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Showing 1 to 20 of 51 for “"Lower Cretaceous."”.
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Carbonate rock-water diagenesis lower cretaceous, Stuart City Trend, South Texas
The Stuart City Trend in south Texas is a Lower Cretaceous shelf-edge buildup of bioclastic and reefal carbonates. This carbonate system is currently buried to depths of between 3,300 and 5,000 meters. Combined with the equivalent updip shallow water, shelf carbonates of the Edwards and Glen Rose …
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The lower cretaceous flora of the gates formation from western Canada
The Lower Cretaceous Gates Formation (late Early Albian) of western Canada is a sequence of paralic coal-bearing strata composed of siltstone, sandstone and coal. Macrofossil plants are abundant in the Gates Formation; most fossils are impressions; others include casts and molds of tree trunks. No …
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PETROGRAPHIC AND STRATIGRAPHIC ANALYSIS ALONG THE LOWER CRETACEOUS STRATA, IN KIMBLE COUNTY TEXAS
… couplets that were deposited during the Middle Cretaceous in the south Llano Uplift region. The upper Trinity Group was deposited on a southward dipping platform in the Kimble County area. Stratigraphic units of the upper Trinity Group are the Hensel Formation, determined to be supratidal …
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PALAEOECOLOGY, PALAEOENVIRONMENTAL ANALYSIS AND THEIR APPLICATION TO SEQUENCE STRATIGRAPHY: LOWER CRETACEOUS, LUSITANIAN BASIN, PORTUGAL
… models. A palaeoecological study of three Lower Cretaceous successions (at Ericeira, Cascais, Cabo Espichel) from the southern part of the Lusitanian Basin, Portugal, provides a basis for this study. This palaeoecological analysis allowed the construction of a detailed picture of the …
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Palaeontology and biostratigraphy of the Lower Cretaceous Qihulin Formation in eastern Heilongjiang, northeastern China
… ten genera and 16 species, including common Lower Cretaceous species such as Ammodiscus rotalarius Loeblich & Tappan, 1949, Cribrostomoides? nonioninoides (Reuss, 1836), Haplophragmoides concavus (Chapman, 1892), Trochommina depressa Lozo, 1944. The radiolarians comprise ten genera and 17 …
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Regional stratigraphy of the Newcastle Formation (Lower Cretaceous) in eastern Montana and western North Dakota
<p> The Newcastle Formation (Lower Cretaceous) consists of sandstone with interbedded shale, siltstone, and mudstone facies. This work shows that the regional stratigraphy of the unit is detailed enough for the interpretation of its depositional history and environments in eastern Montana. This …
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Depositional Architecture of Confined Meander Belt Deposits, Lower Cretaceous Grand Rapids Formation, east-central Alberta
The Cretaceous Grand Rapids Formation in east-central Alberta is comprised ofprograding deltaic to marginal marine deposits incised by fluvial to marine-influenced fluvial bodies at several stratigraphic levels. Facies mapping and a high-resolution allostratigraphic framework are used to map the 3D …
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Reservoir characterization and prediction of the Lower Cretaceous Glauconite Member at Jenner-Suffield Field, Alberta, Canada.
… of southern Alberta, Canada, occur within the Lower Cretaceous Glauconitic Member of the Upper Mannville Formation. The Glauconitic Member accumulated within fluvial-estuarine environments during transgressive sea level rise following an episode of lowstand paleovalley incisement. Borehole data …
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FACIES AND DIAGENESIS ANALYSES OF THE FORT TERRETT FORMATION OF THE LOWER CRETACEOUS EDWARDS GROUP, NEAR JUNCTION, TEXAS
… occurred within shallow, quiet waters during the Lower Cretaceous. Rose (1974) developed a general stratigraphic correlation and lithostratigraphic framework for the Cretaceous Shelf and established a regional correlation. Four stratigraphic divisions have been recognized in the Fort Terrett …
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Stratigraphy of the Inyan Kara Formation (Lower Cretaceous) in the vicinity of the Nesson Anticline, northwestern North Dakota
<p>The Lower Cretaceous Inyan Kara Formation, at the base of the Dakota Group, consists of sandstone, siltstone, shale, and coal. The stratigraphy of the Inyan Kara and facies relationships within the formation and with the underlying Swift and overlying Skull Creek Formations in the vicinity of …
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Depositional history, environments of deposition, and hydrocarbon potential of the Newcastle Formation (Lower Cretaceous) of eastern North Dakota
… regression and subsequent transgression of the Cretaceous Interior Seaway during the mid to late Albian. The regression of the Skull Creek Seaway exposed the underlying shales to erosion, thereby allowing incision of at least one major drainage system, and possibly several smaller tributary …
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Stratigraphy and channel discrimination of the J sandstone, Lower Cretaceous Dakota group, south and west of Denver, Colorado
Includes bibliographical references (pages 165-172).
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Stratigraphy, sedimentology and resource assessment of the Lower Cretaceous Isachsen Formation: Sverdrup Basin, Ellef Ringnes Island, Nunavut, Arctic Canada
The Isachsen Formation is a Barremian to Aptian-aged fluvio-deltaic succession ranging in thickness from tens of meters to over 1400 m within the Sverdrup Basin of the Canadian Arctic Archipelago. The formation exhibits a variety of lithologies including coarse-grained quartz-arenite sandstones, …
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DEPOSITIONAL ENVIRONMENT AND FACIES ANALYSES OF THE OWL MOUNTAIN PROVINCE, FORT HOOD MILITARY INSTALLATION, BELL AND CORYELL COUNTIES, TEXAS
… Military Installation and is characterized by Lower Cretaceous Fredericksburg Group carbonates. The topography is capped by thick sequences of the Edwards limestone; steep scarps and incised valleys along the edges of the plateaus host inter-fingering outcrops of the Edwards and Comanche Peak …
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HlGH RESOLUTION PALAEOMAGNETIC ANALYSES OF CRETACEOUS SHALLOW WATER CARBONATES
… sequence of 88 m of continuous borehole cores of Lower Cretaceous shallow water carbonates from Southern Italy was obtained and studied lithologically and palaeomagnetically. It was found that the rocks are organized in cyclic lithofacies representing depositional environments from subtidal to …
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Mesozoic geology of the Agulhas Bank, South Africa
… and unconformable horizon (horizon C) within the Lower Cretaceous. An additional two horizons were mapped over part of the Agulhas Bank; they are horizons A (base of the Uppper Cretaceous) and 11 (within the Lower Cretaceous). These reflector horizons were tied to stratigraphic control points in …
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The Post Triassic uplift and erosion history of the Southwestern UK
… episodes beginning during the Upper Triassic-Lower Jurassic (215-195Ma), Lower Cretaceous (140-120Ma), early Paleogene (75-55Ma), Eocene-Oligocene (35-20Ma) and Neogene (20-10Ma). Upper Triassic-Lower Jurassic exhumation appears confined to the footwalls of major basin bounding faults, …
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