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Showing 1 to 20 of 99 for “"shallow marine"”.
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Dynamical Sedimentary Models of Shallow Marine Environments
… understanding of sedimentary processes in shallow marine environments. The dynamical sedimentary models in this treatise numerically simulate the sedimentary processes from an event time scale, based on the fundamental physics of sediment dynamics in coastal and shelf depositional …
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Tipping points, regime shifts and species interactions within shallow marine ecosystems
Understanding the response of ecosystems to perturbation is of great importance in a rapidly changing world. Research has shown that in response to pressures such as climate change or over exploitation, entire ecosystems can shift to alternative states, a phenomenon termed regime shifts, and in …
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Late cenozoic shallow marine diamond placers off the northern Sperrgebiet, Namibia
… diamond mining has taken place since 1990 in the shallow marin (<30 m water depth) portions of Mining Licence 45 (Elizabeth Bay) between Halifax Island and Elizabeth Bay along the southwestern coast of Namibia. These operations in the northern part off the coast of the Sperrgebiet have produced …
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The Lower Carboniferous (Chadian-Brigantian) geology of shallow marine carbonate rocks in the central and southeast Irish Midlands and the Wexford Outlier
"This is the first comprehensive study, consisting of integrated petrographical, paleontological and geochemical analyses on the post-Waulsortian strata in the central and southeast Irish Midlands. This study reveals that the style of sedimentation and early diagenesis substantially influenced the …
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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
… architecture right at the transition from marine to non-marine environments is poorly documented. In the Cretaceous outcrops of Utah, Star Point and Blackhawk Formations are well studied. The nature of spatio-temporal transition of these two Formations, in the deposition-strike orientation, …
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Stratal Architecture in a Prograding Shoreface Deposit, Eastern Shore, VA: Relationship to Grain Size, Permeability, and Facies Distribution
… structures in sandy environments, especially shallow marine deposits. Scientists have also realized the need to correlate quantitative permeability to sedimentary structures and scales of stratigraphic organization. The purpose of the study is to investigate the scales of stratigraphic …
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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
… Harrisburg Member above. They were deposited in shallow-marine shelf to restricted coastal settings. Stratigraphically above are the Rock Canyon Conglomerate and the Moenkopi Formation; consisting of the Timpoweap and Lower Red members; which are the only members present in the study area. The …
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A study of epigenetic mineralisation in the Central Zone of the Damara Orogen, Namibia with special reference to gold, tungsten, tin and rare earth elements
… in the SCZ, predominantly continental and shallow marine Damaran metasediments are floored by a 1.7-2.0 Ga granite gneiss basement inlier, that is transected by numerous ENE-trending aurif erous megashears. These structures controlled late Proterozoic mafic dyke emplacement, Damaran rifting …
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Precambrian Basement Influence on the Deposition of the Upper Ordovician Utica Shale Play in East Central Ohio
… Point Pleasant Formation, and Utica shale. The shallow marine fossiliferous limestones of the Trenton and shallow marine shaley limestones of the Lexington are overlain by an interbedded shale and limestone of the Point Pleasant Formation, which grade into the deeper marine interbedded shales …
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The sedimentology and palaeoecology of the Coralline Crag (Pliocene) of Suffolk
The Coralline Crag is a Pliocene, shallow marine, bioclastic sand formation with an outcrop restricted to south-east Suffolk. Four distinct sedimentary facies have been recognised which indicate that the Coralline Crag was deposited during a single marine transgression. The stratigraphically lowest …
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Cretaceous Nerineacean gastropods
… form a distinctive and significant component of shallow marine Mesozoic Tethyan macrofaunas. They occur in shelf sediments deposited in tropical regions during the Jurassic and Cretaceous. The group first appears in the early Jurassic and high diversity levels had developed by late Jurassic and …
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Geology of the Flathead Formation (Middle Cambrian) on the perimeter of the Bighorn Basin, Beartooth Mountains, and Little Belt Mountains in Wyoming and Montana
… sandstone. The formation contains marginal-marine and shallow-marine sediment that was deposited unconformably on Precambrian crystalline and sedimentary rock by an eastward-transgressing sea during middle Cambrian time. </p><p> This field study of the Flathead Formation on the perimeter of …
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Depositional environments and diagenesis, Winnipegosis Formation (Middle Devonian), Williston Basin, North Dakota
… deposition which include deep basin, deep shelf, shallow shelf, reef, lagoon, tidal flat, and evaporite basin. The deposition of the Winnipegosis and Prairie Formations were inter-related and occurred during six episodes. Following a brief hiatus separating the underlying Ashern Formation from the …
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Remote estimation of aquatic sediment density in the presence of scatter.
… estimate the density of the first few meters of shallow marine sediment. Normal incidence reflections from a 16 kHz omnidirectional source are collected using a single hydrophone directly above the source. An empirical relationship is then used to estimate the sediment density from the normal …
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Stratigraphy, sedimentology and resource assessment of the Lower Cretaceous Isachsen Formation: Sverdrup Basin, Ellef Ringnes Island, Nunavut, Arctic Canada
… ripple laminated sandstones and siltstones, marine mudstones and coal deposits that were deposited in meandering, braided stream, coastal plain and shallow marine shelf depositional environments. This study classifies the Isachsen Formation as a mixture of recycled and craton derived …
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Petrophysical facies mapping of the Pennsylvanian Cline Shale, Midland Basin, West Texas.
… for both the distribution of undifferentiated shallow-marine carbonates across the Horseshoe Atoll and borehole washouts. By mapping the petrophysical facies, it was determined that the distribution of the most prospective Organic Rich Shale (ORS) facies, located principally in southwest Howard …
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The lifestyle of Antarcticavis capelambensis through a study of Polar section modulus
<p>When it comes to shallow marine fossil deposits of Late Cretaceous age, the avian fossils present are few and specific. The fragmentary avian fossils that are excavated almost exclusively show a foot-propelled diving lifestyle. Other lifestyles, such as flying, running, soaring, or flapping …
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Sequence stratigraphy and structure of the tertiary limestones in the Gulf of Papua,Papua New Guinea
… across these sequences, namely deep-shelf, shallow-shelf, backreef, reef, shoal, forereef, basin margin and submarine fan facies. Each facies was differentiated according to seismic character and geometry, well core and cuttings descriptions, and its position in the depositional framework of …
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Taphonomy of Sediments: Bioturbation in the Triassic Moenkopi Formation in Southwestern Utah
… ancient river channels, tidal flats, delta and shallow marine environments. Five stratigraphic sections measured in the Virgin Limestone Member provided the basis for this study. Detailed descriptions and quantification of bioturbation were recorded in each of the sections. Similar treatment was …
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