Showing papers in "Sedimentary Geology in 1990"

TL;DR: In this paper, the authors identify five types of tufa facies: perched spring line, cascade, fluviatile, paludal, and lacustrine facies.

TL;DR: In this article, the authors show that the macrotidal Severn Estuary has recently reached its maximum capacity, and has for a substantial period been retreating inland by a "rollover" process involving the reworking of long-deposited fine sediments into active environments.

TL;DR: In this paper, the Niagaran (Llandoverian-Ludlovian) is divided into two to five sub-sequences that are marked by sharp, though generally non-erosional basal discontinuities.

TL;DR: In this paper, the mapping of all these reefs serves as an accurate guide to the Upper Tortonian geography of the Granada Basin and provides a detailed analysis of the topology of these reefs.

TL;DR: The earth alternates in a supercycle 400 m.y.d. long from a single continent (Pangea) and ocean (Panthalassa) with an icehouse climate to many continents and oceans with a greenhouse climate.

TL;DR: A 1000 m thick early Mississippian carbonate supersequence, the Carboniferous Limestone of southwest Britain, consists of three third-order depositional sequences as discussed by the authors comprising parasequences in various configurations, and the whole forms a carbonate ramp stack.

TL;DR: In this article, the authors show a hierarchical stacking pattern of transgressive-regressive depositional cycles within the Hanifa Formation and assume that these cycles occur at a basin-wide scale, since they are related to relative changes of sea level.

TL;DR: In this article, four types of terrigenous discharge are classified according to their structural relationships in the Arabo-Persian Gulf, and a major deltaic complex is associated with the Tigris-Euphrates Rivers.

TL;DR: In the Budleigh Salterton Pebble Beds (BSPB) of east Devon as discussed by the authors, three accretionary styles are present in the fluvial conglomerates and pebbly sandstones.

TL;DR: This article showed that microcrystalline carbonate or carbonate mud, traditionally thought to represent ooze deposited in quiet water, commonly forms as an internal precipitate below the sediment-water interface and invalidates classifications that relate the amount of micrite matrix in limestones to the degree of water energy associated with the environment of deposition.

TL;DR: In this article, the formation with interbedded cherts is interpreted as having been deposited during an early stage of magmatic arc activity (around 640-630 Ma ago) in an immature marginal basin.

TL;DR: The Mesozoic Surat Basin is an important hydrocarbon-producing basin in Australia and the principal productive reservoirs there are the quartzose sandstones of Early Jurassic age.

TL;DR: A silt-clayrock sequence in the Francis Creek Shale (Pennsylvanian, Westphalian D) of northeastern Illinois is characterized by the presence of numerous clayrock-paired bands; and cyclic variations in thickness of silt between and within these clayrock pairs as discussed by the authors.

TL;DR: In this paper, 11 successive unconformity bound sequences in the Castlecliff section (Wanganui Basin), each typically composed of a lower, variably conglomeratic, 0.1-2 m thick shell bed and an upper 5-20 m thick barren siltstone, are identified in the stratotype of the local (New Zealand) middle Pleistocene castlecliffian Stage.

TL;DR: In this paper, the authors used the term dolocrete to describe siliciclastic sediments which are partially or completely cemented and/or replaced by terrestrial phreatic dolomite.

TL;DR: The detrital modes of the abyssal plain sediments suggest a recycled orogenic source, probably the Himalayan collision zone as mentioned in this paper, and the facies and longitudinal dispersal pattern suggest deposition in an Oligo-Miocene analogue of the present Indus fan.

TL;DR: The Toarcian transgressive shale sequence shows a progressive change from thick to wavy to fine lamination relating to progressive changes in the sedimentary processes operating in the environment.

TL;DR: In this paper, the temporal and geometric relationships among lithofacies of the Bidahochi Formation illustrate the dynamic interplay between volcanism and sedimentation in an essentially closed sedimentary system.

TL;DR: The late orogenic deposits of the Upper Silurian Holmestrand Formation of the Oslo Region, Norway, comprises sharply alternating ephemeral stream and sandy beach face deposits.

TL;DR: The morphodynamic and morphosedimentary development of drift-aligned and swash-aligned coarse clastic barriers plays an important role in the evolution of paraglacial coasts as discussed by the authors.

TL;DR: In this article, Petrographic, chemical and stable isotope investigations have been made on calcite, dolomite, and Fe-dolomites/ankerite from Permian-Triassic clastic sequences from the Iberian Range (Spain).

TL;DR: In this paper, the authors show that pre-orogenic Cretaceous shelf sandstones at the northern and southern ends of the Sulaiman Range in west-central Pakistan show basically westward dispersal, which is off the craton.

TL;DR: Within the strongly shale dominated sediment fill of the Mid-Proterozoic Belt basin, a large variety of shale types can be distinguished within the Belt basin this paper and they differ in detail and can be related to a variety of depositional processes.

TL;DR: Oligocene sandstones (Frio Formation) of South Texas, deposited by the ancestral Rio Grande, contain a heavy mineral assemblage that is markedly altered even in the shallowest sample examined (approximately 1 km depth) as discussed by the authors.

TL;DR: In this article, a seasonal alternation of aerobic with anaerobic conditions in substrate and bottom water, resulting in one year life-cycles in the benthic environment was investigated.

TL;DR: Sulfur and boron contents were determined for use as paleoenvironmental indicators in 28 samples of coal from the coal-bearing sequence occupying the upper part of the Lower Cretaceous Mannville Group located in the subsurface of southern Alberta, Canada.

TL;DR: The nature, origin and mode of accumulation of fine-grained carbonate sediments have been investigated in the nearly enclosed lagoons of two French Polynesian atolls (Mataiva and Takapoto).

TL;DR: Gordon Group carbonates are a thick (∼ 2 km), stratigraphically continuous Ordovician sequence that ranges in age from the Arenig to the Ashgill and are characterized by high Sr/Na ratios similar to modern aragonitic carbonates.

TL;DR: In the case of the lower Silurian Rastrites Shale from central Sweden, calcite concretions were formed within 1 m depth of the seafloor.