Showing papers in "Sedimentary Geology in 1981"

TL;DR: The Trentishoe Formation (Hangman Sandstone Group, Middle Devonian) of North Devon consists of laterally extensive beds of parallel-laminated, fine-grained red sandstones that build multistorey sand bodies as mentioned in this paper.

TL;DR: The sedimentological details of these beds and fundamental considerations of the mechanics of movement of highly concentrated flows suggests that neither debris-flow nor grain-flow were responsible for the deposition of these conglomerates as discussed by the authors.

TL;DR: A 1600m succession of quartz arenites and associated shaley deposits comprising the Hospital Hill Subgroup at the base of the Witwatersrand Supergroup is considered to have been deposited largely under the influence of tidal processes as discussed by the authors.

TL;DR: In this paper, data from an outcropping laminated interval were collected and analyzed to test the applicability of a theoretical model describing instability of layered systems, and internal characteristics of the stratigraphic interval, and the developmental sequence of convoluted beds, were used to document the developmental history of these structures.

TL;DR: In this article, the Alakir cay Group comprises complexly deformed Mesozoic sedimentary rocks originally deposited along a passive carbonate margin, and the sediments now form a tectonically imbricated stack of thrust sheets (Kumluca Zone) emplaced westwards over a relatively autochthonous carbonate platform (Bey Daglari Zone).

TL;DR: In this article, a succession of shelf and shelf-slope carbonates is developed in southeastern Sicily, and a new formation and four new members are proposed in the upper part of the succession.

TL;DR: The die-back of eel-grass has been found to have played an important role with regard to near-shore sedimentation and coastal changes in the vicinity of Kyholm, Denmark as discussed by the authors.

TL;DR: The Acheloos and small Evinos deltas have been occupied for at least 2300 years and air photographs show three former major distributary channels were occupied by at least 5,000 years.

TL;DR: For example, the authors found that the rate and extent of terrigenous sediment dilution, rather than water temperature, is the primary factor determining whether or not a limestone forms at nearshore or continental shelf depths.

TL;DR: The Ordovician Haouaz Formation in the western-central Gargaf Arch of western Libya provides a well-exposed example of an ancient fan delta system as discussed by the authors, consisting of delta front deposits overlain by subaqueous distributary channels with intervening distributary mouth shoals.

TL;DR: In this paper, four braided stream facies are recognized on the basis of distinct lithologies and assemblages of sedimentary structures, including upward-fining conglomerate to sandstone and mudstone channel fill sequences.

TL;DR: The distribution of sediment types, sedimentary structures, and biota across tidal flats is related ultimately to frequency of inundation and groundwater salinity as discussed by the authors, which is determined by the frequency of salinity and inundation.

TL;DR: In this article, a freeze-sampling technique is described that has proven successful in sampling coarse stream-bed gravels under flowing water and the utility of the technique is demonstrated with examples of grain size characteristics and void ratios of deposits.

TL;DR: The so-called Wealden sediments are no less than 2000 m thick in Santander and north Burgos (northern Spain) as discussed by the authors and the succession rests on an extensive scoured and channeled surface over marine carbonates of Early Callovian age, and ends with the incoming of the Urgonian marine strata and equivalents.

TL;DR: Sedimentological studies of 390 samples from Dwarka, Okha and Bombay beaches indicate that the overall size of the beach sediments varies from very coarse to fine sand as mentioned in this paper.

TL;DR: In this article, a sequence of Quaternary dune limestones and shallow marine calcarenites infill a coastal embayment near Warrnambool in southeastern Australia.

TL;DR: In this article, the Aouinet Ouenine Formation in the southern Ghadames Basin of western Libya provides a well exposed example of a deltaic complex containing both progradational and transgressive facies.

TL;DR: The Cenomanian-Turonian Upper Judea Group of Israel comprises shallow-marine hypersaline dolomites passing laterally into ‘basinal’ limestones and chalks.

TL;DR: In this paper, the ridge and runnel systems are subjected to asymmetric oscillatory and/or unidirectional flow regimes, depending on the stage of development reached by these systems.

TL;DR: In this article, the dominant physical processes which determine sabkha morphology, and the sedimentary response to those processes, can lead to a fundamental understanding of a sabkhha's origin and of how it differs from other sabkhas.

TL;DR: The Eze-Aku Formation (Turonian) as discussed by the authors contains scattered lenses and layers of bioclastic limestone which show three distinct facies: Facies 1, Beds (0.2-1 m thick) of sparite-cemented grainstones grading laterally into cross-bedded medium sandstones, Facies 2, Lenses (1 2 m thick, 0.1 2 km wide) of grainstones and wackestones within fine bioturbated silty sandstones.

TL;DR: In this paper, scanning electron microscopy coupled with petrographic and reservoir characteristic measurements were carried out on 447 core samples from seven different boreholes penetrating concealed unconformities.

TL;DR: In this paper, the Jodhpur Group of Rajasthan, western India, the lowest stratigraphic unit of the Marwar Supergroup (Upper Proterozoic to Lower Cambrian?), consists of unfossiliferous, mainly horizontal bedded sandstones and shales.

TL;DR: In this article, a 7500 km2 seafloor of New Jersey and the Baltimore Canyon Trough was studied in detail using geotechnical and geophysical techniques to identify the sedimentary pattern and bottom processes which have occurred and are active on the continental margin.

TL;DR: The Buntsandstein (Lower Triassic) of the Western Eifel (Germany) is composed of sediments of different origin this paper, which are alluvial-fan, fluviatile, aeolian, lacustrine and deltaic deposits.

TL;DR: Churnet et al. as mentioned in this paper showed that the fine-grained dolostones formed by aggradation of initially very finegrained DAs in presence of fresh water, and that the limestones stabilized and the medium and coarser grained dAs formed in environments of mixed marine and fresh waters.

TL;DR: In this paper, the authors studied the effects of deep burial at depths in excess of 30,000 ft. (9.1 km) on the textural characteristics of carbonate rocks and sandstones.

TL;DR: In this article, the authors used twenty cores from the western Peloponnesus margin and adjacent Matapan Trench to investigate the origin of the sediments and the processes of sedimentation.