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Barail Formation

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Journal Article
Journal: GSA Bulletin
Published: 01 April 1998
GSA Bulletin (1998) 110 (4): 497–511.
..., and Barail Formations document compositions that are dominated by subangular monocrystalline quartz grains with scarce to no feldspar grains, and few lithic fragments (Cherra and Kopili: Qt 99 F 1 L 0 ; Barail: Qt 90 F 3 L 7 ; Qt—total quartz, F—feldspar, L—lithic fragments). These compositions are similar...
Journal Article
Journal: GSA Bulletin
Published: 01 March 2000
GSA Bulletin (2000) 112 (3): 435–449.
...) and Bangladesh (Kopili, Barail Formations; Surma Group) indicates diachronous arrival of ophiolitic to low-grade metamorphic detritus derived respectively from the Indus Suture and early Himalayan thrust sheets in the north. This is consistent with progressively later closure of Neotethys along the suture, from...
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Journal Article
Published: 01 May 1998
Journal of Sedimentary Research (1998) 68 (3): 465–472.
... constraints. Quartzose sandstones of the Eocene Kopili and Oligocene Barail Formations contain only 0.2% heavy minerals, comprising abundant opaque minerals and stable minerals such as tourmaline, garnet, rutile, and zircon. This assemblage suggests sediment sources dominated by low- to intermediate-grade...
Journal Article
Journal: GSA Bulletin
Published: 01 November 1991
GSA Bulletin (1991) 103 (11): 1513–1527.
... was located in the distal part of a foreland basin paired to the Indo-Burman ranges. Oligocene fluvial-deltaic strata (Barail Formation) were derived from incipient uplifts in the eastern Himalayas. Subsidence increased markedly in the Miocene epoch in response to western encroachment of the Indo-Burman...
Image
( a ) QFL and ( b ) lithic plot for Palaeogene and Neogene samples from the...
Published: 01 December 2008
Fig. 2.  ( a ) QFL and ( b ) lithic plot for Palaeogene and Neogene samples from the Indo-Burman Ranges compared with petrographic assemblages of the Oligocene Barail Formation of the Bengal Basin, and Himalayan foreland basin rocks of the Eocene Bhainskati Formation, the Miocene Dumre Formation
Journal Article
Journal: AAPG Bulletin
Published: 01 March 1980
AAPG Bulletin (1980) 64 (3): 427–430.
... are in the Oligocene Barail formation and Miocene Tipam formation. The oils are heavy and characterized by high (10 to 15%) wax range C 22 -C 36 n-paraffin content ( Table 1 ). Wide variations in wax content are present both vertically and laterally. FIG. 1 —Location of oil fields in Assam basin, India...
FIGURES
Image
ϵ Nd (0) values for Palaeogene and Neogene samples from the Indo-Burman Ran...
Published: 01 December 2008
Fig. 3.  ϵ Nd (0) values for Palaeogene and Neogene samples from the Indo-Burman Ranges (IBR) compared with data from the Himalayan-derived foreland and remnant ocean basin rocks (Bhainskati Formation, Dumre Formation, Barail Formation and Siwalik Group) as well as modern river samples from
Journal Article
Journal: AAPG Bulletin
Published: 01 December 2002
AAPG Bulletin (2002) 86 (12): 2023–2045.
... Eocene to lower Oligocene Barail Group, which is composed of sandstones of the Tinali Formation and overlying mudstones and coals of the Moran Formation that were deposited in a marginal-marine to fluvial setting along the southeast-facing continental margin. The close of Barail deposition was followed...
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Journal Article
Journal: AAPG Bulletin
Published: 01 September 1981
AAPG Bulletin (1981) 65 (9): 1633–1641.
... of clastic sediments. Study of the regional lithologic pattern shows that thickness of the recent alluvium-Dhekiajuli rocks is constant, whereas older formations (Girujan Clay, Tipsam-Surma, Barail, and pre-Barail) appear to thicken to the southeast and east. The Girujan Clay, which is practically absent...
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Journal Article
Journal: AAPG Bulletin
Published: 01 April 1973
AAPG Bulletin (1973) 57 (4): 642–654.
... is divided into two supergroups—the Naga and Brahmaputra—separated by a major unconformity. The Naga Supergroup, containing shallow marine to paralic sediments of Paleogene age, comprises the Jaintia and Barail Groups. The Jaintia Group includes the Teok Formation, Sylhet Limestone, and Kopili Formation...
FIGURES
Journal Article
Journal: AAPG Bulletin
Published: 01 December 1965
AAPG Bulletin (1965) 49 (12): 2282–2288.
.... Metall. Soc. India, Bull. 26 , p. 1 – 26 . Biswas , B. , 1962 , Stratigraphy of the Mahadeo, Langpar, Cherra and Tura Formations, Assam, India : Geol. Min. Metall. Soc. India, Bull. 25 , p. 1 – 34 . Dunbar , C. O. , and Rodgers , J. , 1958 , Principles of stratigraphy...
FIGURES
Journal Article
Journal: AAPG Bulletin
Published: 01 December 1968
AAPG Bulletin (1968) 52 (12): 2422–2437.
..., in most places, passes imperceptibly into the Barail Group. This is clearly pointed out by Evans (1964) , who stated that the lowest Barail beds (Laisong and Naogaon Formations) vary considerably in thickness, probably because of their lateral passage into Disang shales. Even though for the most part...
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Journal Article
Journal: The Leading Edge
Published: 01 January 2012
The Leading Edge (2012) 31 (1): 18–22.
... Formation in some places) and the Upper Barail Coal-Shale Unit (BCS), also called Rudrasagar Formation. The Barail Arenaceous Unit is predominantly sandstone with thin subordinate shale beds deposited in a high-energy, brackish-water, delta-front environment. The BCS is predominantly shale with subordinate...
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Image
—Geologic cross section across eastern Himalayas, Brahmaputra Valley, and N...
Published: 01 January 1982
, in geosynclinal facies, Naga Hills; Disang may range in age up to late Cretaceous. 3a, Yinkiong Formation (?upper Paleogene-lower Neogene), lithologically similar and possibly correlatable with Disang Barail sequence of Naga Hills and Simla Group of western Himalayas. B, Barail Group; T, Tipam Group. Barail
Journal Article
Journal: AAPG Bulletin
Published: 01 January 1949
AAPG Bulletin (1949) 33 (1): 1–21.
... of differentiating oil, gas, and water-bearing sands in electrical surveys because of the low salinity of the formation waters, paraffination, loss of circulation while drilling, and migration of oil into the structure from the Barail (Eocene-Oligocene) beds below. 1 Manuscript received, July 30, 1948...
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Journal Article
Published: 01 December 2008
Journal of the Geological Society (2008) 165 (6): 1045–1057.
...Fig. 2.  ( a ) QFL and ( b ) lithic plot for Palaeogene and Neogene samples from the Indo-Burman Ranges compared with petrographic assemblages of the Oligocene Barail Formation of the Bengal Basin, and Himalayan foreland basin rocks of the Eocene Bhainskati Formation, the Miocene Dumre Formation...
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Journal Article
Journal: Geophysics
Published: 03 December 2009
Geophysics (2009) 74 (6): WCC129–WCC140.
... deltaic Barail Group. The lower Paleogene begins with transgression on Precambrian basement in an essentially restricted marine setting, followed by marginal to marine mixed clastics and carbonates of Early to Mid-Eocene sediments, and finally the open marine Kopili Formation, which is the regional seal...
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Journal Article
Published: 17 November 2020
Journal of Sedimentary Research (2020) 90 (9): 1244–1263.
.... Sediments in the Burma accretionary wedge near latitude 23.5° N record an evolution from Late Cretaceous to Paleocene deep marine conditions of the Disang Formation (Nandy 1999) to syn-Himalayan (Oligocene-present) shallow-marine and intertidal facies of the Barail (Oligo-Miocene) and Surma groups (Miocene...
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Journal Article
Journal: AAPG Bulletin
Published: 01 January 1982
AAPG Bulletin (1982) 66 (1): 57–70.
..., in geosynclinal facies, Naga Hills; Disang may range in age up to late Cretaceous. 3a, Yinkiong Formation (?upper Paleogene-lower Neogene), lithologically similar and possibly correlatable with Disang Barail sequence of Naga Hills and Simla Group of western Himalayas. B, Barail Group; T, Tipam Group. Barail...
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Journal Article
Journal: AAPG Bulletin
Published: 01 February 2001
AAPG Bulletin (2001) 85 (2): 309–323.
... is an important onshore petroleum province in India. The basin has been producing oil and gas for more than a century, mainly from Barail group (upper Eocene-Oligocene) and Tipam Formation (Miocene) reservoirs, and is extensively studied. In recent years, commercial hydrocarbon accumulations have been discovered...
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