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Showing 1 to 20 of 22 for “"Sequence boundary"”.
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Valley Widening and the Composite Nature of Valley Margin Sequence Boundaries: Evidence from the Neilson Wash Compound Valley Fill, Cretaceous Ferron Sandstone, Utah
… are at the center of a debate about whether sequence boundaries are chronostratigraphically significant. Current research has suggested that the sequence boundary that makes up the floor and walls of an incised valley is constantly being modified throughout the entire relative sea-level …
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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
… Arizona and southern Utah to analyze the sequence stratigraphic context of the 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 …
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Stratigraphy, Petrology, Diagenesis, Paleontology, and Depositional Environments of the Harrisburg Member of the Kaibab Formation in Northern Arizona and Southern Utah
… silica or dolomudstone.</p> <p>Fourth order sequences are present. Sequence one consists of the Fossil Mountain Member; units one, two, and three representing a highstand to falling stage systems tract. The top of unit three was subaerially exposed during a lowstand systems tract creating …
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Sequence Stratigraphy of Campanian-Maastrichtian Strata in Eastern Alabama
… oil rich areas down dip in the Gulf of Mexico. A sequence stratigraphic framework using the T-R cycle methodology of Embry (2002) has been established by integrating surface and subsurface lithologic data with biostratigraphic zonations into Petra ®. High sedimentation from the ancestral …
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Fluvial influence on high-frequency sedimentary cycle geometry: The transition from strandplain to deltaic deposition in the Cretaceous Point Lookout Sandstone, San Juan Basin, Colorado
… by a base level fall and development of a Type 2 sequence boundary as evidenced by a basinward shift in shoreline facies expressed as distributary channel sandstones overlying shoreface deposits. Deposition in the study area, therefore, represents late highstand systems tract progradation and …
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Sequence Stratigraphy of Middle-Mississippian Carbonates of the Southern Appalachians: Tuscumbia Limestone, Tuscumbia, AL
<p>This field-based research develops a sequence stratigraphic framework and detailed facies analysis 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 …
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Cretaceous and Paelogene Stratigraphy of Forrest County, Mississippi
… continuous deposition across the Mid-Cretaceous Sequence Boundary is supported by well log data from eastern Forrest and western Perry Counties. The Jackson and Vicksburg Group carbonate sediments undergo a facies change along a north-south trend within the study area.</p>
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Analysis of the Upper Cotton Valley Group in the Northeastern Mississippi Interior Salt Basin
… Member, and a lower Shongaloo Member. The boundary between these units correspond to a transgressive-regressive sequence boundary, which marks the beginning of a rise in sea level during the Tithonian. By identifying significant electric-log signatures within the Upper Cotton Valley, these …
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High-resolution sequence stratigraphy and diagenesis of mixed carbonate/siliciclastic successions.
… nearshore successions can be explained within a sequence stratigraphic concept; to assess whether the identification and analysis of these features can be used to aid in making sequence stratigraphic interpretations; and to evaluate whether sequence stratigraphy can be used to predict the …
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Evolution and Architecture of an Incised Valley in the Upper Cretaceous Eagle Formation in South-Central Montana
… the regressive surface of marine erosion (RSE), sequence boundary (SB), and transgressive surface of tidal-fluvial erosion (TSE). Within this sequence stratigraphic framework, 4 facies association, internal lower-order architectures (i.e. channel forms, lateral accretion sets, crevasse splays) …
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Evolution and Architecture of an Incised Valley in the Upper Cretaceous Eagle Formation in South-Central Montana
… the regressive surface of marine erosion (RSE), sequence boundary (SB), and transgressive surface of tidal-fluvial erosion (TSE). Within this sequence stratigraphic framework, 4 facies association, internal lower-order architectures (i.e. channel forms, lateral accretion sets, crevasse splays) …
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Sequence Stratigraphy, Depositional Environments, and Regional Mapping of the Late Devonian Interval, Upper Three Forks Formation, Sanish Member, and Lower Bakken Shale, U.S. Portion of the Williston Basin
… on the identification of several significant sequence stratigraphic surfaces.;The four facies identified in the Sanish include: Facies A, a dolomitic and Skolithos burrowed sandstone with a hard-ground at the base as originally defined in the Antelope Field; the widely distributed Facies B, a …
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Sequence stratigraphy and the development of a clinoformal carbonate ramp on an abandoned delta system: Mississippian Fort Payne--Salem Interval, Kentucky
… interval) form a large scale depositional supersequence (0 to 500 feet thick, approximately 8 m. y. duration). It formed on and in front of the abandoned Early Mississippian Borden deltaic marine paleoshelf, which had up to 100 m of relief above the adjacent starved basin. Major facies consist …
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Sedimentology of Kingston Peak Formation KP1 Beds in Beck Canyon Region, Kingston Range, California
… analyze the sedimentary structures, textures and sequences. We have found only three sites in the northern Kingston Peak Range where the contact can be observed. At each site we measured sections about 4 meters long across the contact. The top of the BSD in all locations contains microbial …
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A Stratigraphic and Geochronologic Analysis of the Morrison Formation/Cedar Mountain Formation Boundary, Utah
… characters across the previously enigmatic boundary. The uppermost Morrison Formation is characterized by redoximorphic paleosol features, including iron concentrations, manganese-coated grains, and intense red-purple-green mottling. Upsection increases in chert-pebble lags and channelized …
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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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Thermal and Mechanical Response of Curved Composite Panels
… Panels with three different lamination sequences are considered, including a quasi-isotropic laminate, an axially soft laminate, and an axially stiff laminate. These panels were chosen because they exhibit a range of stiffnesses and a wide variation in laminate coefficients of thermal …
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Siesmic Stratigraphy of Upper Pleistocene gravel and holocene mudbelt deposits between wreck point and the kamma river on the western shelf of South Africa
… the north and south of the central Holgat River sequence with the identified Type 1 Sequence divided into systems tracts. The Type 1 Sequence Boundary represents a major erosional unconformity formed as a result of tectonic uplift and a relative drop in sea level. A wave-cut knick point provides …
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Numerical simulation of damage and progressive failures in composite laminates using the layerwise plate theory
… such as out-of-plane material properties, boundary conditions, and stiffness reduction methods on the failure stresses and strains of a quasi-isotropic composite laminate with free edges subjected to tensile loading is studied. The ultimate stresses and strains predicted by the Generalized …
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Geo- and biodynamic evolution at the northern margin of Gondwana during Late Silurian to Early Devonian time (Hazro Area, SE Turkey)
… of 24 worldwide occurring Silurian/Devonian boundary sites and a subsequent organic geochemical evaluation of eight of these locations from Turkey, Morocco, Ukraine, Poland as well as from the stratotype section in the Czech Republic revealed that the organic matter of sediments from the …
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