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Here we describe the Tribrachidium and Albumares Ediacaran organisms belonging to phylum Trilobozoa in the Sonia Sandstone of Marwar Supergroup, western India. Between the two Ediacaran genera, Albumares brunsae was the first to be discovered in India, while Tribrachidium heraldicum was the first record from the Marwar Supergroup. T. heraldicum is soft-bodied, discoidal or disc-shaped (in plane view) and slightly conical-shaped (when found with up to 2 mm vertical relief) with three elevated lobes (arms) or ridges bounded by a well-defined peripheral ring. A. brunsae is soft-bodied, flattened, low-relief, circular to sub-circular and with a tri-lobed (three elevated arms/rays) shield having branching rays that radiate outward from the centre to the outer edge of the peripheral ring. Both Ediacaran taxa occur here as convex or positive reliefs with triradial symmetry on medium to fine-grained sandstone bedding planes in the Sursagar area and show the Flinders Ranges style of preservation.

Keywords

Albumares, Ediacaran Organisms, Sandstone, Tribrachidium, Trilobozoans.

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References

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Parihar, V. S., Ram, H., Nama, S. L. and Mathur, S. C., Aspidella: the Ediacaran body fossil from the Jodhpur Sandstone of Marwar Supoergroup, Sursagar area, Jodhpur, Western Rajasthan, India. Estud. Geol. Madrid, 2019, 75(2), e109; ISSN-L: 0367-0449.

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Triangular-Shaped Ediacaran Fossil Thectardis Avalonensis From the Sonia Sandstone, Jodhpur Group, Marwar Supergroup, Western India

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Authors

V. S. Parihar ¹, Hukmaram ¹, Pawan Kumar ¹, Anshul Harsh ¹

Affiliations
1 Department of Geology, Jai Narain Vyas University, Jodhpur 342 005, India., IN

Source

Current Science, Vol 124, No 9 (2023), Pagination: 1095-1100

Abstract

The present study records the triangular-shaped Ediacaran fossil identified as Thectardis avalonensis from the Sonia Sandstone of Jodhpur Group, Marwar Supergroup, western India. These Ediacaran fossil specimens are preserved in convex (positive) relief, but one is in negative relief on the bedding planes of sandstone in the Sursagar mines area. T. avalonensis is well-preserved, unskeletonized, elongated and triangular in shape, with sharp, raised marginal rims or ridges that widen at the triangular base and taper towards the apex of the organism. This Ediacaran triangular-shaped T. avalonensis organism is recorded for the first time from India. The phylogenetic affinity of T. avalonensis is still uncertain, as some have interpreted it as a sponge based on a body plan consistent with the hydrodynamics of the sponge water-canal system, which lacked a mouth or movement and its length–width ratio of more than 1.6. As well as these, T. avalonensis may also belong to Diskagma-like lichen or living Cladonia-like lichen group and the Auroralumina-like cnidarian organisms of the Ediacaran crown group.

Keywords

Eukaryotic Organism, Fossil Specimens, Length– Width Ratio, Phylogenetic Affinity, Sandstone, Thectardis Avalonensis.

Full Text

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Parihar, V. S., Ram, H., Nama, S. L. and Mathur, S. C., Aspidella: the Ediacaran body fossil from the Jodhpur Sandstone of Marwar Supoergroup, Sursagar area, Jodhpur, western Rajasthan, India. Estud. Geol. Madrid, 2019, 75(2), e109, ISSN-L: 0367-0449.

Parihar, V. S., Hukmaram, Kumar, P., Khichi, C. P. and Harsh, A., Hiemalora stellaris from Ediacaran Sonia Sandstone of Jodhpur Group of Marwar Supoergroup, western Rajasthan, India. J. Geol. Soc. India, 2021, 97, 1447–1453.

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Nimbia: The Discoid Organisms from Ediacaran Sonia Sandstone of Jodhpur Group, Marwar Supergroup, Western India

Abstract Views :60 | PDF Views:30

Authors

Hukmaram ¹, Anshul Harsh ¹, Pawan Kumar ¹, V. S. Parihar ¹

Affiliations
1 Department of Geology, Jai Narain Vyas University, Jodhpur 342 005, IN

Source

Current Science, Vol 125, No 9 (2023), Pagination: 999-1004

Abstract

In this study, we report well-preserved fossil remains of Nimbia from the Ediacaran Sonia Sandstone of Jodhpur Group, Marwar Supergroup in the Sursagar area of Jodhpur district, Rajasthan, western India. Here, two species of Nimbia, namely Nimbia occlusa and Nimbia dniesteri, have been recorded on medium- to fine-grained sandstone bedding surfaces. The N. occlusa forms are circular to ovate and elliptical imprints with a smooth and flat central part and enclosed by a single thick, annular marginal rim, whereas the N. dniesteri remains are circular to sub-circular discoid impressions with a trapezoidal structure. Here, the recorded N. occlusa is common compared to the N. dniesteri fossil forms in the Ediacaran Sonia Sandstone. These Nimbia fossil forms are found in the Sonia Sandstone in terrestrial to marginal marine habitats with moderate hydrodynamic forces.

Keywords

Discoid Organisms, Fossil Remains, Hydrodynamic Forces, Nimbia Species.

Full Text

References

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Kumar, S. and Pandey, S. K., Note in the occurrence of Arumberia bankshi and associated fossils from the Jodhpur sandstone, Marwar Supergroup, western Rajasthan. J. Palaeontol. Soc. India, 2009, 4(2), 41–48.

Srivastava, P., Largest Ediacaran discs from the Jodhpur Sandstone, Marwar Supergroup, India: their palaeobiological significance. Geosci. Front., 2014, 5(2), 183–191.

Parihar, V. S., New record of Ediacaran biota from the Jodhpur Sandstone of Marwar Supergroup, western Rajasthan, India. Estud. Geol. Madrid, 2019, 75(2), e108.

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