Ediacaran microbiota from the Baliana and Krol groups, Lesser Himalaya, India
Bibliographic record
Abstract
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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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".