequence stratigraphic methods, well-log signatures, facies analysis, and fossil associations. On the whole, particular …
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The sequence stratigraphic evolution of the Sturgeon Lake bank, central Alberta, Canada and its regional implications.
… is composed of 12 retrogradationally stacked depositional sequences. Sequences 1 and 2 prograde, and sequences 3-6 backstep. Bank formation and stratal geometries are controlled by eustatic sea level fluctuations in concert with: 1) a northeasterly paleowind direction that induced highly …
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Living in a cornfield: The variation and ecology of Late Prehistoric agriculture in the western Kentucky Confluence Region
… communities. Town sites contain complex and rich depositional sequences surrounding mound and plaza precincts. Archaeological data indicates that occupations were continuous at each site from A.D. 900-1450. Stratigraphic, ceramic, radiocarbon, and archaeobotanical data form the basis for examining …
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High resolution sequence stratigraphy of late Mississippian carbonates in the Appalachian Basin
… interval consists of up to twelve fourth-order depositional sequences (300 to 400 k.y. average duration). The sequences (a few meters to over a hundred meters thick) consist of eolianites, lagoonal carbonate muds, ooid shoals, and skeletal banks, and open marine skeletal wackestone and basinal …
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Sequence Stratigraphy of Middle-Mississippian Carbonates of the Southern Appalachians: Tuscumbia Limestone, Tuscumbia, AL
… which is used as a basis for understanding depositional histories of low-latitude, shallow-water, Mississippian carbonate deposits (Fort Payne Chert and Tuscumbia Limestone) in northwestern Alabama. This in turn, is used to evaluate controls on deposition (e.g., sea level, tectonics, …
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Caracterização das unidades sísmicas, processos sedimentares e idade do cânion Almirante Câmara, bacia de Campos
… in seismic units. The units were correlated with depositional sequences observed by other authors in this basin. Five seismic units separated by unconformities were identified in the continental slope and among these unconformities were the Marco Cinza. The area of the lobe in which the canyon is …
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Controls on deposition, lithologic variability, and reservoir heterogeneity of prolific western interior shelf sandstone reservoirs: Tocito and El Vado sandstones, San Juan Basin, NM
… glauconite rich sandstone with a unique depositional style involving multiple depositional sequences and complex erosional contacts due to focused tidal influence in local paleogeographic lows. The El Vado Sandstone is a low porosity, low permeability regressive-transgressive, storm …
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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
… The Harrisburg Member includes facies and depositional environments ranging from open-marine shallow-subtidal wackestone - packstone, restricted subtidal dolomitic mudstone, dolomitic sandstone, peritidal oolitic grainstone as well as gypsum and red siltstones deposited in a sabkha …
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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
… is subdivided into 21, third and fourth order depositional sequences 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 …
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The sedimentology of coarse grained hyperconcentrated flow deposits within modern and ancient volcaniclastic and alluvial fan sequences
… followed in its wake, exhibited a coarse grained depositional continuum from debris flow to stream flow, including deposits with intermediate sedimentological characteristics termed "hyperconcentrated flow deposits".The systematic and detailed sedimentological analysis of these deposits, combined …
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Seismic sequence stratigraphy of the Lower Congo, Kwanza, and Benguela Basins, offshore Angola, Africa
Sequences are recognized throughout the geologic record. The Angolan margin provides an excellent opportunity to examine the factors that control the deposition and preservation of sediments in sequences, as well as the factors that create the erosion or non-deposition along sequence boundaries. …
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Development of cyclic ramp-to-basin carbonate deposits, lower Mississippian, Wyoming and Montana
… are stacked to form three 3rd to 4th order depositional sequences which are defined by regional transgressive-regressive facies trends. The ramp margin wedge (RMW) developed during long-term sea level fall lowstand conditions and consists of cyclic crinoidal bank and oolitic shoal facies …
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Climatic and tectonic controls on deep water sedimentary cyclicity : evidence from the Miocene to Pleistocene of Cyprus
… reveals that the formation can be divided into depositional sequences,bounded by hard grounds or erosion surfaces, and contains a distinct pattern of marl-chalk couplets. These sequences correlate, within the constraints of biostratigraphy to European and New Jersey Margin sequence …
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Palynology of the Hagel lignite bed and associated strata, Sentinel Butte Formation (Paleocene), in central North Dakota
… to the forest-swamp environment. The local depositional basin was broad, laterally continuous, and possessed little relief. Relatively minor changes in water level may be responsible for laterally continuous alternating clastic-to-coal depositional sequences found in the study area.</p>
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High resolution sedimentologic and stratigraphic investigation of a storm-dominated carbonate ramp, Hoogland Platform (ca. 549 Ma), Nama Group, Namibia
… 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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Integrated approach to solving reservoir problems and evaluations using Sequence Stratigraphy, Geological Structures and Diagenesis in Orange Basin, South Africa"
… The wireline logs of the 10wells were broken to depositional sequences and systems tracts: lowstand, transgressive and highstand systems tracts. The seismic section was analysed for depositional sequences, systems tracts and structures. Growth faults that are listric and normal were found …
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Insights Into the Stratigraphic Evolution of the Early Pennsylvanian Pocahontas Basin, Virginia
… onset of the Alleghanian Orogeny. The tropical depositional landscape produced stacked deposits of braided-fluvial channels, broad alluvial plains, tidally-influenced estuaries and small deltas. Trends in facies associations allowed development of a high-resolution sequence stratigraphic …
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Estratigrafia de sequências do intervalo aptiano ao albiano na Bacia do Araripe, NE do Brasil
… associated in order to characterize different depositional systems, that integrate from the continental environment (fluvial system and lacustre), paralic system (delta system and lagunar) to the marine environment (shelfenvironment). The first one, the fluvial system was divided into two …
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