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Topic: Visean


  
  Variscan diastrophic sediments
The ages of the folded and detached segments (formations) diminish towards the E. The Middle to late Visean basin fills were sedimented in a setting of maturing CIA with scarcely preserved features of OIA.
The youngest siliciclastics of the latest Visean to early Namurian(?) age were deposited in a CIA to ACM setting, and were provided by a homogeneous acidic arc source.
The main DS volumes were deposited during the Visean to Visean/Namurian-A, but the oldest DS formation on the Northwest is in close contact with the Givetian trilobite shale and can be also Devonian(?).
www.gli.cas.cz /Departments/paleomagnet/variscan_diastrophic_sediments.htm   (779 words)

  
 PUBLISHED PAPERS
It is possible, that late Visean siltstone and conglomerate formations continued this stack of sequences in a sense of sedimentary, not tectonic continuation.
Block D (on the northeast of the quarries) is fairly similar, with an exception for direct cover of the Vilemovice (Mokra) limestone.
This cover consists of dark gray detritic banks, in contrast with lenticular limestones of the blocks C and E. Block E corresponds to well-known sequences of the Western Quarry of Mokra.
www.gli.cas.cz /myweb/home/hladil/REF-Y/R-036.html   (680 words)

  
 waulsort
As Tournasian-early Visean carbonate deposition was widespread in the range of 30 degrees north to 10 degrees south, the very restricted paleogeographic distribution of Waulsortian and Waulsortian-like mound locations suggests a mechanism or set of conditions which effectively limited the distribution of mud mounds.
Use of the Visean global reconstruction is appropriate because the relative positions of Laurussia and Gondwana changed only slightly over the Tournaisian-Visean interval, and the relatively slow rate of Laurussian drift only moved that paleocontinent approximately 1 degree south during the Tournaisian-early Visean (drift rate from Ross and Ross, 1985).
The probable tracks of some Tournaisian-early Visean hurricanes and tropical storms nucleating in the eastern Panthalassa ocean would have lead ultimately onto the continental shelves of North China-Tsaidam, Tarim, and Kazakhstania and the northern shelf system of Gondwana, including the South China platform, the Shan Thai-Malaysia block, and the northern basins of Australia (Fig.
www.auburn.edu /~kingdat/waulsortian/waulsort.html   (5137 words)

  
 Lower Carboniferous, Dnieper-Donets Depression   (Site not responding. Last check: 2007-10-14)
The Tournaisian is highly favorable for new discovery in all the middle part of the Dnieper-Donets graben as well as the eastern half of the south border zone, where several fields have already been discovered.
Favorability of the lower Visean is similar to that of the Tournaisian.
Areas highly favorable for the upper Visean include a large part of the depression as well as an area outside the depression on the north.
geocities.com /internetgeology/L52a.html   (540 words)

  
 [No title]   (Site not responding. Last check: 2007-10-14)
The Visean (Tula) is predominantly fine-grained slope packstones.
Logs - The Visean (Oksky) slope deposits appear on an FMI log as irregular layers that are rarely continuous across the image.
Distal slope deposits of the Visean (Tula) are characterized by thin layers that are continuous across the image.
aapg.confex.com /aapg/no2000/techprogram/paper_1587.htm   (348 words)

  
 Extended Abstract SPP '98
The history of the Variscan Rhenohercynian foreland-basin from Visean to Stephanian was subject of several studies by the authors in the last years.
Starting in the Upper Visean, more than 2000 m of a turbiditic succession was deposited in the asymmetric Rhenohercynian flysch-basin.
In the Lower Carboniferous, a general thinning of the successions of the foreland in the NW is observed.
www.geo.uni-jena.de /geophysik/variscium/abstracts/spp98.html   (1063 words)

  
 Alexander's Gas & Oil Connections - Bitech announces successful results from oil zone in Lekker field   (Site not responding. Last check: 2007-10-14)
Initial estimates suggest that the oil in place in the Visean Carbonate could be in the order of 40 to 50 mm barrels with recoverable reserves of 6 to 8 mm barrels.
However, the well logs also indicated that the higher Visean Carbonate was likely to be oil bearing and this zone was tested.
The Visean Carbonate was tested over an interval from 2,528 to 2,559 metres measured depth (2,431 to 2,451 total vertical depth).
www.gasandoil.com /goc/company/cnn04429.htm   (430 words)

  
 Welcome to Visean - The real-time specialists   (Site not responding. Last check: 2007-10-14)
About Us Contact Us Visean introduces the fastest, most secure way of collecting and sending all your drilling and well information from the rig to anywhere in the world, as it happens, 24 hours a day.
Visean offers the industry's most powerful and flexible data hub, compatible with all your wireline, mud logging and LWD service contractors.
Visean allows you to access information anywhere in the world, on a laptop or in the office.
southernarmada.org   (214 words)

  
 Welcome to Visean - The real-time specialists   (Site not responding. Last check: 2007-10-14)
In a relative short period, Visean has gained an impressive operational history in Asia and America.
Clients have recognised Visean's capabilities in providing excellent service and support irrespective of the geographic location of drilling operations and company offices.
Visean is able offer oil companies a truly global solution for managing their drilling operations and provide very best practice systems on both local and International operations.
southernarmada.org /director.asp?menu=5&submenu=&header=+About+Us   (130 words)

  
 waulsort
Precise paleotemperature measures are lacking for the Tournaisian-early Visean, however, some general statements can be made about the climates during this time.
According to the first-order climatic curve of Fischer (1982), the early Carboniferous (Tournaisian-early Visean) was a time of transition in long-term global regimen from a "greenhouse" world to an "icehouse" world.
From this fact we can infer that, during the Northern Hemisphere summer and early fall, the Tournaisian-early Visean ITCZ would have been situated somewhere over the southern part of the largely emergent Laurussian paleocontinent and, therefore, would not have generated any hurricanes and tropical storms which might have impinged upon southern Laurussian shelf systems.
www.auburn.edu /%7Ekingdat/waulsortian/waulsort.html   (5137 words)

  
 Afdeling Fysico-Chemische Geologie   (Site not responding. Last check: 2007-10-14)
Swennen R., Boonen P. and Viaene W., 1982, Stratigraphy and lithogeochemistry of the Walhorn section (Lower Visean; Vesder Basin, E-Belgium) and its implications.
Swennen R. and Viaene W., 1986, Occurrence of pseudomorphosed anhydrite nodules in the Lower Visean (Lower Moliniacian) of the Verviers synclinorium, E-Belgium.
Maes K., Peeters C., Muchez Ph., Swennen R. and Viaene W., 1988, The occurrence of paleosols in the Lower Visean of the Walhorn section (Vesder Basin, E-Belgium).
www.kuleuven.ac.be /geology/Fcg/Sediment/publications.htm   (1571 words)

  
 BSRG 2002   (Site not responding. Last check: 2007-10-14)
A seasonal humid climate was dominant in the mid-late Visean, reflected by the presence of many Gelysols, Podzols, Histosols and Vertisols.
Semi-arid conditions prevailed in the late Asbian – early Brigantian known from the presence of Aridisols and groundwater calcrete, and a reversion to humid / seasonal humid climate occurred from the mid Brigantian onwards.
This relationship however, is also found in some palaeosoils without evidenec of a major marine transgression, suggesting that there is a smaller-scale cyclicity leading to hanging base-level.
www.dur.ac.uk /kirstin.lemon/abs-bsrg2002ii.htm   (367 words)

  
 PUBLISHED PAPERS   (Site not responding. Last check: 2007-10-14)
To redefine a culmian formation of Andelska Hora, to document Visean age of this rapid diastrophic formation, to separate "variegated and condensed" sediments of "pre-culmian history" from these formation.
Authors have no doubt in the statement that the latest pebbles are Visean in age.
Age of all the AHF diastrophic sedimentation is very probably Visean, and perhaps not so early, because the examined pebbles originated from middle part of the AHF Culm accumulation.
www.gli.cas.cz /myweb/home/hladil/REF-Y/R-095.html   (376 words)

  
 Journal of Paleontology: Early carboniferous athyridid brachiopods from the Qaidam Basin, Northwest China
As a result, Lamellosathyris is considered to be indicative of late Famennian to Visean age, originating in late Famennian in central North America and Armenia of Russia, respectively.
Both Bruntonathyris and Lochengia are restrictedly Tournaisian to Visean in age, and probably originated in the Qaidam Basin.
Spirifer (Grandispirifer) mylkensis is characteristic of the late Tournaisian to early Visean in northwest China (Yang, 1964, 1990; Jin et al., 1979; Zhang et al., 1983).
www.findarticles.com /p/articles/mi_qa3790/is_200309/ai_n9295230   (1232 words)

  
 VISEAN
"VISEAN" is generally used as an adjective (general or positive) -- approximately 75.00% of the time.
"VISEAN" is used about 4 times out of a sample of 100 million words spoken or written in English.
Its rank is based on over 700,000 words used in the English language.
www.websters-online-dictionary.org /Vi/Visean.html   (283 words)

  
 Geoscience - Drummond basin   (Site not responding. Last check: 2007-10-14)
Playford (in Shell, 1988) identified Visean palynomorphs from drill core in a unit identified as Mount Hall Formation.
The unit is Visean as both younger and older rocks in the succession contain identifiable Visean palynomorphs.
The Mount Rankin Formation, which is restricted to the eastern side of the basin, comprises conglomerate, laminated siltstone, fine to very fine sandstone, chert, tuff, ignimbrite, and minor dacite to andesite (Withnall and others, 1995).
www.nrm.qld.gov.au /mines/petroleum_gas/geoscience/pg_db_geo_cycle3.html   (1940 words)

  
 PUBLISHED PAPERS   (Site not responding. Last check: 2007-10-14)
Several limestone pebbles of the Korenec conglomerate are Visean, especially Middle Visean.
Former stratigraphical concept of Protivanov Culm Formation (Late Tournaisian to Early Visean) was revised.
Main evidence for the Middle Visean age is based on foraminifers Archaediscus krestovnikovi, Eoparastafella simplex, A. cf.
www.gli.cas.cz /myweb/home/hladil/REF-Y/R-100.html   (383 words)

  
 Five Visean conodont horizons in the north of England -- Austin 105 (4): 367 -- Geological Magazine   (Site not responding. Last check: 2007-10-14)
Five Visean conodont horizons in the north of England
Five faunal lists of conodonts recovered from isolated Visean outcrops in the north of England are presented.
The fauna of the Bowland shale at Burnsall, Yorkshire, and that of the Orionastraea bed at Bordley, Yorkshire, are representative of the Gnathodus mononodosus assemblage zone.
geolmag.geoscienceworld.org /cgi/content/abstract/105/4/367   (132 words)

  
 Paleomagnetic results indicate pre-Permian counter-clockwise rotation of the southern Tamworth Belt, southern New ...
Visean ignimbrites from three fault-bounded blocks within the southern Tamworth Belt, southern New England Orogen, Australia, retain a prefolding high-temperature component of remanence, carried mainly by magnetite.
Paleomagnetic data indicate that the southern Tamworth Belt occupied low to moderate paleolatitudes during the early Carboniferous.
Normal and reversed polarities with low to moderate inclinations suggest that the steep, reverse polarity latest Carboniferous to earliest Permian overprint is absent from the high-temperature component data set.
www.agu.org /pubs/crossref/2002/2000JB000037.shtml   (444 words)

  
 A Comparison of Stratigraphic Architecture, Lithofacies, and Reservoir Quality in Adjacent Large and Small Isolated ...   (Site not responding. Last check: 2007-10-14)
The Tournasian - Visean C sequences form the transgressive leg of a second-order supersequence that resulted in near-drowning of both platforms.
The Visean B - Serpukhovian sequences comprise the regressive leg of the supersequence.
The Visean A sequence demonstrates that the spatial distances over which platform facies variations occur appears to be independent of platform size.
aapg.confex.com /aapg/cal2005/techprogram/A95258.htm   (368 words)

  
 LEUCOGRANITE
) in the axis of the Upper Visean volcano-plutonic trough (Folin massif
Like Upper Visean rhyodacites and microgranites, leucogranites derive from the anatectic melting of middle layers of the continental crust
The leucogranite emplacements are coeval or slightly follow the volcanic activity, as indicated by a radiometric age of 327+/-5 Ma obtained on the Pierre-Qui-Vire granite
perso.wanadoo.fr /jacques.delfour/leucogre.htm   (112 words)

  
 DAn's Journal -- Day
um chris kevin yesterday was fuckin crazy dude joey and alex were pissing me off so much dude can we borrow some visean is ur mom home when is she getting home hello why can't u tell me..
um hello u dumb fuck im at chris' hose not home i told u at 4oclock that i didn't know where the visean was and if i did i would of given it to u.
the joe the mexican wakes me up after the hardest day at school and is like wheres the visean and im like idfk in my room can't u see im trying to sleep and he like oh sry dude i just need it cuz i can't get cought stoned..
www.crazylife.org /users/heafty_d/2003/11/01   (342 words)

  
 Distortion of Crurithyris urei (Fleming) from the Visean rocks of Fife, Scotland, by compaction of the containing ...   (Site not responding. Last check: 2007-10-14)
Distortion of Crurithyris urei (Fleming) from the Visean rocks of Fife, Scotland, by compaction of the containing sediment -- Ferguson 36 (1): 115 -- Journal of Paleontology
Distortion of Crurithyris urei (Fleming) from the Visean rocks of Fife, Scotland, by compaction of the containing sediment
The subtle deformation of crurithyrid shells from Visean (Carboniferous) shale of Fife, Scotland, is described as an example of the confusion which can be caused by using external form as a taxonomic criterion for small, thin-shelled fossils, without regard to their position relative to bedding planes, lithologic factors,and the probability of shell distortion.
jpaleontol.geoscienceworld.org /cgi/content/abstract/36/1/115   (135 words)

  
 DLESE description of Probable Influence of Geography on the Development and Global Distribution of Tournasian-early ...   (Site not responding. Last check: 2007-10-14)
This is a research paper on the occurrence of Waulsortian mounds, also known as Tournasian-early Visean mud mounds.
This paper suggests that lack of storm energy in two large areas of Laurussia provided long-term stability and thus enhanced the growth prospects of the frame-deficient Waulsortian and Waulsortian-like mud mounds.
An extensive bibliography and figure of the Visean geography showing locations of Waulsortian and Waulsortian-like mounds are also provided.
www.dlese.org:8080 /dds/catalog_DLESE-000-000-000-798.htm   (193 words)

  
 Petrographical types of the visean coals in the Kama basin. Atlas.   (Site not responding. Last check: 2007-10-14)
Petrographical types of the visean coals in the Kama basin.
The most recent studies have yielded some new detailed data on the coal content in the basin, its total resources and quality.
Major petrographic and petrogenetic types of the Visean coal are illustrated by the original microphotographs.
www.kcn.ru /tat_en/university/news/kniga16.htm   (160 words)

  
 [No title]   (Site not responding. Last check: 2007-10-14)
The Visean transgression is well known in the main part of noe northern Morocco, where it was synchronous with faulting.
At that time the Khenifra area, divided into pre-Visean blocks, was covered with a shallow sea, making an opportunity for developing this transgression in stages.
Here, the Visean overlies the pre-Visean terrains through a major unconformity during at least four transgressive phases: (1) V
www.elsevier.com /cdweb/journals/08995362/articles/25/3/S089953629700111.abstract.en   (145 words)

  
 volume_6_1-2.htm
Paleoecology and sedimentological interpretation of the "fl marble" of Denée (Lower Visean; Belgium).
During the Lower Visean, the "fl marble" deposited in a confined basin bordered to the south by the Waulsortian mud mounds, and progressively filled by calcareous sediments, probably turbiditic, coming from the transition area between the DSA to the south and the Condroz sedimentation area to the north.
During lowstand periods, the paleoenvironment was submitted to anoxic/dysoxic conditions which developed due to confinement by the Waulsortian buildups.
www.ulg.ac.be /geolsed/GB/volume_7_1-2.htm   (1861 words)

  
 Preliminary statement on Mississippian calcareous foraminiferal successions of the Midcontinent (U.S.A.) and their ...   (Site not responding. Last check: 2007-10-14)
The appearance of the latter may mark the base of the Valmeyeran (Osagean) series as well as approximate the boundary between the middle and late Tournaisian in the Dinant region of Belgium.
The disappearance of Eoendothyranopsis in the upper St. Louis Limestone is followed by the introduction of late Visean asteroarchaediscins, Neoarchaediscus and Asteroarchaediscus, in the late Valmeyeran (late Meramecian) type Ste.
The latter occurrences may mark the transition from Visean to Namurian faunas.
www.schweizerbart.de /pubs/journals/0078-0421/paper/11/136   (404 words)

  
 Geological Structure and oil end Gas bearing potential of Dnepr-Donetsk Depression ATLAS CONTENTS   (Site not responding. Last check: 2007-10-14)
Hypsometry of the surface of the crystalline basement, Scale 1:1,000,000 7.
Structural map of the bottom of the Upper Visean Sub-stage sediments, lower part of the Carboniferous Section, Scale 1:1,000,000 8.
Generalized stratigraphic section of Upper Visean - Serpukhov oil and gas bearing complex - Lower Carboniferous, Scale 1:2,500 47.
www.eastoil.com /dddatlco.htm   (953 words)

  
 THE “AGE OF CRINOIDS”: A MISSISSIPPIAN BIODIVERSITY SPIKE COINCIDENT WITH WIDESPREAD CARBONATE RAMPS
Phanerozoic crinoids reached their highest generic richness and overall abundance during the Mississippian, which has thus been dubbed the “Age of Crinoids.”  Generic richness during the Visean (175) was 260% of the stage average (67) during the Ordovician-Permian, based on Sepkoski’s (2002) compilation.
  First, in the wake of the Late Devonian mass extinction event, the five major crinoid clades re-radiated in the Early Mississippian, particularly the camerates, which reached their Paleozoic peak (52) in the Visean.
  The advanced cladids also continued to radiate from their origin in the Early Devonian and reached a peak in the Visean (76) that was not exceeded again until the Moscovian (100).
www.geo.wvu.edu /~kammer/GSA2004.htm   (323 words)

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