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coal gaps

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Journal Article
Journal: GSA Bulletin
Published: 01 February 1996
GSA Bulletin (1996) 108 (2): 195–207.
...Gregory J. Retallack; John J. Veevers; Ric Morante Abstract Early Triassic coals are unknown, and Middle Triassic coals are rare and thin. The Early Triassic coal gap began with extinction of peat-forming plants at the end of the Permian (ca. 250 Ma), with no coal known anywhere until Middle...
Journal Article
Journal: PALAIOS
Published: 28 June 2022
PALAIOS (2022) 37 (6): 292–317.
... ‘coal gap' of the Early Triassic. Fig. 2.— Geological maps of eastern Australian fossil localities. A ) Map of Australia. B ) Simplified geological map of the Sydney Basin, with distributions of Permian and Triassic strata; updated from Fielding et al. (2019) . C ) Geological map...
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Journal Article
Journal: Geology
Published: 30 March 2020
Geology (2020) 48 (6): 609–613.
... complex lacustrine ecosystem after the EPME and suggest that Triassic lacustrine ecosystems took at most 10 m.y. to recover fully, which is consistent with the termination of the “coal gap” that signifies substantial restoration of peat-forming forests. The end-Permian mass extinction (EPME; ca. 252...
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First thumbnail for: Recovery of lacustrine ecosystems after the end-Pe...
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FIGURE 3. Temporal and geographic distribution of stratigraphic gaps in the late Desmoinesian–early Missourian ( = late Moscovian–early Kasimovian) of the United States. A) Chronostratigraphic diagram showing correlation of marine units and coals in key cyclothems above and below the gap across central and eastern United States. Correlations are based on conodont biostratigraphic events: 1  =  First Appearance Datum (FAD) of Idiognathodus confragus in a major cyclothem; 2  =  FAD, I. cancellosus; 3  =  FAD, I. eccentricus; 4  =  Dominance of Swadelina nodocarinata and sole appearance of Gondolella magna; 5  =  FAD, S. neoshoensis; 6  =  Last Appearance Datum (LAD) of I. delicatus. Vertical scale is based on inferred 400 kyr cyclothem groupings of Heckel (2008). Different names (with dashes) are used in different parts of the basin. C  =  coal. Mason Coal refers to sparse local coals across the Appalachian Basin in that general position, including those in New Galilee unit. Correlations of lower and upper parts of Farmington Shale and associated coals in the Illinois Basin are not yet completely resolved. Dashed boundary between Moscovian and Kasimovian stages is the one currently used, but is not necessarily the boundary that will ultimately be selected. B) Lateral changes in the magnitude of the gap (in gray) shown in Figure 3A across the basins from west (left) to east and comparison with the average gap seen at a typical sequence boundary.
Published: 01 March 2011
FIGURE 3. Temporal and geographic distribution of stratigraphic gaps in the late Desmoinesian–early Missourian ( = late Moscovian–early Kasimovian) of the United States. A) Chronostratigraphic diagram showing correlation of marine units and coals in key cyclothems above and below the gap across
Journal Article
Published: 01 May 2025
Jour. Geol. Soc. India (2025) 101 (5): 581–590.
... in the thrown-out fly ashes, India may be joining the leading REEs producers of the world. The current challenges in the field of extraction of REEs from coal fly ash centres around the sustainability, feasibility and scalability of the processes adopted for extraction. The research gap of techno-economic...
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Published: 01 January 2006
DOI: 10.1130/2006.2399(12)
... Dedicated to the memory of William T. Holser, colleague and friend. A gap in the fossil record of coals and coral reefs during the Early Triassic follows the greatest of mass extinctions at the Permian-Triassic boundary. Catastrophic methane outbursts during terminal Permian global mass...
Journal Article
Published: 01 October 2024
Jour. Geol. Soc. India (2024) 100 (10): 1385–1394.
...Bodhisatwa Hazra; Prakash K. Singh; Chinmay Sethi; Jai Krishna Pandey ABSTRACT Application of coal petrology is known to play significant role in several industrial sectors viz. thermal industries, steel industries, unconventional oil and gas fields. One important aspect of organic matter...
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First thumbnail for: Application of Optical-electron Correlative Micros...
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Journal Article
Journal: Lithosphere
Publisher: GSW
Published: 18 October 2022
Lithosphere (2022) 2022 (1): 5446117.
... and accumulation potential. The middle-lower Jurassic coal-bearing mudstone is gas prone, while the mudstone of the Callovian-Oxfordian gap layer is oil prone, and the organic matter type of Callovian-Oxfordian carbonate rocks is the mixed type between the two previous source rocks. The interpretation schemes...
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First thumbnail for: Origin and Characteristics of the Crude Oils and C...
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Journal Article
Journal: AAPG Bulletin
Published: 01 October 1952
AAPG Bulletin (1952) 36 (10): 1913–1961.
... Gap, Wyoming, 15 miles south of Frontier, the lower half of the Frontier formation consists of non-marine sandstone, siltstone, mudstone, and water-laid volcanic rocks with some coal, carbonaceous shale, and limestone. The upper half of the formation consists of marine sandstone, siltstone, and shale...
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First thumbnail for: Frontier Formation, Wyoming and Adjacent Areas
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Series: Geological Society, London, Special Publications
Published: 17 July 2024
DOI: 10.1144/SP546-2023-40
EISBN: 9781786206435
... to vertical stress estimates when using offset check-shot surveys as proxies in a best-case scenario; and develop a workflow that utilizes multiple wireline logging datasets, mud logging and geological knowledge of coal bedding–boundary rock transition ‘grading’ to improve interpolation between data gaps...
Image
Coal mine: comparison of time migration images (a) without and (b) with interpolation for a 3D survey acquired on top of a large gap.
Published: 25 November 2009
Figure 12. Coal mine: comparison of time migration images (a) without and (b) with interpolation for a 3D survey acquired on top of a large gap.
Journal Article
Journal: PALAIOS
Published: 01 March 2011
PALAIOS (2011) 26 (3): 125–139.
...FIGURE 3. Temporal and geographic distribution of stratigraphic gaps in the late Desmoinesian–early Missourian ( = late Moscovian–early Kasimovian) of the United States. A) Chronostratigraphic diagram showing correlation of marine units and coals in key cyclothems above and below the gap across...
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First thumbnail for: NO MAJOR STRATIGRAPHIC <span class="search-highlig...
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Lithostratigraphy and tectonic events on the northeastern Laptev Sea shelf, after Malyshev et al. [2024b], with the use of materials from Golionko et al. [2019] and Verzhbitskii et al. [2024]. 1 – clay; 2 – siltstone, silt; 3 – sandstone, sand; 4 – coarse-grained deposits; 5 – limestone; 6 – coal, carbonaceous deposits; 7 – angular unconformity; 8 – sedimentation gap; 9 – reflecting-horizon index; 10 – glacial dislocations; 11 – predicted sedimentary complexes; 12 – extension; 13 – compression, deformed deposits.
Published: 25 June 2025
; 5 – limestone; 6 – coal, carbonaceous deposits; 7 – angular unconformity; 8 – sedimentation gap; 9 – reflecting-horizon index; 10 – glacial dislocations; 11 – predicted sedimentary complexes; 12 – extension; 13 – compression, deformed deposits.
Series: Geological Society, London, Special Publications
Published: 01 January 2015
DOI: 10.1144/SP404.14
EISBN: 9781862396807
... evenly in the sequence (between bedding layers, erosionally based channels etc.) or whether the gaps are more systematic, as suggested by DiMichele & Falcon-Lang (2011) . If climate is the main control on the development of coal-bearing sequences, and these are related to distinct climate cycles...
Series: AAPG Studies in Geology
Published: 01 January 1993
DOI: 10.1306/St38577C2
EISBN: 9781629811048
...” sediments. This uni- discipline-research approach has fragmented and confused efforts to understand this century-old problem (Schaler, 1885; Stevenson, 1910). However, attempts to bridge the interdisciplinary gap during the past few decades have produced new insights on the nature and origin of coals...
Journal Article
Journal: AAPG Bulletin
Published: 01 September 1966
AAPG Bulletin (1966) 50 (9): 2031–2032.
... to create pressure on domestic supply by 1980. The gap between supply and demand in the period beyond 1980 may be filled in part by substitution of electricity for gas and by synthetic oil and pipeline gas derived from coal or oil shale. Research activities in these fields have been in progress for more...
Journal Article
Published: 01 June 2020
Journal of Environmental and Engineering Geophysics (2020) 25 (2): 245–254.
... surrounding the competent coal seam. However, the three-dimensional wave field characteristics of small fault advanced detection in the condition of the loose circle of coal roadway have not examined. In this paper, numerical modeling and field tests were conducted to address this knowledge gap. The results...
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Series: Geological Society, London, Special Publications
Published: 06 June 2023
DOI: 10.1144/SP535-2022-189
EISBN: 9781786205193
... the west European coal-bearing sequences where correlation depended heavily on the biostratigraphy of the floras, which show significant global provincialism (e.g. Vakhrameev et al. 1978 ; Meyen 1987 ; Cleal 1991 ; Opluštil et al. 2021 a ). Nevertheless, because of the economic importance...
Series: Geological Society, London, Special Publications
Published: 01 January 2002
DOI: 10.1144/GSL.SP.2002.198.01.18
EISBN: 9781862394469
.... This information helps to fill in some of the ‘knowledge gaps’ and provide a tool for use in the prediction of future surface mine water emissions and in the formulation of treatment-mitigation strategies. The current work uses observations and interpretations of the hydrochemistry of the coal Measures to develop...
Journal Article
Published: 01 March 2017
Jour. Geol. Soc. India (2017) 89 (3): 307–314.
..., there exist sufficient coal reserves in India, continuous acquisition and possession of coal bearing land is required to minimize the existing gap prevailing between coal demand and supply. The solution of the problem lies not only in modification of laws and policies of industry, but also in modification...
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First thumbnail for: A New Model of Exact Reclamation of Post-mining La...
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