Relevant bibliographies by topics / Permian glacigenes

Academic literature on the topic 'Permian glacigenes'

Author: Grafiati
Published: 10 December 2022
Last updated: 29 January 2023

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Journal articles on the topic "Permian glacigenes"

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Stephenson, Michael H., Irfan U. Jan, and Sa'ad Zeki A. Kader Al-Mashaikie. "Palynology and correlation of Carboniferous–Permian glacigene rocks in Oman, Yemen and Pakistan." Gondwana Research 24, no. 1 (July 2013): 203–11. http://dx.doi.org/10.1016/j.gr.2012.06.005.

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Kar, Ratan. "A basal Gondwana palynoflora from the glacigene sediments of Tatapani-Ramkola Coalfield, India." Journal of Palaeosciences 61, no. (1-2) (December 31, 2012): 131–38. http://dx.doi.org/10.54991/jop.2012.293.

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Palynological studies were undertaken on the sediments of Talchir Formation exposed along a stream cutting in the Tatapani-Ramkola Coalfield, Chhattisgarh State, India. The glacigenic nature of the Talchir Formation is evident, as manifested by the presence of lithified tillites, varves and rafted boulders. The varve clays have yielded a well preserved assemblage rich in radial monosaccates. The assemblage is dominated by Plicatipollenites (26-31%) with a sub-dominance of Parasaccites (8-22%). Potonieisporites, Virkkipollenites, Caheniasaccites and Sahnites are the other important constituents. The recovered palynoflora is characteristic of Plicatipollenites-Parasaccites palynoassemblage, which represents Lower Talchir palynozone and is of early Permian age.
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Babcock, Loren E., John L. Isbell, Molly F. Miller, and Stephen T. Hasiotis. "New late Paleozoic conchostracan (Crustacea: Branchiopoda) from the Shackleton Glacier Area, Antarctica: Age and paleoenvironmental implications." Journal of Paleontology 76, no. 1 (January 2002): 70–75. http://dx.doi.org/10.1017/s0022336000017364.

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Lake deposits of the Pagoda Formation (Upper Carboniferous?-Lower Permian) at Mt. Butters, Shackleton Glacier area, central Transantarctic Mountains, Antarctica, yield a low diversity biota including a new species of conchostracan, Cyzicus (Lioestheria) shackletonensis. Locally, conchostracans occur in large numbers near the tops of thin coarsening-upward cycles in siliciclastic sediments. Regionally, the Pagoda Formation consists of glacigenic deposits of the Gondwanide ice sheet that covered much of the land in southern high latitudes. At Mt. Butters, the lake deposits document the presence of an ice-margin lake in front of the advancing ice sheet. Deposition from suspension within the lake was interrupted by introduction of sand and silt deposited in the conchostracan-bearing, upward-coarsening sequences. Conchostracans of the Pagoda Formation are associated with other arthropods (euthycarcinoids and ostracodes), and wood fragments; burrows produced by small animals moving just beneath the sediment surface are abundant in some horizons. Few conchostracan occurrences are known from the Carboniferous-Permian of Antarctica; this is the second recorded occurrence, and it increases the number of described species to three.
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Percival, I. G., and P. M. Cooney. "PETROLEUM GEOLOGY OF THE MERLINLEIGH SUB-BASIN, WESTERN AUSTRALIA." APPEA Journal 25, no. 1 (1985): 190. http://dx.doi.org/10.1071/aj84017.

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Esso's recent drilling program in the Merlinleigh Sub-basin, onshore Carnarvon Basin, represents the culmination of the first phase of concerted exploration activity in the area since the WAPET era of the 1960s. The region is unusual among Australian petroleum provinces in having excellent exposures of reservoir, source and seal rocks of Palaeozoic age. While both Esso wells (Burna 1 and Gascoyne 1) failed to encounter hydrocarbons in the primary Wooramel Group play, encouraging potential still exists. The reservoir in the Wooramel Group play is the Early Permian Moogooloo Sandstone, a fluviodeltaic to nearshore sheet-sand facies with porosities to 23 per cent and permeabilities in excess of 100 millidarcys. Likely hydrocarbon sources are siltstones in the overlying Byro Group, with total organic carbon contents averaging 3 per cent, and calcilutites in the subjacent Callytharra Formation with similar organic content. Locally, the Jimba Jimba Calcarenite Member (Billidee Formation) and the Cordalia Sandstone also provide rich source units. The least certain aspects of the Early Permian play are fault and top seal, and reservoir quality at depth. Notwithstanding the relatively shallow depths to source strata in the area, vitrinite reflectance analyses from drill cores indicate that maturation is attained as shallow as 900 m on the folded and faulted western margin of the sub-basin, and at an approximate depth of 1200 m in the depocentre beneath the Kennedy Range. This can be related to high regional heat flow, and to erosion of some 1500-2000 m of sediments prior to the regional Early Cretaceous transgression.Older plays which have been identified in the area remain to be adequately evaluated. Potential reservoir sands are present in the Silurian Tumblagooda Sandstone, the Middle and Late Devonian Nannyarra and Munabia Sandstones, and the Early Carboniferous Williambury Formation. Possible source rocks include carbonates of Middle Devonian and Early Carboniferous age. One of the objects of current research has been to locate areas where seal, provided by the glacigene Lyons Formation of Late Carboniferous-Early Permian age, is sufficiently thin to permit economic drilling.
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Koch, Zelenda J., and John L. Isbell. "Processes and products of grounding-line fans from the Permian Pagoda Formation, Antarctica: Insight into glacigenic conditions in polar Gondwana." Gondwana Research 24, no. 1 (July 2013): 161–72. http://dx.doi.org/10.1016/j.gr.2012.10.005.

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Bajpai, Usha. "Morphological trends in Gondwana plants." Journal of Palaeosciences 40 (December 31, 1991): 128–46. http://dx.doi.org/10.54991/jop.1991.1771.

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The term Gondwana has recently been redefined to include the group of terrestrial rocks in the Indian Craton, that was initiated with a basal Permian glacigene epoch and terminated with the large hiatus at the top of the Triassic. The Gondwana Supergroup as redefined now comprises Talchir, Damuda, Panchet and Mahadeva groups and ranges in age from the earliest Permian to latest Triassic or earliest Jurassic (Venkatachala & Maheshwari, 1991). The vegetational scenario of Gondwana shows mixture of plants belonging to quite distinct habitats. The morphological adaptations of plants that thrived at all levels on land, in continental water, upland and in environments of exceeding dryness are significant. Leaf size varies from small to large with variety of apex and base, midribless to prominent midrib, non-petiolate to petiolate, veins loosely arranged, narrow mesh type of venation to open mesh and narrow mesh type. Leaf cuticle of glossopterids also shows variations. Most of the Gondwana woods show variation in pith and primary xylem and secondary xylem. Pith varies from homo- to hetero-cellular. Primary xylem shows variation from endarch to mesarch. The secondary xylem is pycnoxylic, homoxylous. Secondary xylem shows well-marked growth rings. There is a great variation in the pitting of secondary tracheids. Xylem rays vary from uni- to multi-seriate. The ray field-pits also show diversity. Wide diversities are also seen in the morphology of pteridophytic megaspores and of reproductive organs of gymnosperms. The exosporium of megaspore is either smooth or variously ornamented. The mesosporium is with or without cushions. Reproductive organs are known only for the glossopterid group and are of two types. The changing patterns in leaves, woods, megaspores and reproductive organs of Gondwana plants may provide significant data for charting of morphotrends in these organs. It can probably also be established if these morphotrends were ecologically controlled temporary and transient phase or were genetically controlled leading to evolution of new types.
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Stone, Philip. "Geology reviewed for the Falkland Islands and their offshore sedimentary basins, South Atlantic Ocean." Earth and Environmental Science Transactions of the Royal Society of Edinburgh 106, no. 2 (June 2015): 115–43. http://dx.doi.org/10.1017/s1755691016000049.

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ABSTRACTThe position of the Falkland Islands adjacent to the South American continental margin belies the close association of their geology with that of South Africa. A Mesoproterozoic basement is unconformably overlain by a Silurian to Devonian succession of fluvial to neritic and shallow marine, siliciclastic strata. This is disconformably succeeded by a largely Permian succession that, near its base, includes a glacigenic diamictite and, thence, passes upwards into a succession of deltaic and lacustrine strata. The lithological succession and the character of its deformation bear striking similarities to the Cape Fold Belt and Karoo retroarc foreland basin. Swarms of Early Jurassic dykes were coeval with the Karoo magmatism and the initial break-up of Gondwana; Early Cretaceous dykes were intruded during the opening of the South Atlantic Ocean. Offshore sedimentary basins surrounding the archipelago contain Late Jurassic to Palaeogene successions and are currently the focus of hydrocarbon exploration. Best known is the North Falkland Basin, a classic failed rift. To the SE, the passive margin, Falkland Plateau Basin may also be rift-controlled, whilst the South Falkland Basin is a foreland basin created at the boundary of the South American and Scotia plates. The role of the Falkland Islands during the breakup of Gondwana remains controversial. Compelling evidence from the onshore geology favours rotation of an independent microplate from an original position adjacent to the Eastern Cape, South Africa. Alternative interpretations, justified largely from offshore geology, favour extension of the Falkland Plateau as a fixed promontory from the South American margin.
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Rubin, Francine. "The physical environment and major plant communities of the Tankwa- Karoo National Park." Koedoe 41, no. 2 (February 19, 1998). http://dx.doi.org/10.4102/koedoe.v41i2.253.

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Apart from Acocks (1988) there are no published descriptions of the vegetation of the greater Tanqua and Doring River drainage basin (Bayer et al. 1993). A botanical and physical description of the Tankwa- Karoo National Park (TKRNP) which occurs in Veldtype 31b (Acocks 1988) is provided. The three dominant geological formations, older glacigenic deposits of the Dwyka Group, followed by the succession of siliciclas- tic sediments of the Permian Ecca Group, with flat dolerite sills and dykes, underlie eight distinct plant communities. The plant communities can be divided into large open plains dominated by Galenia africana and Tripteris sp. in the erosion rills, Malephora luteola and Augea capensis common in the low lying areas and Zygophyllum microcarpum, Brownanthus ciliatus and Galenia crystallina common on the more shaly concave plains and low shale hills. Slightly elevated rocky areas are dominated by Ruschia cf. robusta, Ruschia spinosa communities, while crusts of stemless mesembs such as Rhinephyllum macra denium, Hereroa fimbriata and Cheiridopsis acuminata are found on the desert paved areas. Annual Asteraceae covers all the denuded and sparsely vegetated areas after good winter rains while annual mesembs colonise on the more sodic sites. A total of 259 plant species were collected sporadically over a period of eight years, this includes 65 succulents and seven species endemic to the Tanqua Karoo and immediate adjacent area of the Roggeveld Mountain Range and Sutherland. Four Tanqua Karoo endemic species were found in the park.
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Dissertations / Theses on the topic "Permian glacigenes"

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Geiger, Markus. "The Geology of the southern Warmbad Basin Margin - Tephrostratigraphy, Age, Fossil Record and Sedimentary Environment of Carboniferous-Permian Glacigenic Deposits of the Dwyka Group, Zwartbas, southern Namibia." Master's thesis, 2000. https://nbn-resolving.org/urn:nbn:de:bvb:20-opus-46251.

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At Zwartbas, about 10 km west of Vioolsdrif, southern Namibia, the Dwyka succession is composed of tillites and distal fossiliferous dropstone-bearing glacio-marine shales. The completely exposed Dwyka succession is interbedded with thin bentonites, altered distal pyroclastic deposits, which were derived from the magmatic arc at the southern rim of Gondwana. Dropstone-bearing and dropstonefree sequences intercalate with four diamictites, of which the two lowest were certainly recognised as tillites. Four events of deglaciation were proven at Zwartbas and thus consist with correlative deposits in southern Africa. Numerous fossilised fishes, trace fossils, and plant fragments appear frequently within the lower half of the Dwyka succession whereas trace fossils were principally found in the complete succession. Although the environmental determination is quite problematic, the fossil assemblage rather implies proximal, shallow water conditions with temporary restricted oxygenation. The hinterland was covered with considerable vegetation, which points to a moderate climate. Water salinity determinations based on shale geochemistry rectify contrary palaeontological results and point to rather brackish or non-marine conditions in comparison to present-day salinites. Geochemical analyses of the bentonites relate the pyroclastic deposits with acid to intermediate source magmas, as they are known from the magmatic arc in present-day Patagonia. Tectono-magmatic comparisons furthermore emphasise a syn-collision or volcanic-arc situation of the magma source. However, significant cyclicity in the production of the pyroclastic deposits was not observed. Radiometric age determinations of two tuff beds clearly date the onset of glacial activity into the Late Carboniferous.
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Book chapters on the topic "Permian glacigenes"

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Isbell, John L., Zelenda J. Koch, Gina M. Szablewski, and Paul A. Lenaker. "Permian glacigenic deposits in the Transantarctic Mountains, Antarctica." In Special Paper 441: Resolving the Late Paleozoic Ice Age in Time and Space, 59–70. Geological Society of America, 2008. http://dx.doi.org/10.1130/2008.2441(04).

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Stephenson, Michael H. "A review of the palynostratigraphy of Gondwanan Late Carboniferous to Early Permian glacigene successions." In Special Paper 441: Resolving the Late Paleozoic Ice Age in Time and Space, 317–30. Geological Society of America, 2008. http://dx.doi.org/10.1130/2008.2441(22).

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