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Dalong Formation

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Stratigraphy of the Dalong Formation (Fm.) in the Lower Yangtze region. (A) Northeast-southwest cross sections. (B) Northwest-southeast cross sections. The cross-section transects are shown in Figure 1D. The lithostratigraphic and total organic carbon (TOC) data are from Chen et al. (2013) (Majiashan [MJS] section), Yuan (2018) (Changcan 1 [CC1] and Huiye 1 [HY1] cores), Kang (2019) (Hecan 1 [HC1] core), Xu et al. (2020) (Gangdi 1 [GD1] core), and this study (Qinglongshan [QLS] section and 3-4-7, Guanzhuang 1 [GZ1], and Xi 2 [X2] cores). The vertical red dashed lines indicate the TOC content of 2 wt.%, which is assumed to be required for shale gas development in terms of organic richness. The dark blue dashed lines represent stratigraphic correlation between different sections. The y axis units are in meters. LM = lower member; MM = middle member; UM = upper member.

Stratigraphy of the Dalong Formation (Fm.) in the Lower Yangtze region. (A)... Available to Purchase

Published: 01 April 2024
Figure 4. Stratigraphy of the Dalong Formation (Fm.) in the Lower Yangtze region. (A) Northeast-southwest cross sections. (B) Northwest-southeast cross sections. The cross-section transects are shown in Figure 1D . The lithostratigraphic and total organic carbon ( TOC ) data are from Chen et al
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SEM photos of conodonts from the Permian-Triassic interval of the Bianyang section. All specimens are preserved in the Faculty of Earth Sciences, China University of Geosciences, Wuhan, Hubei Province, P.R. China. Scale bar  =  400 µm. A–B) Clarkina sp., A) upper view, B) lateral view, from Bed 3 of Dalong Formation, BYW1003. C–D) Clarkina sp., C) upper view, D) lateral view, from Bed 3, BYW1007. E) Clarkina meishanensis Zhang, Lai, Ding, and Liu, 1995, upper view, from Bed 5 of Dalong Formation, BY70066. F–G) Clarkina deflecta (Wang and Wang, 1981), F) upper view, G) lateral view, from Bed 3, BYW1004. H–I) Clarkina yiniMei, 1998, H) lateral view, I) upper view, from Bed 3, BYW1006. J–K) Clarkina changxingensis (Wang and Wang, 1981), J) lateral view, K) upper view, from Bed 3, BYW1001. L–N, S) Hindeodus typicalis (Sweet, 1970), all lateral views, L) from Bed 6 of Dalong Formation, BYW2068; M) from Bed 4 of Dalong Formation, BYW1017; N) from Bed 4 of Dalong Formation, BYW1042; S) from Bed 4 of Dalong Formation, BYW1025. O–P, Y–Z, DD–EE) Hindeodus changxingensisWang, 1995, O) lateral view, from Bed 4 of Dalong Formation, BYW1024; P) lateral view, from Bed 4 of Dalong Formation, BYW1032; Y) lateral view, from Bed 5 of Dalong Formation, BY70072; Z) lateral view, from Bed 5 of Dalong Formation, BY70067; DD) lateral view, EE) upper view, from Bed 5 of Dalong Formation, BY70071. Q) Hindeodus cf. latidentatus, lateral view, from Bed 4 of Dalong Formation, BYW1026. R, T–V) Hindeodus praeparvus (Kozur, 1996), all lateral views, R) from Bed 4 of Dalong Formation, BYW1045; T) from Bed 6 of Dalong Formation, BYW2054; U) from Bed 4 of Dalong Formation, BYW1022; V) from Bed 4 of Dalong Formation, BYW1028. W–X, FF–GG) Hindeodus inflatus Nicoll, Metcalfe, and Wang, 2002, all are from Bed 6 of Dalong Formation, W) lateral view, X) upper view, BYW2070; FF) lateral view, GG) upper view, BYW2048. AA–BB) Hindeodus eurypyge Nicoll, Metcalfe, and Wang, 2002, AA) lateral view, BB) upper view, from Bed 6, BYW2051. CC) Hindeodus sp., lateral view, from Bed 6 of Dalong Formation, BYW2016.

SEM photos of conodonts from the Permian-Triassic interval of the Bianyang ... Available to Purchase

Published: 01 August 2013
, from Bed 3 of Dalong Formation, BYW1003. C–D) Clarkina sp., C) upper view, D) lateral view, from Bed 3, BYW1007. E) Clarkina meishanensis Zhang, Lai, Ding, and Liu, 1995, upper view, from Bed 5 of Dalong Formation, BY70066. F–G) Clarkina deflecta (Wang and Wang, 1981), F) upper view, G) lateral
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Kerogen types in the Gufeng and Dalong Formations (Fm.) based on the kerogen type index (TI) (A) and kerogen C isotopes (δ13C) (B). Compiled organic C isotope (δ13Corg) data are from Liao et al. (2016a), Kang (2019), Li et al. (2020), and Zhang et al. (2020). I = sapropel type organic matter; II1 = partial sapropel type organic matter; II2 = partial humic type organic matter; III = humic type organic matter.

Kerogen types in the Gufeng and Dalong Formations (Fm.) based on the keroge... Available to Purchase

Published: 01 April 2024
Figure 11. Kerogen types in the Gufeng and Dalong Formations (Fm.) based on the kerogen type index ( TI ) (A) and kerogen C isotopes ( δ 13 C ) (B). Compiled organic C isotope ( δ 13 C org ) data are from Liao et al. (2016a) , Kang (2019) , Li et al. (2020) , and Zhang et al. ( 2020 ). I
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Field photographs (A, B, D, G, and H) and photomicrographs (C, E, F, and I) of the Dalong Formation (Fm.) in the Lower Yangtze region. (A) Overview of the Dalong Formation in the Niushan section in the Xuancheng area. (B) Close-up view of the lower member (LM) of the Dalong Formation. (C) Black siliceous mudstone with few laminae and little biodetritus. (D) Black chert and siliceous mudstone of the middle member (MM) of the Dalong Formation. (E) Radiolarians replaced by quartz in the organic-rich matrix of chert. (F) Siliceous mudstone containing little skeletal debris and undeformed radiolarians. (G) Gray, laminated, calcareous mudstone of the upper member (UM) of the Dalong Formation. (H) Thin-bedded calcareous mudstone, with occasional volcanic ash layers. (I) Thin section of calcareous mudstone showing faint laminae and a fine-grained carbonate matrix. The hammer for scale is 30 cm (12 in.)

Field photographs (A, B, D, G, and H) and photomicrographs (C, E, F, and I)... Available to Purchase

Published: 01 April 2024
Figure 5. Field photographs (A, B, D, G, and H) and photomicrographs (C, E, F, and I) of the Dalong Formation (Fm.) in the Lower Yangtze region. (A) Overview of the Dalong Formation in the Niushan section in the Xuancheng area. (B) Close-up view of the lower member (LM) of the Dalong Formation
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Representatives of Changhsingian and Griesbachian ammo-noids and their typical shell ornamentations. (A,B) Pseudotirolites acuticostatus from the Dalong Formation (Changhsingian), Guizhou, China. (C,D) Pseudogastrioceras szechuanense from the Dalong Formation (Changhsingian), Sichuan, China. (E) Tapashanites floriformis from the Dalong Formation (Changhsingian), Sichuan, China. (F,G) Vishnuites pralambha from the lower Daye Formation (Griesbachian), Guizhou, China. (H,I) Anotoceras nala from the lower Daye Formation (Griesbachian), Guizhou, China. (J,K) Ophiceras tibeticum from the lower Kangshare Formation (Griesbachian), South Tibet, China.

Representatives of Changhsingian and Griesbachian ammo-noids and their typi... Open Access

Published: 03 June 2021
Figure 1. Representatives of Changhsingian and Griesbachian ammo-noids and their typical shell ornamentations. (A,B) Pseudotirolites acuticostatus from the Dalong Formation (Changhsingian), Guizhou, China. (C,D) Pseudogastrioceras szechuanense from the Dalong Formation (Changhsingian
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SEM photos of conodonts from the Permian–Triassic interval of the Bianyang section. All specimens are preserved in the Faculty of Earth Sciences, China University of Geosciences, Wuhan, Hubei Province, P.R. China. Scale bar  =  400 µm. A–D, Q, T, W) Hindeodus praeparvus (Kozur, 1996), all are from Bed 6 of Dalong Formation, A) lateral view, B) upper view, BYW2053; C) lateral view, D) upper view, BYW2021; Q) lateral view, BYY7039; T) lateral view, BYW2040; W) lateral view, BYY2015. E–F) Hindeodus inflatus Nicoll, Metcalfe, and Wang, 2002, E, lateral view, F, upper view, from Bed 6 of Dalong Formation, BYW2003. G–P, S, U) Hindeodus parvus (Kouzr and Pjatakova, 1976), all are from Bed 6 of Dalong Formation, G) lateral view, BYW2001; H) lateral view, I) upper view, BYW2018; J) lateral view, K) upper view, BYW2020; L) lateral view, M) upper view, BYW2035; N) lateral view, O) upper view, BYW2034; P) lateral view, BYY7036; S) lateral view, BYW2023; U) lateral view, BYW2024. R) Isarcicella prisca Kozur, 1995, lateral view, from Bed 6 of Dalong Formation, BYY1088. V) Hindeodus anterodentatus (Dai, Tian, and Zhang, 1989), lateral view, from Bed 6 of Dalong Formation, BYY7042.

SEM photos of conodonts from the Permian–Triassic interval of the Bianyang ... Available to Purchase

Published: 01 August 2013
), all are from Bed 6 of Dalong Formation, A) lateral view, B) upper view, BYW2053; C) lateral view, D) upper view, BYW2021; Q) lateral view, BYY7039; T) lateral view, BYW2040; W) lateral view, BYY2015. E–F) Hindeodus inflatus Nicoll, Metcalfe, and Wang, 2002, E, lateral view, F, upper view, from Bed 6
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Histograms of vitrinite reflectance (Ro) values in sections/cores (A) and single samples (B). Inset in (B) shows boxplots of Ro values for the Gufeng and Dalong Formations (Fm.). (C) The temperature at which hydrocarbon generation rate is maximal during pyrolysis (Tmax) values in single samples. Insets show boxplots of Tmax values for the Gufeng and Dalong Formations, and the correlation between Tmax and Ro values. (D) A plot of the hydrogen index (HI) versus Tmax for the Gufeng and Dalong Formations in the Lower Yangtze region. The solid circles and squares are test data, whereas the hollow circles and squares are recovery data. I = sapropel type organic matter; II1 = partial sapropel type organic matter; II2 = partial humic type organic matter; III = humic type organic matter; R2 = coefficient of determination.

Histograms of vitrinite reflectance ( Ro ) values in sections/cores (A) and... Available to Purchase

Published: 01 April 2024
Figure 9. Histograms of vitrinite reflectance ( Ro ) values in sections/cores (A) and single samples (B). Inset in (B) shows boxplots of Ro values for the Gufeng and Dalong Formations (Fm.). (C) The temperature at which hydrocarbon generation rate is maximal during pyrolysis ( T max ) values
Journal Article

Hydrocarbon source rock characteristics and shale gas potential of Permian marine shales in the Lower Yangtze region of South China Available to Purchase

Bolin Zhang, Suping Yao, Wenxuan Hu, Yuyuan Wu, Wenduan Yu, Hao Yu
Journal: AAPG Bulletin
Published: 01 April 2024
AAPG Bulletin (2024) 108 (4): 719–749.
DOI: https://doi.org/10.1306/12152322141
...Figure 4. Stratigraphy of the Dalong Formation (Fm.) in the Lower Yangtze region. (A) Northeast-southwest cross sections. (B) Northwest-southeast cross sections. The cross-section transects are shown in Figure 1D . The lithostratigraphic and total organic carbon ( TOC ) data are from Chen et al...
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View PDF for article title, Hydrocarbon source rock characteristics and shale gas potential of Permian marine shales in the Lower Yangtze region of South China
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Field photos show the (A–B) Zhongli, (C–D) Ganxi, and (E–F) Jianshi sections. (A) The upper Wujiaping Formation consists of thick bioclastic limestone, while the lowermost part of the Luolou Formation is lamellar microbialite. See the geological hammer (~27 cm) in the white ellipse for scale. (B) Thrombolite in the lower Luolou Formation. See the geomagnetic sampling hole (25.4 mm in diameter) for scale. (C) Lithological changes through the P-Tr boundary. (D) Close view of the thinly bedded siliceous carbonate in the Dalong Formation. (E) Panoramic view of the lower Dalong Formation shows thinly bedded siliceous carbonate. (F) Lithological changes through the P-Tr boundary. Fm—formation, PTB—P-Tr boundary, PTE—P-Tr extinction.

Field photos show the (A–B) Zhongli, (C–D) Ganxi, and (E–F) Jianshi section... Available to Purchase

Published: 17 September 2021
for scale. (B) Thrombolite in the lower Luolou Formation. See the geomagnetic sampling hole (25.4 mm in diameter) for scale. (C) Lithological changes through the P-Tr boundary. (D) Close view of the thinly bedded siliceous carbonate in the Dalong Formation. (E) Panoramic view of the lower Dalong Formation
Journal Article

Latest Permian Entactinaria (Radiolaria) from southern Guangxi, China Available to Purchase

QINGLAI FENG, SONGZHU GU, WEIHONG HE, YUXI JIN
Published: 01 April 2007
Journal of Micropalaeontology (2007) 26 (1): 19–37.
DOI: https://doi.org/10.1144/jm.26.1.19
...QINGLAI FENG; SONGZHU GU; WEIHONG HE; YUXI JIN Abstract A highly diverse and well-preserved latest Permian radiolarian fauna was obtained from muddy siliceous rocks and siliceous mudstones of the Dalong Formation, southern Guangxi, China. Specimens of the Order Entactinaria were selected...
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View PDF for article title, Latest Permian Entactinaria (Radiolaria) from southern Guangxi, China
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Journal Article

Paleozoic shale gas resources in the Sichuan Basin, China Available to Purchase

Christopher J. Potter
Journal: AAPG Bulletin
Published: 01 June 2018
AAPG Bulletin (2018) 102 (6): 987–1009.
DOI: https://doi.org/10.1306/0828171607817072
... Permian Longtan and Dalong Formations. This study defined geologically based assessment units and calculated probabilistic distributions of technically recoverable shale gas resources using the USGS well productivity–based method. For six assessment units evaluated in 2015, the USGS estimated a mean value...
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View PDF for article title, Paleozoic shale gas resources in the Sichuan Basin, China
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Journal Article

Petroleum-generation timing and source in the northern Longmen Shan thrust belt, Southwest China: Implications for multiple oil-generation episodes and sources Available to Purchase

Xiang Ge, Chuanbo Shen, David Selby, Jie Wang, Liangbang Ma, Xiaoyan Ruan, Shouzhi Hu, Lianfu Mei
Journal: AAPG Bulletin
Published: 01 May 2018
AAPG Bulletin (2018) 102 (5): 913–938.
DOI: https://doi.org/10.1306/0711171623017125
... and Qiongzhusi Formations. In contrast, the organic geochemistry of the present-day oil seeps are distinct from that of the bitumen, and suggest that the source is the Permian Dalong Formation. Bitumen Re-Os data indicate that the upper Neoproterozoic–lower Cambrian Doushantuo and Qiongzhusi Formations underwent...
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View PDF for article title, Petroleum-generation timing and source in the northern Longmen Shan thrust belt, Southwest China: Implications for multiple oil-generation episodes and sources
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Journal Article

Coal in a carbonate sequence stratigraphic framework: the Upper Permian Heshan Formation in central Guangxi, southern China Available to Purchase

Longyi Shao, Pengfei Zhang, R.A. Gayer, Jialiang Chen, Shifeng Dai
Published: 01 March 2003
Journal of the Geological Society (2003) 160 (2): 285–298.
DOI: https://doi.org/10.1144/0016-764901-108
...-volatile bituminous coals with very high organic sulphur overlie either palaeosols or locally developed cherts. The petrography and geochemistry of the coals suggest formation in low-lying mires, in which marine influence increased upwards. In the Heshan and overlying Dalong Formations, four third-order...
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View PDF for article title, Coal in a carbonate sequence stratigraphic framework: the Upper Permian Heshan <span class="search-highlight">Formation</span> in central Guangxi, southern China
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Journal Article

Some New Radiolarian Species and Genus from Upper Permian in Guangxi Province, South China Available to Purchase

Jun Wu, Qinglai Feng, Biwen Gui, Guichun Liu
Published: 01 September 2010
Journal of Paleontology (2010) 84 (5): 879–894.
DOI: https://doi.org/10.1666/09-057.1
...Jun Wu; Qinglai Feng; Biwen Gui; Guichun Liu Abstract A well-preserved highly diverse radiolarian fauna was discovered from the Upper Permian Dalong Formation in Guangxi, South China. A new genus and 19 species are described in this paper. Zhuangodiscus n. gen. belongs to the Family Relindellidae...
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View PDF for article title, Some New Radiolarian Species and Genus from Upper Permian in Guangxi Province, South China
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Inversion results and speculated anomalies. (a) Line a; (b) line b; (c) line c; and (d) line d. 1—Daye Formation; 2—Dalong Formation; 3—Longtan formation Upper section; 4—Longtan Formation Lower section; 5—stratigraphic boundary; 6—coal seam; 7—air-filled goaf; and 8—water-filled goaf.

Inversion results and speculated anomalies. (a) Line a; (b) line b; (c) lin... Open Access

Published: 06 February 2025
Figure 7 Inversion results and speculated anomalies. (a) Line a; (b) line b; (c) line c; and (d) line d. 1—Daye Formation; 2—Dalong Formation; 3—Longtan formation Upper section; 4—Longtan Formation Lower section; 5—stratigraphic boundary; 6—coal seam; 7—air-filled goaf; and 8—water-filled goaf.
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Contour maps showing the thicknesses (A, B), total organic carbon (TOC) contents (C, D), and vitrinite reflectance (Ro) values (E, F) of organic-rich shales of the Gufeng and Dalong Formations (Fm.) in the Lower Yangtze region, respectively.

Contour maps showing the thicknesses (A, B), total organic carbon ( TOC ) c... Available to Purchase

Published: 01 April 2024
Figure 6. Contour maps showing the thicknesses (A, B), total organic carbon ( TOC ) contents (C, D), and vitrinite reflectance ( Ro ) values (E, F) of organic-rich shales of the Gufeng and Dalong Formations (Fm.) in the Lower Yangtze region, respectively.
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Late Permian–Early Triassic sedimentation rates and (inset) paleogeography for Meishan and Chaohu, eastern China. Note sedimentation rate peak during Griesbachian to Smithian substages. Abbreviations: M—Mundil et al. (2004); G—Galfetti et al. (2007); O—Ovtcharova et al. (2006); L—Lehrmann et al. (2006); Ch—Changhsing(ian), D—Dienerian, Gr—Griesbachian, Sm—Smithian, W—Wuchiapingian, Dg—Dalong Formation, H—Helongshan Formation, Lt—Longtan Formation, Y—Yinkeng Formation.

Late Permian–Early Triassic sedimentation rates and (inset) paleogeography ... Available to Purchase

Published: 01 November 2010
— Lehrmann et al. (2006) ; Ch—Changhsing(ian), D—Dienerian, Gr—Griesbachian, Sm—Smithian, W—Wuchiapingian, Dg—Dalong Formation, H—Helongshan Formation, Lt—Longtan Formation, Y—Yinkeng Formation.
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Box-and-whisker plots of the main mineral compositions in the Gufeng (A) and Dalong (B) Formations (Fm.), and mineralogically based ternary diagrams for the Gufeng (C) and Dalong (D) Formations. The boxes in (A) and (B) indicate the 25th and 75th percentiles, with the median values represented by the red lines. The yellow squares in the boxes in (A) and (B) indicate the mean values. The red lines in (C) and (D) indicate the dominant lithofacies in the Gufeng and Dalong Formations. The base map was modified from Wu et al. (2016) and Gale et al. (2017). Data are from Chen et al. (2013), Pan et al. (2013), Cao et al. (2016), Pan (2016), Yuan (2018), Chen (2020), Xu et al. (2019, 2020), and Zhao et al. (2021). C = calcareous shale lithofacies; C-1 = silica–rich calcareous shale lithofacies; C-2 = mixed calcareous shale lithofacies; C-3 = clay–rich calcareous shale lighofacies; CM = argillaceous shale lithofacies; CM-1 = silica–rich argillaceous shale lithofacies; CM-2 = mixed argillaceous shale lithofacies; CM-3 = carbonate–rich argillaceous shale lithofacies; M = mixed shale lithofacies; M-1 = mixed calcareous–siliceous shale lithofacies; M-2 = mixed argillaceous–siliceous shale lithofacies; M-3 = mixed argillaceous–calcareous shale lithofacies; S = siliceous shale lithofacies; S-1 = carbonate–rich siliceous shale lithofacies; S-2 = mixed siliceous shale lithofacies; S-3 = clay–rich siliceous shale lithofacies.

Box-and-whisker plots of the main mineral compositions in the Gufeng (A) an... Available to Purchase

Published: 01 April 2024
Figure 7. Box-and-whisker plots of the main mineral compositions in the Gufeng (A) and Dalong (B) Formations (Fm.), and mineralogically based ternary diagrams for the Gufeng (C) and Dalong (D) Formations. The boxes in (A) and (B) indicate the 25th and 75th percentiles, with the median values
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Histograms of total organic carbon (TOC) contents in sections/cores (A) and single samples (B) of the Gufeng and Dalong Formations (Fm.) in the Lower Yangtze region. Data are from Chen et al. (2013), Pan et al. (2013), Gu (2014), Cao et al. (2016), Liao et al. (2016a, b), Pan (2016), Han et al. (2017), Yuan (2018), Zhang et al. (2018, 2020), Kang (2019), Xu et al. (2019, 2020), Chen (2020), and Zhao et al. (2021).

Histograms of total organic carbon ( TOC ) contents in sections/cores (A) a... Available to Purchase

Published: 01 April 2024
Figure 8. Histograms of total organic carbon ( TOC ) contents in sections/cores (A) and single samples (B) of the Gufeng and Dalong Formations (Fm.) in the Lower Yangtze region. Data are from Chen et al. (2013) , Pan et al. (2013) , Gu (2014) , Cao et al. (2016) , Liao et al. (2016a , b
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Regional stratigraphic columns of Permian to Triassic successions in the South China block with positions of sandstone samples. Positions of the columns are shown in Figure 1. Stratigraphic units: D3l—Liujiang Formation; P1q—Qixia Formation; P1m—Maokou Formation; P1w—Wenbishan Formation; P2a, P2b, P2c, P2d—four formations of Late Permian in ascending order; P2l—Longtan Formation; P2d—Dalong Formation; T1—Early Triassic Formation; T3p—Pingtong Formation; T3f—Feixianguan Formation; T3xp—Xiaoping Formation; J1—Early Jurassic Formation; J1w—Wangmen Formation; J1jn—Jinji Formation.

Regional stratigraphic columns of Permian to Triassic successions in the So... Available to Purchase

Published: 28 February 2019
Formation; P 2 a , P 2 b , P 2 c , P 2 d —four formations of Late Permian in ascending order; P 2 l—Longtan Formation; P 2 d—Dalong Formation; T 1 —Early Triassic Formation; T 3 p—Pingtong Formation; T 3 f—Feixianguan Formation; T 3 xp—Xiaoping Formation; J 1 —Early Jurassic Formation; J 1 w—Wangmen