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Showing 1 to 20 of 26 for “"Middle Jurassic"”.
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Sedimentology, Stratigraphy and Reservoir Characterization of the Middle Jurassic Upper Shaunavon Member in Southwestern Saskatchewan
The Upper Shaunavon Member in southwestern Saskatchewan has once again become an area of a new interest with advances in drilling and completion techniques. The member has been a medium oil producer since the 1950’s and has some of the most prolific oil production within the province. In …
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The palaeoenvironments and stratigraphy of the Lincolnshire Limestone Formation (Middle Jurassic: Bajocian) of Northamptonshire and southern Lincolnshire
The Lincolnshire Limestone Formation, which crops out in eastern England from the Humber south for over 100 kilometres, is well exposed in the study area in the quarries of Cowthick, Clipsham, Copper Hill and Brauncewell. Nine members recognised by previous authors in this formation can be …
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Diagnetic modelling in Middle Jurassic clastic sediments from the Ravenscar group, Yorkshire, and the Brent group, northern North Sea
… is illustrated here by reference to the Middle Jurassic Dogger Formation and Ravenscar Group which outcrop on the North Yorkshire Moors and the Brent Group from Wells 3/3-1, -2, and -3 in the Ninian Field, and 210/15-2, also in the Northern North Sea.The Ravenscar Group is interpreted as …
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AN APPLICATION OF FLUID MOBILITY ATTRIBUTE FOR PERMEABILITY PROGNOSIS WITHIN THE MIDDLE JURASSIC SEDIMENTS IN THE SOUTHERN PART OF WESTERN SIBERIA
… productivity in this area is related to the middle Jurassic Ju3-4 formation. The target interval is laterally changeable and characterized by weakly anisotropic sandstones with interbedded coal and shale. As a result, there are difficulties in predicting the lateral variations of the …
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The middle Jurassic of New Zealand : a study of the lithostratigraphy and biostratigraphy of the Ururoan, Temaikan and Lower Heterian Stages (?Pliensbachian to ?Kimmeridgian)
… successions of Ururoan, Temaikan and Lower - Middle Heterian (?Sinemurian, Pliensbachian - ?Kimmeridgian) strata from southwest Auckland, south Otago and Southland, New Zealand, are described and discussed. A more logical correlation of the lithologic sequence at Port Waikato with that at Te …
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Facies analysis of three members of the Scarborough Formation (Middle Jurassic : Lower Bajocian) in the Cleveland Basin, northeast England : Blea Wyke, Byland Limestone and Crinoid grit members
… complex, storm-dominated inner shelf and sandy middle shelf. The presence of a tidal sandwave complex is particularly interesting; it indicates that the forging of a marine connection to the west of the Cleveland Basin was necessary before tidal cyclicity could become prominent within the basin.
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Geology of the central Moresby Island region, Queen Charlotte Islands, (Haida Gwaii) British Columbia
… Triassic Karmutsen Formation and Kunga Group, Middle Jurassic arc volcanic rocks of the Yakoun Group, marine sedimentary rocks of the Longarm Formation and Queen Charlotte Group, and Tertiary volcanic rocks. The Karmutsen Formation and Kunga Group rocks exposed in central Moresby Island formed …
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DEVELOPMENT OF THE ROCKY MOUNTAIN FORELAND BASIN: COMBINED STRUCTURAL, MINERALOGICAL, AND GEOCHEMICAL ANALYSIS OF BASIN EVOLUTION, ROCKY MOUNTAIN THRUST FRONT, NORTHWEST MONTANA
The sub-Middle Jurassic unconformity exhumed at Swift Reservoir, in the Rocky Mountain thrust belt of Montana, exposes structures that call for a re-evaluation of the deformation history at this locale. The unconformity separates Late Mississippian Madison Group carbonate (~340 Ma) from the …
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DEVELOPMENT OF THE ROCKY MOUNTAIN FORELAND BASIN: COMBINED STRUCTURAL, MINERALOGICAL, AND GEOCHEMICAL ANALYSIS OF BASIN EVOLUTION, ROCKY MOUNTAIN THRUST FRONT, NORTHWEST MONTANA
The sub-Middle Jurassic unconformity exhumed at Swift Reservoir, in the Rocky Mountain thrust belt of Montana, exposes structures that call for a re-evaluation of the deformation history at this locale. The unconformity separates Late Mississippian Madison Group carbonate (~340 Ma) from the …
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A PALAEOMAGNETIC STUDY OF CRUSTAL ROTATIONS AND THEIR RELATIONSHIP TO THE TECTONICS OF THE ATACAMA AND DOMEYKO FAULT SYSTEMS, NORTHERN CHILE
… In the Coastal Cordillera, analysis of Middle Jurassic lavas (La Negra Formation) and Middle Jurassic to Early Cretaceous dyke swarms reveal a consistent clockwise rotation of approximately 42°. The remanence from the La Negra Formation passes both fold and reversal tests and is …
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Paleomagnetic and mineral magnetic studies of zinc-lead ore deposits in the Metaline (Washington state, USA) and Midlands (Ireland) ore fields
… postfolding magnetizations acquired during the Middle Jurassic (166+-6 Ma), in the waning stages of the Nevadan Orogeny. The thermal (Th) and alternating field (AF) step demagnetization, saturation isothermal anaylses (SIRM), and artificial specimens' tests show that the characteristic remanent …
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No Triassic structural control of the development of the Middle Ground Arch, Eastern Gulf of Mexico
… Mexico before and during deposition of the Upper Jurassic Norphlet, Smackover, and Haynesville Formations is important because these formations have hydrocarbon potential and determining the distribution may help us predict the location of these hydrocarbons. Strictly regulated lease sales and …
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The evolution and palaeobiogeography of mesozoic planktonic foraminifera
… in the subsequent forty years our knowledge of Jurassic planktonic foraminifera has expanded considerably. A thorough re-evaluation of the Oberhauser and Fuchs collections in Vienna has shown that these species are probably not planktonic and that the first planktonic taxa appeared in the …
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A multidisciplinary approach to reservoir characterization of the coastal Entrada erg-margin gas play, Utah
… outermost erg-margin can be observed within the Middle Jurassic Entrada Sandstone near Capitol Reef National Park, Utah. These erg-margin deposits contain isolated reservoir quality sandstone bodies that transition into a muddy tidal flat facies. These high quality reservoirs are dominated by …
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The Marcona - Mina Justa District, South-Central Perú: Implications for the Genesis and Definition of the Iron Oxide-Copper (-Gold) Ore Deposit Clan
… Ma episode of eruption of andesitic magma in the Jurassic arc, but mineralization is hosted largely by underlying, Lower Paleozoic metaclastic rocks. The magnetite orebodies exhibit smoothly curving, abrupt contacts, dike-like to tubular apophyses and intricate, amoeboid interfingering with dacite …
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Three-dimensional eolian bounding surface architecture of the Entrada sandstone, Utah: expanding our understanding of reservoir heterogeneity in wet eolian systems
… stratigraphic architecture of wet eolian Middle Jurassic Entrada Sandstone outcrops located ~60 km south of Moab, Utah at Rone Bailey Mesa (RBM). Six facies are identified, primarily based on sedimentary fabrics, and grouped into four facies associations named dune, sabkha, sand sheet, and …
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Three-dimensional eolian bounding surface architecture of the Entrada sandstone, Utah: expanding our understanding of reservoir heterogeneity in wet eolian systems
… stratigraphic architecture of wet eolian Middle Jurassic Entrada Sandstone outcrops located ~60 km south of Moab, Utah at Rone Bailey Mesa (RBM). Six facies are identified, primarily based on sedimentary fabrics, and grouped into four facies associations named dune, sabkha, sand sheet, and …
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Environmental controls on the skeletal mineralogy of marine calcifiers
… intensity” (ASI, Chapter 4). In the Ordovician – Middle Jurassic, ASI was correlated with the relative success of aragonitic calcifiers from the Paleobiology Database (PBDB), as well as with the relative production of aragonite in reefs from the Paleoreefs Database (PARED). From the Late Jurassic …
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The Multituberculates as Living Animals: New Insights into the Ecomorphology, Behavior, and Life History of One of the Most Successful Mammalian Lineages
… and omnivores whose fossil record spans the Middle Jurassic (ca. 170 Ma) through the end of the Eocene (ca. 35 Ma). Despite their predominance in early mammalian fossil assemblages, the paleobiology of multituberculates remains relatively obscure, due in part to their lack of modern …
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Molecular evolution of beta (â) keratins in three bird species and divergence time estimates for the avian â-keratin subfamilies
… on all four limbs and is dated to the early Middle Jurassic (~155 Ma). One way researchers may study the evolution of feathers is through the use of genetic information, such as whole genomes, to understand the molecular evolution of proteins involved in the formation of these novel …
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