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Parihar, V. S.

The Wood-Boring Trace Fossil Asthenopodichnium from Palaeocene Sediments of the Barmer Hill Formation, Western Rajasthan, India

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Authors

S. C. Mathur ¹, N. S. Shekhawat ¹, S. L. Nama ², C. P. Khichi ¹, A. Soni ¹, Saurabh Mathur ¹, V. S. Parihar ¹

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

Source

Current Science, Vol 114, No 07 (2018), Pagination: 1544-1548

Abstract

The present study documents the wood-boring trace fossil Asthenopodichnium from the Palaeocene sediments of the Barmer Hill Formation (BHF) in the Barmer Basin, Western Rajasthan, India. The Asthenopodichnium trace fossils are loosely to tightly packed, pouch-like burrows or almond-shaped structures identified as Asthenopodichnium lignorum, whereas lozenge and J-shaped structures are designated as Asthenopodichnium lithuanicum. The A. lignorum trace markers are considered to be the feeding and dwelling burrows produced by wood-rotting fungi, whereas A. lithuanicum are interpreted as feeding and dwelling burrows produced by Mayfly nymphs and larvae. The sedimentological and palaeontological studies of trace fossil-bearing horizons of BHF suggest freshwater fluvial sedimentary environment with humid to sub-humid climate.

Keywords

Asthenopodichnium, Freshwater Environment, Trace-Fossils, Wood-Rotting Fungi.

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References

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Mathur, S. C., Shekhawat, N. S., Khichi, C. P., Soni, A., Nama, S. L. and Parihar, V. S., A first report of wood-boring trace fossil Asthenopodichnium and Teredolites from the Barmer Hill Formation of the Barmer Basin, Western Rajasthan, India. In 35th International Geological Congress, Cape Town, South Africa, abstr., 2016.

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Lockeia: The Bivalves Resting Trace Fossils from Early Jurassic to Bajocian Thaiat Member of Lathi Formation of the Jaisalmer Basin, Western Rajasthan, India

Abstract Views :203 | PDF Views:81

Authors

V. S. Parihar ¹, V. K. Meghwal ¹, Abhimanyu Singh ¹, S. L. Nama ¹

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

Source

Current Science, Vol 121, No 11 (2021), Pagination: 1452-1458

Abstract

This study focuses on the descriptions of well preserved numerous Lockeia traces of bivalves from the Early Jurassic to Bajocian Thaiat Member of Lathi Formation, Jaisalmer Basin, Western Rajasthan, India. Here, both ichnospecies Lockeia siliquaria and Lockeia cunctator have been recorded from the yellowish brown fine grained rippled calcareous silty sandstone in Thaiat Section. The L. siliquaria trace fossils are small, elongated almond-shaped and oval-shaped oblong body structures with smooth surfaces, occurring as positive hyporelief and more or less tapering at both ends. The L. cunctator trace fossils are small, almond-shaped oblong bodies with smooth surface structures, occurring as positive hyporelief with linear and club-shaped arrangement. The ichnotaxon L. siliquaria represents those places where the bivalve stopped temporally for feeding, whereas the L. cunctator are interpreted as locomotion traces with a resting or probing component of bivalves. Based on Lockeia trace fossil assemblages with associated fauna and trace fossils, we suggest shallow-marine environment for the upper part of the Thaiat Member of Lathi Formation.

Keywords

Bivalves, Lockeia, Early Jurassic to Bajocian, Jaisalmer Basin, Lathi Formation, Resting Trace Fossils, Thaiat Member.

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Trilobozoan (Tribrachidium and Albumares) Ediacaran Organisms from 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, IN

Source

Current Science, Vol 124, No 4 (2023), Pagination: 485-490

Abstract

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

Abstract Views :93 | PDF Views:52

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

Abstract Views :61 | 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

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