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![Figure 3. C isotope chemostratigraphy correlation of Laolin section in southwest China with sections in southwest Mongolia (Brasier et al., 1996) and in northern Siberia (Kaufman et al., 1996). Detailed description of Mongolian section and section in northern Siberia can be found in Brasier et al. (1996) and Kaufman et al. (1996), respectively. TO Fm—Tsagaan Oloom Formation; BG Fm—Bayan Gol Formation; SG Fm—Salaany Gol Formation; SR Fm—Staraya Rechka Formation; MA Fm—Manykai Formation; M Fm—Medvezhya Formation; KYD—Kyndyn Dolostone. Other abbreviations as in Figure 1.]()
![Age model output for global small skeletal fossil (SSF) biostratigraphy (updated from Bowyer et al., 2022). (A) 1—Ediacaran-Cambrian boundary ca. 538.8 Ma (International Chronostratigraphic Chart, 2022, of Cohen et al., 2013, updated) after maximum age for the first appearance datum (FAD) of Treptichnus pedum based on lithostratigraphic correlation to section hosting radiometric age (Namibia; see discussions in Bowyer et al., 2022; Nelson et al., 2022; and herein); 2—nadir of 1n/basal Cambrian δ13Ccarb excursion (BACE) after model C of Bowyer et al. (2022); 3—chemostratigraphically constrained maximum age for the FAD of T. pedum in the Esmeralda Member of the Deep Spring Formation, Mount Dunfee section, Nevada, USA (Laurentia; Smith et al., 2016b). SPIE—Spitskop δ13Ccarb excursion, Namibia; N—Nemakit; Atdab—Atdabanian. (B–C) Best-fit visual alignment of δ13Ccarb data calibrates associated biostratigraphy after (B) model E and (C) model F. All δ13Ccarb models include radiometrically calibrated and best-fit global data, color coded by region and updated with new data from the Kalahari craton, South Africa (Nelson et al., 2022), the Zavkhan terrane, Mongolia (Topper et al., 2022), and the southeast Siberian Platform (herein). KY—Kyra-Ytyga River mouth section. The Zhujiaqing carbon isotope excursion (ZHUCE) in the Dahai Member of South China is assumed to correlate with 6p in this model. Dashed vertical lines indicate uncertain range extensions. Single fragment of ?Barskovia sp. in the lower Platonovka Formation at Sukhaya Tunguska section may represent the earliest occurrence of stem group mollusks (Marusin et al., 2019). Historical biostratigraphic information from the Zuun-Arts and Bayan Gol formations of the Zavkhan terrane, Mongolia (as presented in Bowyer et al., 2022), is replaced herein by the chemostratigraphically calibrated biostratigraphy of Topper et al. (2022). Fossil occurrences in the phosphatic Zhongyicun Member of South China are not considered. (D) Temporal range of cloudinids according to models E and F, including (1) cloudinids recorded in the middle Ust’-Yudoma Formation at Kyra-Ytyga, and (2) chemostratigraphically well-constrained Zuunia chimidtsereni in the Zuun-Arts and lower Bayan Gol formations (Topper et al., 2022). Full age model spreadsheet is available upon request.]()
![Carbon isotope chemostratigraphy and lithostratigraphy of Tsagaan Oloom Formation (sections F704, F708, and F709) compared to composite δ13C curve of Otavi Group in Namibia. Isotopic data from the Ediacaran Tsumeb Subgroup and from shelf sections of Cryogenian Abeneb Subgroup are from Halverson et al. (2005). Abeneb slope data are courtesy of Paul Hoffman. For the Tsumeb, the ~1400 m shelf data have been stretched to fit the ~475 m slope data, and for the Abeneb, ~500-m-thick shelf sections have been stretched to fit the lower 150 m of the ~300-m-thick slope sections. This correlation rests on interpretation that Trezona anomaly has been removed by glacial erosion from shelf sections in Mongolia. DV—Dzabkhan volcanics; MU—Maikhan Ul member; K—Khongoryn member: Ol—Ol member; BG—Bayan Gol Formation.]()
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![A: Tectonic map of western Mongolia modified from Badarch et al. (2002) and Windley et al. (2007). Teeth on faults indicate the inferred dip of subduction zones. K-D Arc— Khantayshir-Dariv Arc; AZ—accretionary zone including arcs, metamorphic rocks, and ophiolites; NP—Neoproterozic; Ord—Ordovician; Carb—Carboniferous; U.B.—Ulaan Bulagyn. Red box outlines position of B. B: Geological map of Tayshir region. Blue map units include entire Tsagaan Oloom Formation with exception of Zunne Arts (Z.A.) member. Green map unit includes Zunne Arts member of Tsagaan Oloom Formation, and Bayan Gol (B.G.) and Salaany Gol (S.G) Formations.]()
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![Correlation of major events of the Late Precambrian in the north of the Central Asian Fold Belt. 1 – structural unconformities; 2 – assumed structural unconformities; 3 – disconformities; 4 – sedimentation gaps; 5 – metamorphism; 6 – rifting; 7 – island arcs; 8 – granitoids; 9 – ophiolites; 10 – basic volcanites; 11 – acidic and medium volcanites; 12 – tuffs and tuff-sandstones; 13 – tillites; 14 – conglomerates; 15 – sandstones; 16 – shales and silty shales; 17 – limestones; 18 – dolomites; 19 – isotope datings; 20 – formations: bn – Bayan-Gol, šr – Shurmak, kn – Kanyon, il – I1igir, dg – Dogaldyn, an – Anangra, vc – Vacha, ank – Aunakit, im – Imnyakh, chm – Khomolkho, ug – Ugakhan, bz – Buzhuikhta, bd – Bodaibokan, bg – Bugorikhta, hv – Khaiverga, hr – Khorlukhtakh.]()
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![Tentative paleogeographic reconstruction for ca. 525 Ma (following Hoffman, 1991; Cawood and Pisarevsky, 2006; McCausland et al., 2007). Cratons are labeled: LAUR—Laurentia, AM—Amazonia, WA—West Africa, BALT—Baltica, SIB—Siberia, MONG—Mongolia, and SC—South China. West Gondwana is positioned such that the paleomagnetic pole from the 525 ± 5 Ma Itabaiana dikes (IB) of Amazonia (Trindade et al., 2006) is near the South Pole. Laurentia is positioned so that the paleomagnetic pole from the Mont Rigaud and Chatham-Grenville (MR) syenitic intrusions (McCausland et al., 2007) is near the South Pole. Siberia is located so that the 533–523 Ma paleomagnetic poles from the Kessyusa sandstone (KS) and Erkeket limestone (EK) from the Khorbusuonka section (Ko; Fig. 4B) are near the South Pole. Baltica is positioned so that the paleomagnetic pole from the 540–520 Ma Torneträsk Formation siltstone is near the South Pole. Mongolia and South China have no Lower Cambrian paleomagnetic constraints. Paleomagnetic poles (Table A1) and rotations (Table A2) can be found in Appendix section A8. Lower Cambrian stratigraphic sections are labeled: Morocco: ZB—Zawyat n’ Bougzoul, OS—Oued Sdas, TY—Talat n’ Yissi, SM—Sidi M'Sal; Siberia: Se—Selinde, Al—Aldan (Dvortsy and Ulakhan Sulugur), Le—Lena (Isit’ and Zhurinsky Mys), Kh—Khorbusuonka, Bo—Bol'shaya Kuonamka, Ko—Kotuikan, Su—Sukharikha; Mongolia: Ts,Sa—Tsagaan Gol and Salaany Gol, Ba—Bayan Gol, KT—Kvete-Tsakhir-Nuruu; and South China: Me—Meishucun, Xi—Xiaotan, An—Anjiahe, Ji—Jijiapo. This plate reconstruction is fraught with uncertainties and assumptions and only should be considered as a very general guide to the relative location of continents during the Early Cambrian (see Appendix section A8 for details).]()
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![Schematic structure of the Mazhalyk intrusion. 1 — rocks of layered series, 2 — rocks of basal peridotite layer, 3 — dips and strikes of layering, 4 — marginal facies, 5 — own dikes of intrusion, 6 — hornfelsed schists and metavolcanites, 7 — granitoids of Bren’ complex, 8 — Quaternary rocks, 9 — sampling locality at profile I-51-99 for Ar-Ar dating, 10 — directions of sections A–B, C–D, E–F; 11 — absolute heights, in meters. Inset: Schematic location of intrusions of peridotite-pyroxenite-gabbronorite formation in structures of Eastern Tuva and Northwestern Mongolia [7]. 1 — structures of Precambrian basement, 2 — volcanogenic complexes of dacite-andesite-basalt series with subordinate carbonate and terrigene-schist rocks, 3 — carbonate-terrigene rocks with subordinate volcanogenic complexes, 4 — Late Caledonian volcanogenic-silica-schist units of Cambrian and flyschoid rocks of Cambrian-Ordovician; volcano-sedimentary complexes: 5 — Early Hercynian, 6 — Hercynian, 7 — Meso-Cenozoic; 8 — faults; 9 — intrusions of peridotite-pyroxenite-gabbronorite suite; intrusions of Mazhalyk Complex of East Tuva: 1 — Mazhalyk, 2 — Karashat, 3 — Kalbakdag, 4 — Brungan, 5 — Khanga, 6 — Bash-Khem, 7 — Elig-Khol’, 8 — Khanchar, 9 — Pogranichny; intrusions of Hyargas Complex of Lake zone, Northeastern Mongolia: 10 — Zamyn, 11 — Centre, 12 — Ulan-Ula, 13 — Kharachulu, 14 — Tas-Khairkhan, 15 — Sar-Khairkhan, 16 — Dzabkhan, 17 — Bayan-Tsagan, 18 — Khairkhan, 19 — Tugurik, 20 — Sukhotin-Hara-Ula; intrusions of Tamir Complex of Hangayn mountain region of Northeastern Mongolia: 21 — Ortsog-Ula, 22 — Dulan-Ula, 23 — Hara-Tologoi, 24 — Hargatuin-Gol, 25 — Bayan-Bulak, 26 — Olon-Huduk, 27 — Bumbeger.]()
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1-20 OF 78 RESULTS FOR
Bayan Gol Formation
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Journal Article
PUNCTUATED GROWTH OF MICROBIAL CONES WITHIN EARLY CAMBRIAN ONCOIDS, BAYAN GOL FORMATION, WESTERN MONGOLIA Available to Purchase
Journal: PALAIOS
Publisher: SEPM Society for Sedimentary Geology
Published: 01 December 2015
PALAIOS (2015) 30 (12): 836–845.
... microbialites are useful biosignatures when filaments are no longer preserved, but have typically been observed within stromatolites. This study describes bubble-associated fenestrae within oncoids from the early Cambrian Bayan Gol Formation of Mongolia. Fenestrae appear in mm-scale micritic laminae which...
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Journal Article
Palaeomagnetism of the Bayan Gol Formation, western Mongolia Free
Journal: Geological Magazine
Publisher: Cambridge University Press
Published: 01 July 1996
Geological Magazine (1996) 133 (4): 487–496.
Image
Figure 3. C isotope chemostratigraphy correlation of Laolin section in sout... Available to Purchase
in New C isotope stratigraphy from southwest China: Implications for the placement of the Precambrian-Cambrian boundary on the Yangtze Platform and global correlations
> Geology
Published: 01 July 2000
al. (1996) and Kaufman et al. (1996) , respectively. TO Fm—Tsagaan Oloom Formation; BG Fm—Bayan Gol Formation; SG Fm—Salaany Gol Formation; SR Fm—Staraya Rechka Formation; MA Fm—Manykai Formation; M Fm—Medvezhya Formation; KYD—Kyndyn Dolostone. Other abbreviations as in Figure 1 .
Journal Article
Integrated stratigraphic, geochemical, and paleontological late Ediacaran to early Cambrian records from southwestern Mongolia: Comment Open Access
Journal: GSA Bulletin
Publisher: Geological Society of America
Published: 01 July 2017
GSA Bulletin (2017) 129 (7-8): 1012–1015.
... succession of the Zavkhan terrane includes the siliciclastic-dominated, upper Lower Cambrian, foredeep Khayrkhan Formation (ca. >200 m to 500 m thick), which unconformably overlies or is in thrust contact with units as low as the Bayan Gol Formation ( Brasier et al., 1996b , p. 455; Smith et al., 2016...
Image
Age model output for global small skeletal fossil (SSF) biostratigraphy (up... Available to Purchase
in Implications of an integrated late Ediacaran to early Cambrian stratigraphy of the Siberian Platform, Russia
> GSA Bulletin
Published: 11 January 2023
. Single fragment of ? Barskovia sp. in the lower Platonovka Formation at Sukhaya Tunguska section may represent the earliest occurrence of stem group mollusks ( Marusin et al., 2019 ). Historical biostratigraphic information from the Zuun-Arts and Bayan Gol formations of the Zavkhan terrane, Mongolia
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Carbon isotope chemostratigraphy and lithostratigraphy of Tsagaan Oloom For... Available to Purchase
in Stratigraphic and tectonic implications of a newly discovered glacial diamictite–cap carbonate couplet in southwestern Mongolia
> Geology
Published: 01 February 2009
rests on interpretation that Trezona anomaly has been removed by glacial erosion from shelf sections in Mongolia. DV—Dzabkhan volcanics; MU—Maikhan Ul member; K—Khongoryn member: Ol—Ol member; BG—Bayan Gol Formation.
Journal Article
Diachronous Increase in Early Cambrian Ichnofossil Size and Benthic Faunal Activity in Different Climatic Regions Available to Purchase
Journal: Journal of Paleontology
Publisher: Paleontological Society
Published: 01 March 2014
Journal of Paleontology (2014) 88 (2): 331–338.
... bioturbation indices (BPBI) ( Miller and Smail, 1997 ), from three different early Cambrian formations; the Chapel Island Formation, Newfoundland; the Zhujiaqing Formation, Yunnan, South China; and the Bayan Gol Formation, Gobi-Altai, western Mongolia. These patterns of stratigraphic change expressed...
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Journal Article
Correlation of the Cambrian Evolutionary Radiation: geochronology, evolutionary stasis of earliest Cambrian (Terreneuvian) small shelly fossil (SSF) taxa, and chronostratigraphic significance Available to Purchase
Journal: Geological Magazine
Publisher: Cambridge University Press
Published: 01 February 2016
Geological Magazine (2016) 153 (4): 750–756.
....
1 ). Finally, the Bayan Gol Formation and Heraultia Limestone faunas with W.
crosbyi are best regarded as pre-Tommotian. The Bayan Gol's δ 13 C
succession suggests correlation of its F excursion or, pending further study, its D and E
excursions, with L4 and I’ (Brasier...
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A: Tectonic map of western Mongolia modified from Badarch et al. (2002) a... Available to Purchase
in Stratigraphic and tectonic implications of a newly discovered glacial diamictite–cap carbonate couplet in southwestern Mongolia
> Geology
Published: 01 February 2009
; Ord—Ordovician; Carb—Carboniferous; U.B.—Ulaan Bulagyn. Red box outlines position of B. B: Geological map of Tayshir region. Blue map units include entire Tsagaan Oloom Formation with exception of Zunne Arts (Z.A.) member. Green map unit includes Zunne Arts member of Tsagaan Oloom Formation, and Bayan
Journal Article
Stratigraphic and tectonic implications of a newly discovered glacial diamictite–cap carbonate couplet in southwestern Mongolia Available to Purchase
Journal: Geology
Publisher: Geological Society of America
Published: 01 February 2009
Geology (2009) 37 (2): 123–126.
... rests on interpretation that Trezona anomaly has been removed by glacial erosion from shelf sections in Mongolia. DV—Dzabkhan volcanics; MU—Maikhan Ul member; K—Khongoryn member: Ol—Ol member; BG—Bayan Gol Formation. ...
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Journal Article
Nd isotope composition of early Cambrian discrete basins Available to Purchase
Journal: Geological Magazine
Publisher: Cambridge University Press
Published: 01 March 2002
Geological Magazine (2002) 139 (2): 159–169.
... came from the Bayan Gol Formation which is up to 1300 m thick and comprises alternations of limestone and argillite, silt-stone and sandstone (Khomentovky & Gibsher, 1996). High radiogenic Nd with ε Nd (t) values close to −3.0 is recorded in Small Shelly Fossils covering a 3–5 m.y. time span...
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Correlation of major events of the Late Precambrian in the north of the Cen... Available to Purchase
in THE EVENT NATURE OF THE NEOPROTEROZOIC STRATIGRAPHIC SCALE FOR SIBERIA AND CHINA
> Russian Geology and Geophysics
Published: 01 August 1996
– granitoids; 9 – ophiolites; 10 – basic volcanites; 11 – acidic and medium volcanites; 12 – tuffs and tuff-sandstones; 13 – tillites; 14 – conglomerates; 15 – sandstones; 16 – shales and silty shales; 17 – limestones; 18 – dolomites; 19 – isotope datings; 20 – formations: bn – Bayan
Journal Article
Vendian Island-Arc Intrusive Magmatism of the Lake Zone of Western Mongolia (Geological, Geochronological, and Petrochemical Data) Available to Purchase
Journal: Russian Geology and Geophysics
Publisher: Novosibirsk State University
Published: 01 June 2021
Russ. Geol. Geophys. (2021) 62 (6): 619–632.
...., 2008 ). The third belt (sedimentary cover) is composed of carbonate and terrigenous marginal sea deposits of the late Riphean–early Cambrian age. The fourth belt is represented by volcano-plutonic and sedimentary formations of the oceanic crust (Bayan-Khongor ophiolites) of Western Mongolia...
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Includes: Supplemental Content
Journal Article
Dzhida island-arc system in the Paleoasian Ocean: structure and main stages of Vendian-Paleozoic geodynamic evolution Available to Purchase
Journal: Russian Geology and Geophysics
Publisher: Novosibirsk State University
Published: 01 January 2007
Russ. Geol. Geophys. (2007) 48 (1): 91–106.
... section. All large intrusions in the Russian Dzhida zone involve layered cumulates. The complex may represent oceanic crust at base of a volcanic arc. Its fragments with restites were described as part of the Bayan-Gol accretionary prism in the Egiyn Gol basin ( Figs. 1 , 4 ; Table 1 ) (see below...
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Tentative paleogeographic reconstruction for ca. 525 Ma (following Hoffman... Available to Purchase
Published: 01 November 2010
—Talat n’ Yissi, SM—Sidi M'Sal; Siberia: Se—Selinde, Al—Aldan (Dvortsy and Ulakhan Sulugur), Le—Lena (Isit’ and Zhurinsky Mys), Kh—Khorbusuonka, Bo—Bol'shaya Kuonamka, Ko—Kotuikan, Su—Sukharikha; Mongolia: Ts,Sa—Tsagaan Gol and Salaany Gol, Ba—Bayan Gol, KT—Kvete-Tsakhir-Nuruu; and South China: Me
Journal Article
Structural and lithological characteristics of the Bayankhongor Ophiolite Zone, Central Mongolia Available to Purchase
Journal: Journal of the Geological Society
Publisher: Geological Society of London
Published: 01 May 2001
Journal of the Geological Society (2001) 158 (3): 445–460.
... mica from a locality on the east side of the Baidrag Gol (N46°45.93′, E99°26.98′) close to the contact between the Dzag zone and the Haluut Bulag mélange and produced a second date of 447.4±9.0 Ma from a second sample of Dzag schists near Bayan Obo village (N46°19.88′, E100°14.50′). They interpreted...
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Journal Article
Integrated stratigraphic, geochemical, and paleontological late Ediacaran to early Cambrian records from southwestern Mongolia: Reply Open Access
Journal: GSA Bulletin
Publisher: Geological Society of America
Published: 01 July 2017
GSA Bulletin (2017) 129 (7-8): 1016–1018.
... , Palaeomagnetism of the Bayan Gol formation, western Mongolia : Geological Magazine , v. 133 , p. 487 – 496 . Harper , D.A. , Rasmussen , C.M. , Liljeroth , M. , Blodgett , R.B. , Candela , Y. , Jin , J. , Percival , I.G. , Rong , J.Y. , Villas , E. , and Zhan , R.B...
Journal Article
Paleomagnetism of Late Paleozoic, Mesozoic, and Cenozoic rocks in Mongolia Available to Purchase
Journal: Russian Geology and Geophysics
Publisher: Novosibirsk State University
Published: 01 April 2010
Russ. Geol. Geophys. (2010) 51 (4): 387–403.
... to present . J. Geophys. Res. 97 ( B10 ), 13,953 – 13,989 .
Evans , D.A. , Zhuravlev , A.Y. , Budney , B.J. , Kirscvink , J.L. , 1996 . Paleomagnetism of the Bayan Gol formation, western Mongolia . Geol. Mag. 133 ( 4 ), 487 – 496...
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![Schematic structure of the Mazhalyk intrusion. 1 — rocks of layered series, 2 — rocks of basal peridotite layer, 3 — dips and strikes of layering, 4 — marginal facies, 5 — own dikes of intrusion, 6 — hornfelsed schists and metavolcanites, 7 — granitoids of Bren’ complex, 8 — Quaternary rocks, 9 — sampling locality at profile I-51-99 for Ar-Ar dating, 10 — directions of sections A–B, C–D, E–F; 11 — absolute heights, in meters. Inset: Schematic location of intrusions of peridotite-pyroxenite-gabbronorite formation in structures of Eastern Tuva and Northwestern Mongolia [7]. 1 — structures of Precambrian basement, 2 — volcanogenic complexes of dacite-andesite-basalt series with subordinate carbonate and terrigene-schist rocks, 3 — carbonate-terrigene rocks with subordinate volcanogenic complexes, 4 — Late Caledonian volcanogenic-silica-schist units of Cambrian and flyschoid rocks of Cambrian-Ordovician; volcano-sedimentary complexes: 5 — Early Hercynian, 6 — Hercynian, 7 — Meso-Cenozoic; 8 — faults; 9 — intrusions of peridotite-pyroxenite-gabbronorite suite; intrusions of Mazhalyk Complex of East Tuva: 1 — Mazhalyk, 2 — Karashat, 3 — Kalbakdag, 4 — Brungan, 5 — Khanga, 6 — Bash-Khem, 7 — Elig-Khol’, 8 — Khanchar, 9 — Pogranichny; intrusions of Hyargas Complex of Lake zone, Northeastern Mongolia: 10 — Zamyn, 11 — Centre, 12 — Ulan-Ula, 13 — Kharachulu, 14 — Tas-Khairkhan, 15 — Sar-Khairkhan, 16 — Dzabkhan, 17 — Bayan-Tsagan, 18 — Khairkhan, 19 — Tugurik, 20 — Sukhotin-Hara-Ula; intrusions of Tamir Complex of Hangayn mountain region of Northeastern Mongolia: 21 — Ortsog-Ula, 22 — Dulan-Ula, 23 — Hara-Tologoi, 24 — Hargatuin-Gol, 25 — Bayan-Bulak, 26 — Olon-Huduk, 27 — Bumbeger.](https://gsw.silverchair-cdn.com/gsw/Content_public/Journal/rgg/45/9/rgg-451074/2/s_s02sep04_page_3_1.jpeg?Expires=2147483647&Signature=op5IfdOjXQzYd8rIhjBoyg2x6JNTcQNseinTSTCG1va8GePMskfbdpsDkKgAELBzLaOA6Z8SJGbEfY9ZEHVGnRoXx8m0oLcF68jjkgbEU8RbqmHhIOJwYmdB-3LasRONDyhetu5jDgGRRhYdEkEeA1YWF0HKq4RmRW9wWc0JLsf9HEsB2CIjX1WaE94tlWd1mTp5-w-77k2XTKDRsJ2ciFpGEFjCpHSV4nLMYQEazqvz7uLVrPtfGjA75iNIJB3xPPi1fvDHEo1n1q0A-dyeHoi6vDxYLqOYV~-wcymlEphGHpmqy-3Cm~Bo9Heg4tgPnXtfi~5jUp1Pu68VUES7PA__&Key-Pair-Id=APKAIE5G5CRDK6RD3PGA)
Schematic structure of the Mazhalyk intrusion. 1 — rocks of layered serie... Available to Purchase
in PETROLOGY OF ORDOVICIAN COLLISION-RELATED LAYERED PERIDOTITE-GABBRO INTRUSIONS ( exemplified by the Mazhalyk intrusion, Southeastern Tuva )
> Russian Geology and Geophysics
Published: 01 September 2004
— Sukhotin-Hara-Ula; intrusions of Tamir Complex of Hangayn mountain region of Northeastern Mongolia: 21 — Ortsog-Ula, 22 — Dulan-Ula, 23 — Hara-Tologoi, 24 — Hargatuin-Gol, 25 — Bayan-Bulak, 26 — Olon-Huduk, 27 — Bumbeger.
Journal Article
Age and biostratigraphy of Early Cambrian tuffs from SE Australia and southern China Available to Purchase
Journal: Journal of the Geological Society
Publisher: Geological Society of London
Published: 01 December 2002
Journal of the Geological Society (2002) 159 (6): 645–658.
... & Jensen (1996) in Mongolia towards the middle of unit 20 in the Bayan Gol Formation, including R . cf. avalonensis and Treptichnus pedum (Seilacher), refers to part of the later Nemakit–Daldynian that appreciably predates the stratotypic Tommotian. On the Olenek Uplift the same levels possibly fall...
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