Association of macro- and microfossils in the Vendian (Ediacaran) postglacial successions in Western Mongolia

Ragozina, A. L.; Dorjnamjaa, D.; Serezhnikova, E. A.; Zaitseva, L. V.; Enkhbaatar, B.

doi:10.1134/s0869593816030059

Cited by 8 publications

(5 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Shuurgat Formation lies below the major Ediacaran unconformity and yields strontium isotopic compositions consistent with early Ediacaran strata elsewhere (Macdonald et al 2009;Macdonald 2011;Macdonald & Jones 2011;Bold et al 2016b). The younger Zuun-Arts Formation, also on the Zavkhan Terrane and correlative with the Khesen Formation, preserves macroscopic algal carbonaceous compressions in shale (Dornbos et al 2016), possible acanthomorphic acritarchs and microscopic multicellular fossils in silicified and phosphatic sediments (Ragozina et al 2007;Ragozina et al 2010;Ragozina et al 2016), and simple bed-planar trace fossils (Goldring & Jensen 1996;Smith et al 2016). The Zuun-Arts Formation has also yielded putative sponge spicules (Brasier et al 1997) although their nature and even biogenicity has been questioned (Zhou et al 1998).…”

Section: Discussionmentioning

confidence: 99%

“…Siphonophycus is also present in early diagenetic cherts of the Shuurgat and Zuun-Arts formations on the nearby Zavkhan Terrane in southwest Mongolia (Ragozina et al 2007;Ragozina et al 2010;Ragozina et al 2016;Anderson et al 2017b). Siphonophycus, particularly as well-developed microbial mats, is much more common in the Shuurgat cherts than in the Khesen phosphorites-it is the most abundant genus in Shuurgat rocks with thousands of reported specimens.…”

Section: Incertae Sedismentioning

confidence: 99%

See 1 more Smart Citation

Palaeobiology of latest Ediacaran phosphorites from the upper Khesen Formation, Khuvsgul Group, northern Mongolia

Anderson

McMahon

Macdonald

et al. 2018

Journal of Systematic Palaeontology

View full text Add to dashboard Cite

Microfossil assemblages that include large acritarchs with complex processes, known as Doushantuo-Pertatataka-type acritarchs, are recovered from early-Ediacaran successions globally. They are commonly found in shale and chert lithologies, but their diversity and palaeobiological significance is greatest when they are phosphatized. The best-known example is from the Doushantuo Formation, South China, which preserves over 60 taxa including possible embryonic forms which may represent the oldest fossil animals. Fossils have only been recorded in four Ediacaran phosphorite deposits. Here we report the fifth such occurrence, from phosphorites of the upper Khesen Formation, Khuvsgul Group, northern Mongolia, where preservation rivals that in the Doushantuo Formation. The assemblage includes the likely cyanobacteria Obruchevella delicata, O. magna, O. parvissima, and O. valdaica, as well as various Siphonophycus filaments, the possible alga Archaeophycus yunnanensis, and the Doushantuo-Pertatataka-type acritarchs Appendisphaera grandis, A. fragilis, A. tenuis, Cavaspina basiconica, Variomargosphaeridium gracile and V. aculeiparvum, sp. nov.. The phosphorites also preserve the multicellular embryo-like taxon Megasphaera, which is represented by M. minuscula sp. nov. and potentially by M. puncticulosa. Geological and chemostratigraphic data suggest a latest Ediacaran age for the Khesen assemblage, immediately prior to the Proterozoic-Phanerozoic boundary. Thus, this is the youngest Doushantuo-Pertatataka-type microfossil assemblage yet described. It extends the range of Appendisphaera, Cavaspina, Megasphaera, and Variomargosphaeridium upward by tens of millions of years. The assemblage adds to a growing database of Ediacaran fossils and emphasizes the importance of Mongolian strata to understanding the transition from a broadly microbial Proterozoic Eon to a Phanerozoic Eon where macroscopic animals acted as geobiological agents. 2 Anderson et al.-Palaeobiology of the upper Khesen Formation

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Incertae Sedismentioning

confidence: 99%

Palaeobiology of latest Ediacaran phosphorites from the upper Khesen Formation, Khuvsgul Group, northern Mongolia

Anderson

McMahon

Macdonald

et al. 2018

Journal of Systematic Palaeontology

View full text Add to dashboard Cite

show abstract

“…Occurrences of Beltanelliformis around the world generally concern sediments deposited in shallow water environment (Narbonne & Hofmann 1987;Fedonkin 1992;Narbonne 1998;Aceñolaza & Alonso 2001;Grazhdankin 2004;Pyle et al 2004;Grazhdankin et al 2005;McIlroy et al 2005;Seilacher et al 2005;Leonov 2007a;Narbonne 2007;Rozhnov 2009;Rozhnov 2010;Liu 2011;Ivantsov et al 2014;Ivantsov 2017;Liu et al 2015b;Netto 2012;Grytsenko 2016;Ragozina et al 2016), sometimes in connection with storm deposits and hummocky cross-stratification (HCS) (Narbonne & Hofmann 1987;Pyle et al 2004;McCall 2006;Narbonne 2007). If the cyanobacterial nature is proved, we can estimate that Beltanelliformis occurences would correspond to the photic zone.…”

Section: Discussionmentioning

confidence: 99%

Beltanelliformis brunsaeMennerinKeller, Menner, Stepanov & Chumakov, 1974: an Ediacaran fossil from Neoproterozoic of Dobrogea (Romania)

Martin¹,

Martin

2018

Geodiversitas

View full text Add to dashboard Cite

Ediacaran fossils are now largely known in different parts of the world. However, some countries are poorly documented on these remains. Thus, rare fossils from the Neoproterozoic Histria Formation of central Dobrogea (Romania) have been reported. Two specimens with discoid imprints are described here in detail and assigned to the typical Ediacaran species Beltanelliformis brunsae Menner in Keller, Menner, Stepanov & Chumakov, 1974. This palaeontological development confirms both the large geographical distribution of this species and the Ediacaran age of the Histria Formation.

show abstract

“…This pattern is observed on the Digermulen Peninsula where the lower Ediacaran Nyborg Formation contains acanthomorphs (Agić et al 2018), whereas the strata above in the Stáhpogieddi Formation are mostly barren and relatively depauperate until Cambrian time. OWM assemblages of low diversity, with few eukaryotic forms, have also been reported from Argentina, Australia, Brazil, East European Platform, Namibia and Siberia (Germs et al 1986;Gaucher et al 2003;Grey, 2005;Leonov & Ragozina, 2007;Chiglino et al 2015;Kolesnikov et al 2015;Ragozina et al 2016;Arrouy et al 2019;Arvestål & Willman, 2020). Late Ediacaran acanthomorphic acritarchs were found in Mongolia (Anderson et al 2019) and in a drillcore from Siberia (Grazhdankin et al 2020), but these occurrences are exceptions among the generally low-diversity late Ediacaran OWM assemblages.…”

Section: A Ediacaran Granomarginatamentioning

confidence: 92%

Late Ediacaran occurrences of the organic-walled microfossilsGranomarginataand flask-shapedLagoenaforma collarisgen. et sp. nov.

et al. 2021

View full text Add to dashboard Cite

New occurrences of flask-shaped and envelope-bearing microfossils, including the predominantly Cambrian taxon Granomarginata, are reported from new localities, as well as from earlier in time (Ediacaran) than previously known. The stratigraphic range of Granomarginata extends into the Cambrian System, where it had a cosmopolitan distribution. This newly reported Ediacaran record includes areas from Norway (Baltica), Newfoundland (Avalonia) and Namibia (adjacent to the Kalahari Craton), and puts the oldest global occurrence of Granomarginata in the Indreelva Member (< 563 Ma) of the Stáhpogieddi Formation on the Digermulen Peninsula, Arctic Norway. Although Granomarginata is rare within the assemblage, these new occurrences together with previously reported occurrences from India and Poland, suggest a potentially widespread palaeogeographic distribution of Granomarginata through the middle–late Ediacaran interval. A new flask-shaped microfossil Lagoenaforma collaris gen. et sp. nov. is also reported in horizons containing Granomarginata from the Stáhpogieddi Formation in Norway and the Dabis Formation in Namibia, and flask-shaped fossils are also found in the Gibbett Hill Formation in Newfoundland. The Granomarginata–Lagoenaforma association, in addition to a low-diversity organic-walled microfossil assemblage, occurs in the strata postdating the Shuram carbon isotope excursion, and may eventually be of use in terminal Ediacaran biostratigraphy. These older occurrences of Granomarginata add to a growing record of body fossil taxa spanning the Ediacaran–Cambrian boundary.

show abstract

Association of macro- and microfossils in the Vendian (Ediacaran) postglacial successions in Western Mongolia

Cited by 8 publications

References 23 publications

Palaeobiology of latest Ediacaran phosphorites from the upper Khesen Formation, Khuvsgul Group, northern Mongolia

Palaeobiology of latest Ediacaran phosphorites from the upper Khesen Formation, Khuvsgul Group, northern Mongolia

Beltanelliformis brunsaeMennerinKeller, Menner, Stepanov & Chumakov, 1974: an Ediacaran fossil from Neoproterozoic of Dobrogea (Romania)

Late Ediacaran occurrences of the organic-walled microfossilsGranomarginataand flask-shapedLagoenaforma collarisgen. et sp. nov.

Contact Info

Product

Resources

About