Palaeobiology of Indian Proterozoic and Early Cambrian Successions— Recent Developments

Шарма, Мукунд; Tiwari, Meera; Ahmad, Shamim; Shukla, Rajita; Shukla, Bandana; Singh, Varsha; Pandey, SK; Ansari, Amir H.; Shukla, Yogmaya; Kumar, Sanjeev

doi:10.16943/ptinsa/2016/48468

Cited by 17 publications

(10 citation statements)

References 15 publications

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“…The acritarch-bearing Changzhougou Formation in China was previously dated at 1.80 Ga, which would make it older than the Ruyang Group, but was later dated to ~ 1.67-1.64 Ga (e.g., Lamb et al 2009;Peng et al 2009;Miao et al 2019). This age range is fairly similar to that of other notable acritarch records such as the ~ 1.65 Ga old Mallapunyah Formation in Australia (Javaux 2007) and the ≤ 1.63 Ga old Vindhyan Supergroup in India (Ray et al 2002;Prasad et al 2005;Singh and Sharma 2014;Sharma et al 2016). A further important microfossil record of early eukaryote diversity is the ~ 1.50 Ga old Roper Group in Australia (Javaux et al 2001;Javaux and Knoll 2017).…”

Section: Introductionsupporting

confidence: 53%

Molecular fossils within bitumens and kerogens from the ~ 1 Ga Lakhanda Lagerstätte (Siberia, Russia) and their significance for understanding early eukaryote evolution

Duda

König

Reinhardt

et al. 2021

PalZ

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The emergence and diversification of eukaryotes during the Proterozoic is one of the most fundamental evolutionary developments in Earth’s history. The ca. 1-billion-year-old Lakhanda Lagerstätte (Siberia, Russia) contains a wealth of eukaryotic body fossils and offers an important glimpse into their ecosystem. Seeking to complement the paleontological record of this remarkable lagerstätte, we here explored information encoded within sedimentary organic matter (total organic carbon = 0.01–1.27 wt.%). Major emphasis was placed on sedimentary hydrocarbons preserved within bitumens and kerogens, including molecular fossils (or organic biomarkers) that are specific to bacteria and eukaryotes (i.e. hopanes and regular steranes, respectively). Programmed pyrolysis and molecular organic geochemistry suggest that the organic matter in the analyzed samples is about peak oil window maturity and thus sufficiently well preserved for detailed molecular fossil studies that include hopanes and steranes. Together with petrographic evidence as well as compositional similarities of the bitumens and corresponding kerogens, the consistency of different independent maturity parameters establishes that sedimentary hydrocarbons are indigenous and syngenetic to the host rock. The possible presence of trace amounts of hopanes and absence of steranes in samples that are sufficiently well preserved to retain both types of compounds evidences an environment dominated by anaerobic bacteria with no or very little inputs by eukaryotes. In concert with the paleontological record of the Lakhanda Lagerstätte, our study adds to the view that eukaryotes were present but not significant in Mesoproterozoic ecosystems.

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Section: Introductionsupporting

confidence: 53%

Molecular fossils within bitumens and kerogens from the ~ 1 Ga Lakhanda Lagerstätte (Siberia, Russia) and their significance for understanding early eukaryote evolution

Duda

König

Reinhardt

et al. 2021

PalZ

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“…The Kurnool Group may be reaffirmed as distinctly Neoproterozoic in age, with zircons dated at 913 ± 11 Ma occurring in the Paniam Quartzite. To a large extent, this is consistent with the biotic remains reported from the Kurnool Group (Sharma et al, 2016;Sharma and Singh, 2019).…”

Section: Age Of Sequencessupporting

confidence: 89%

“…Several carbonaceous organic remains and cyanobacteria have been reported from this horizon (Sharma et al, 2016;Sharma and Singh, 2019). Of these, Chuaria and Obruchevella have been considered to be diagnostic of upper Neoproterozoic age and suggest the correlation of the Kurnool Group with the comparable biota from the Bhima, Vindhyan and Chattisgarh basins.…”

Section: Owk Shalementioning

confidence: 98%

Cuddapah Basin, India: A Collage of Proterozoic Subbasins and Terranes

Kale¹,

Saha²,

Patrabnis-Deb³

et al. 2020

PINSA

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The sedimentary sequences and associated magmatic rocks from the Cuddapah basin and adjoining fold belts on the eastern margin of the Dharwar craton of Peninsular India are repositories of several economic mineral deposits, including radioactive mineral deposits. Growing evidence suggests that the array of subbasins (on the western side), the Nallamalai Fold Belt, and the eastern Nellore Schist Belt represent independent terranes that were tectonically connected. Paleoproterozoic-Mesoproterozoic extensional passive margin development with the attached oceanic realm, followed by Mesoproterozoic collisional tectonics and a subsequent Neoproterozoic extensional regime resulted in the present configuration of this region. A review of recent publications suggests that several traditional views deserve to be modified. This region needs to be examined in light of the emerging models of Proterozoic supercontinental assembly and break-up. Open areas of debate and gaps in confirmatory evidence for such models are discussed to provide directions for future studies.

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“…Remarks: The ribbon-like carbonaceous fossil Tyrasotaenia was initially recorded from the fine-grained clastic sediments of the 900 Ma Russian Platform (Gnilovskaya, 1971) and later from the 1,300 Ma Belt Supergroup, Montana (Walter et al, 1976); Little Dal Group, Mackenzie Mountains, Northwestern Canada (Hofmann and Aitken, 1979). In India, such types of carbonaceous filaments are known from the Proterozoic Vindhyan Supergroup (Shukla and Sharma, 1990;Sharma, 2006;Sharma et al, 2016). Based on its morphological similarity to stalks of Chorda and Scytosiphon belonging to the Phaeophyta, Tyrasotaenia podolica may be a remnant of benthic macroalga/seaweeds.…”

Section: Systematic Palaeontologymentioning

confidence: 99%

New Material of Carbonaceous Compressions from the ∼1.5 Ga Singhora Group, Chhattisgarh Supergroup, India, and their Interpretation as Benthic Algae

Singh

Шарма

2022

Front. Earth Sci.

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The origin, antiquity, and affinity of benthic seaweeds (multicellular algae) in the geological past are shrouded in mystery due to their preservation bias. In this study, we present a new material of well-preserved carbonaceous compression fossils in shale horizons of the Mesoproterozoic (ca. ∼1,500–1,300 Ma) Singhora Group of the Chhattisgarh Supergroup. Eleven distinct taxa, including one new taxon, Palaeoscytosiphon shuklaii, n. gen. et. sp., and one new species, Jiuqunaoella sergeevii, n. sp., are established. Four unidentified morphologies are also reported. Morphologically, the carbonaceous fossils are fan-shaped, palmate, elongated, leaf-like algal thalli with/without holdfast at the base, isolated or dichotomously branched long filaments, along with multicellular reproductive structures. The results of laser Raman spectroscopy and energy dispersive X-ray spectroscopy (EDX) are also presented in support of their biogenicity. Collectively, the preservation mode of the Singhora carbonaceous fossils suggests multicellular algal affinity and adds to a Burgess Shale-type (BST) taphonomic window in the Pre-Ediacaran biosphere.

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Palaeobiology of Indian Proterozoic and Early Cambrian Successions— Recent Developments

Cited by 17 publications

References 15 publications

Molecular fossils within bitumens and kerogens from the ~ 1 Ga Lakhanda Lagerstätte (Siberia, Russia) and their significance for understanding early eukaryote evolution

Molecular fossils within bitumens and kerogens from the ~ 1 Ga Lakhanda Lagerstätte (Siberia, Russia) and their significance for understanding early eukaryote evolution

Cuddapah Basin, India: A Collage of Proterozoic Subbasins and Terranes

New Material of Carbonaceous Compressions from the ∼1.5 Ga Singhora Group, Chhattisgarh Supergroup, India, and their Interpretation as Benthic Algae

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