Microbiota from the Kushalgarh Formation, Delhi Supergroup, India

Mandal, J.; Maithy, P.K.; Barman, G.; Verma, Kamlesh

doi:10.54991/jop.1984.1358

Cited by 4 publications

(5 citation statements)

References 12 publications

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“…The Sete Lagoas specimens are best placed in the genus Ghoshia, which is characterized by branching uniserial filaments consisting of largely undifferentiated cells. The new species proposed here, Ghoshia januarensis, resembles Ghoshia bifurcata Mandal and Maithy in Mandal et al, 1984 in cell size but differs in its more variable cell shape; Ghoshia januarensis has spherical, doliform, and polyhedral cells, whereas Ghoshia bifurcata is said to have "drum-shaped to rectangular" cells (Mandal et al, 1984). In addition, some specimens of Ghoshia bifurcata (including the holotype; Mandal et al, 1984, pl.…”

Section: Systematic Paleontologymentioning

confidence: 82%

“….-"A species of Siphonophycus with tubes 2-4 μm in cross-sectional diameter." Type species.-Ghoshia bifurcata Mandal and Maithy inMandal et al, 1984. Original diagnosis presented byMandal and Maithy in Mandal et al (1984).-"Thallus heterotrichous, erect filaments arising from basal horizontally creeping thallus, densely packed, truly laterally branched, with cells in one or two series; sheath absent; reproduction not observed." Goshia sp.…”

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confidence: 99%

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Organic-walled microfossils from the Ediacaran Sete Lagoas Formation, Bambuí Group, Southeast Brazil: taxonomic and biostratigraphic analyses

Denezine,

do Carmo,

Xiao

et al. 2024

J. Paleontol.

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This work presents a detailed taxonomic study on organic-walled microfossils from the Ediacaran Sete Lagoas Formation (Bambuí Group) at the Barreiro section in the Januária area of the São Francisco basin, Brazil. Seven species are described, including Siphonophycus robustum (Schopf, 1968), Ghoshia januarensis new species, Leiosphaeridia crassa (Naumova, 1949), Leiosphaeridia jacutica (Timofeev, 1966), Leiosphaeridia minutissima (Naumova, 1949), Leiosphaeridia tenuissima Eisenack, 1958, and Germinosphaera bispinosa Mikhailova, 1986. These taxa are recovered for the first time in the Sete Lagoas Formation. They occur abundantly in the lower portion of the studied section, but only Ghoshia januarensis is present in the upper part of the studied section, probably due to environmental or taphonomic changes. Leiosphaeridia species, particularly Leiosphaeridia minutissima, dominate the organic-walled microfossil assemblage. Although most taxa described here have long stratigraphic ranges, they are consistent with a terminal Ediacaran age as inferred from detrital zircon data and tubular fossils (e.g., Cloudina and Corumbella) from the Sete Lagoas Formation. UUID: http://zoobank.org/7f92b900-0176-4da6-93a3-fd51edb22cbf

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Section: Systematic Paleontologymentioning

confidence: 82%

mentioning

confidence: 99%

Organic-walled microfossils from the Ediacaran Sete Lagoas Formation, Bambuí Group, Southeast Brazil: taxonomic and biostratigraphic analyses

Denezine,

do Carmo,

Xiao

et al. 2024

J. Paleontol.

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“…These microfossils with clear cell structure can easily be distinguished from the extant acid treated specimens where cell contents have been lost. However, some specimens described as Pataeocytonema from shales (Mandai et at., 1984;pI. 2, fig.…”

Section: Discussionmentioning

confidence: 99%

Artificial chemical degradation of some extant cyanobacteria with special reference to Precambrian contaminants- A cautionary note-II

Shukla¹,

Misra

Шарма³

1990

JPS

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The paper is a cautionary note to all Precambrian palaeobiologists, using palaeopalynological techniques for the extraction of microfossils from Precambrian sediments. It deals with problems of contamination in palaeopalynological preparations. The effect of mineralic acids (HCI and HF) on some common cyanobacteria, viz., Microcystis, Nostoc, Oscillatoria, Lyngbya and Scytonema, has been discussed. It has been shown that the extant cyanobacteria after treatment with these mineralic acids show morphological similarities with many Precambrian microfossils. Therefore, there is a need to exercise more vigil while ascertaining the authenticity and affinity of the microfossils recovered through palaeopalynological techniques specially from Precambrian sediments.

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“…Remarks-The present form is morphologically similar to the known Palaeoanacystis vulgaris Schopf reported from the Bitter Springs Formation, Australia (Schopf, 1968), Belcher Islands, Canada (Hofmann, 1976), ill preserved from the Bagalkot Formation, Kaladgi Group (Viswanathiah et al, 1978(Viswanathiah et al, , 1984Venkatachalapathy & Ravindra, 1984); Bababudan Formation, Dharawar Supergroup (Viswanathiah & Venkatachalapathy, 1980), Voblapur Group (Venkatachalapathy & Basavaraju, 1986), Patherwa Formation of Semri Group (Nautiyal, 1983), Kushalgarh Formation, Delhi Supergroup (Mandal et al, 1984); Infra Krol Formation, Krol Belt, Nainital Synform and Buxa Dolomite Formation, Buxa Group (cited references in Shukla et al, 2006). Description-Compressed clumpy microfossils with sub circular outline, 36-88 µm, comprising long, tightly coiled whorls, aseptate filament of the unicellular form, width in range of 4-10 µm and upto several hundred milimicrons in length; central portion of coiled mass commonly missing, arrangement of coils more or less concentric, with successive whorls in well preserved specimens crossing at small acute angles; some specimens with expending coils apparently arranged with coaxial whorls.…”

Section: Kingdom-eubacteriamentioning

confidence: 99%

Ediacaran microbiota from the Baliana and Krol groups, Lesser Himalaya, India

Shukla¹,

Mathur

Babu³

et al. 2008

JPS

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The different lithofacies of Infra Krol Formation of Baliana Group, Chambaghat and Mahi formations of Krol Group exposed in eight synclines of the Krol Belt in Lesser Himalaya have yielded rich Ediacaran microfossil assemblage. It is the first comprehensive account of excellent preservation of microfossils from these synclines. The assemblage comprises forty-one (41) taxa; three groups of the organic-walled microfossils (OWM)- A. algae (cyanobacteria and rhodophytes), B. protists and C. unknown affinities of biological forms, viz. multicellular cylindrical tubular and vase shaped microfossils (VSM). Studied litho-units include the black carbonaceous shale of Infra-Krol Formation of the Baliana Group; the phosphatic black chert lenticles and shale partings associated with quartz arenite of Chambaghat (Krol Sandstone) and black chert nodules associated with argillaceous limestone and shale of Mahi formations of Krol Group. The microfossil yielding succession conformably overlies the Cap Carbonate - a global marker lithounit of Blaini Formation, the base of the Ediacaran Period. Infra Krol, Chambaghat and Mahi formations underlies the Jarashi and Kauriyala formations of Krol Group which have yielded diversified soft bodied Ediacaran metazoans. In the reported OWM assemblage, fifteen taxa of prokaryotes are comparable with the extant cyanobacteria belonging to Chroococcales, Entophysidales, Oscillatoriales and Nostocales. The acritarchs belonging to sphaeromorphida and sphaerohystrichomorphida subgroups are represented by twenty-two taxa. The two taxa of multicellular algal thalli (primitive/juvenile stage) of phylum Rhodophyta represents Wengania and Thallophyca, and single taxon of the two forms represented by vase-shaped microfossils (Melanocyrillium hexodiadema) and multicellular cylindrical tubular (Sinocyclocyclicus guizhouensis) of unknown affinities. The recovered assemblage has close affinities with those microfossils known from the Ediacaran sediments exposed in other parts of the world, viz. Australia, Brazil, Canada, China, Finland, Namibia, Norway, Spitsbergen, Svalbard, Sweden, and Russian platform. The Krol Belt assemblage is exclusively characterized by the dominance of distinctive large sized acanthomorphs acritarchs (Filisphaeridium, Echinosphaeridium, Tianzhushania, Ericiasphaera, Meghystrichosphaeridium and Papillomembrana) followed by medium sized Goniosphaeridium, Gorgonisphaeridium, Trachyhystrichosphaera, Cymatiosphaeroides, Vandalosphaeridium, etc.), small spinose acritarchs (Micrhystridium and Paracymatiosphaera) and a few breakable/characteristic cyanobacteria (Bavlinella, Salome, Obruchevella, Sinocyclocyclicus, etc.). With meagre radiometric data available for Krol Belt of Lesser Himalaya, the present microfossil assemblage is recognized in establishing the biostratigraphic and environment framework for the investigated successions. The present microbial assemblage corroborates the age of the above succession to Ediacaran Period (630-542 Ma) and also supports the view that these formations were laid down in a tidal flat environment.

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Microbiota from the Kushalgarh Formation, Delhi Supergroup, India

Cited by 4 publications

References 12 publications

Organic-walled microfossils from the Ediacaran Sete Lagoas Formation, Bambuí Group, Southeast Brazil: taxonomic and biostratigraphic analyses

Organic-walled microfossils from the Ediacaran Sete Lagoas Formation, Bambuí Group, Southeast Brazil: taxonomic and biostratigraphic analyses

Artificial chemical degradation of some extant cyanobacteria with special reference to Precambrian contaminants- A cautionary note-II

Ediacaran microbiota from the Baliana and Krol groups, Lesser Himalaya, India

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