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Early Namurian basinal mudstones are the source rocks for these hydrocarbons.
These ores were deposited from basinal brines rich in calcium chloride.
They are the only common macrofossils in the basinal turbidite terrain that underlies the greater part of these regions.
The rocks are a generally regressive sequence from basinal facies to clastic sedimentation.
Irish-style basinal mineralisation - base metals and baryte.
Examples of such basinal environments include backarc, forearc, passive margin, epicontinental, and extensional basins.
The genesis of the basinal lakes, however, S.V. Parnachov admitted so far as ice-dammed one.
Historically this sequence of rocks has been subdivided in different ways with different names in each of the basinal areas in which it is found.
The formation of the foreland basin through rapid subsidence initiated a transgressive sequences that deposited basinal black shales.
Porosities of up to 25% and permeabilities in excess of 200 mD also have been observed in the basinal carbonates of Tønder-2.
Deposition of thick basinal clastic rocks of the Atoka, Strawn, and Canyon Formations occurred at this time.
Soils developed over the lava deposits are mainly lithosols, while regosols are predominant on the Quaternary and pre-Cretaceous basinal deposits.
Within these inland seas, goniatites' greatest abundance and diversity appears to have been achieved in offshore deep ramp and basinal environments rather than in nearshore environments.
By the Middle Ordovician, articulates had diversified to become important components of all marine environments except the deep basin; inarticulates were most important in offshore and basinal settings.
Bengal basin comprises three structural unit: shelf or platform in the west; central hinge or shelf/slope break; and deep basinal part in the east and southeast.
At the base of the Stretton Group the rocks are of basinal oceanic facies and as time goes a coarsening occurs with increased terrigenous input from the continent.
New lead-isotope and rare-earth element (REE) results from the south Pennine area confirm that basinal Viséan-Namurian shales were a major source of the mineralisation.
Lower Palaeozoic formations in Wales and the Lake District consist of early basic to acid volcanics and volcaniclastic sediments with later thick basinal greywacke turbidites.
The Supergroup comprises c.6000m of sedimentary rocks with varying facies from basinal and distal turbiditeto deltaic and fluviatile successions which exhibits a generally regressive sequence.
Turbidite facies are prevalent in the Burway Formation and the deep marine basinal environments continue toward the base of the supergroup within the Stretton Shale Formation.
The potential net pay of the basinal carbonate unit is too thin to be of interest as a reservoir because the total thickness of the unit in Tønder-2 is only 3 m.
Some authors, however, erroneously equate the Plattendolomit with the basinal facies of the Z3 Anhydrite (Richter-Bernburg 1955; Füchtbauer 1972; van Adrichem-Boogaert and Burgers 1983).
Because major clastic wedges and basinal deposits are distributed in a southwestward progression, it is assumed they originated from areas near promontories, areas along the continental margin where deformation is concentrated.
Metallogenesis studies in south Devon have identified the role of basinal brines as mineralising agents, and rubidium/strontium isotope studies have established a Triassic age for the widespread lead-zinc-silver 'crosscourse' mineralisation.
Badham (1981) has suggested that the basinal Lower Silurian shales to the west of the carbonate shelf facies could have formed a suitable depositional environment for mineralisation of the SEDEX style.