Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

V. K. Mathur ¹, Ashutosh Joshi ¹, Gopendra Kumar ¹

Affiliations
1 Himalayan Geology Division, Geological Survey of India, Sector E, Aliganj, Lucknow 226 020, IN

Abstract

Two assemblages of ichnofossils are recorded from the Cambrian Tal Formation, Nigalidhar Syncline, Himachal Lesser Himalaya. The assemblage-I. occurring in the Arenaceous Member 300m below the horizon yielding redlichiid trilobite and brachiopod faunas of Tsanglangpuian Stage of Early Cambrian, contains forms like Rusophycus sp. aff. R. carinata Seilacher, monomorphichnus lineatus Crimes, Diplichnites spp.) Gordia sp., Astropolichon sp., ichnogenus A and ichnogenus B. The assemblage-II, in the Phulchatti Member ('Upper Tal'), includes Cruziana sp. and ichnogenus C cf. Buthotrephis. It occurs in sediments 70 m above the horizon containing trilobites and brachiopods. The former assemblage is of world-wide distribution in Lower Cambrian (upper Meishucunian to Lower Qiongzhusian), and thus, in the absence of microfauna, can be utilised in identifying Early Cambrian successions.

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Ashutosh Joshi ¹, V. K. Mathur ¹, D. K. Bhatt ¹

Affiliations
1 Geological Survey of India, IN

Abstract

The paper records the first find of identifiable redlichid trilobites, belonging to two genera, from the strata of the Arenaceous Member of the Tal Formation in the Garhwal Syncline. This fossil horizon in the Garhwal Syncline, in the past, has also yielded small shelly fossils. The chronostratigraphic designation of this small shelly fauna in the Qiongzhusian (? Atdabanian) Stage of China now stands corrected with the present discovery. The trilobite genera correspond to the Botomian Stage (1 Tsanglangpuian Stage of China), in the Early Cambrian.

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V. K. Mathur ¹, Ashutosh Joshi ¹

Affiliations
1 Himalayan Geology Division, Geological Survey of India, Lucknow 226020, IN

Abstract

This note records the presence of the Lower Cambrian trilobite Redlichia noetlingi and an unidentified trilobite in association with brachiopods from the basal part of the Phulchatti Member of the Tal Formation in the Mussoorie Syncline, Uttar Pradesh.

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Ashutosh Joshi ¹, R. C. Mehrotra ²

Affiliations
1 Project Himalayan Geology, Geological Survey of India, Sector E, Aliganj, Lucknow - 226 024, IN
2 Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow - 226 007

Abstract

The present fossil material comprising both dicotyledonous and monocotyledonous leaf impressions, was collected from the Siwalik sediments of West and East Kameng districts, Arunachal Pradesh, India. The distribution of the modern comparable forms of the fossils suggests that the flora was typically tropical indicating the prevalence of a warm and humid climate in the region during the Mio-Pliocene.

Keywords

Leaf impressions, Siwalik, Mio-Pliocene, Palaeoecology, West and East Kameng districts, Arunachal Pradesh.

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Ashutosh Joshi ¹, R. C. Mehrotra ²

Affiliations
1 Geological Survey of India, Sector E, Himalayan Geology Division, Aliganj, Lucknow - 226 024, IN
2 Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow -226 007, IN

Abstract

No Abstract.

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