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

Manoj Shukla ¹, Prabhat Kumar ², Anand Prakash ¹, G. P. Srivastava ¹, Madhav Kumar ¹

Affiliations
1 Birbal Sahni Institute of Palaeobotany, 53, University Road, Lucknow - 226 007, IN
2 Zoology Department, University of Lucknow, Lucknow - 226 007, IN

Abstract

A resin-embedded male Culex mosquito, beetle larvae and dwelling spaces viz., galleries and chambers of Ambrosia beetle were recovered from the shallow shoreline Tertiary sediments of Warkalli Formation exposed along Kerala coast. Lumps and rods of resin are found associated with the impure lignitic clay beds of the sequence. It indicates that the vegetation growing during that time was dominated by resin producing plants and the conditions were favourable for the insects to get entrapped in the gum. Such organic remains are useful in the study of fossil DNA

Keywords

Palaeontology, Warkalli Formation, Resin, Fossil Mosquito, Kerala.

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Madhav Kumar ¹, Anand Prakash ¹, G. P. Srivastava ¹, Manoj Shukla ¹

Affiliations
1 Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow - 226007, IN

Abstract

The organic matter dispersed in the upper Tertiary sediments of Mahuadanr valley has been studied in detail. It has been observed that the amorphous, structured terrestrial and biodegraded terrestrial organic matter represent the dominant types followed by black debris and fungal fruiting bodies. The dominance of amorphous organic matter suggests the prevalence of reducing conditions in the basin, patticularly during the deposition of the lower part of the sequence. The conditions gradually transformed into oxidising environment during the deposition of upper part of the succession. Besides this, the presence of black debris indicates moderate oxidising environment in the source area and also during the transport of the organic matter.

Keywords

Depositional Environment, Dispersed Organic Matter, Neogene, Mahuadanr Valley, Bihar.

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G. P. Srivastava ¹, Manoj Shukla ¹, Prabhat Kumar ², Madhav Kumar ¹, Anand Prakash ¹

Affiliations
1 Birbal Sahni institute of Palaeobotany, 53 University Road, Lucknow- 226 007, IN
2 Zoology Department, University of Lucknow, Lucknow-226 007, IN

Abstract

The remains of Pillbug and millipede from the resin lumps associated with the Tertiary sediments Kerala coast are reported here for the first time. These remains have been described as Armadillidium payangadensis sp nov and Polyxenus mecanica sp nov. The resin lumps containing Arthropod remains are Found associated with the Tertiary deposits( Warkalli Formation) exposed at several places along Kerala Coast. The fossil bearing resin lumps have been collected from Payangadi China Clay mine, Cannanore Kerala.

Keywords

Warkalli Formation, Pillbug, Upper Tertiary, Millipede Resin, Kerala.

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Madhav Kumar ¹, Romen Borgohain ²

Affiliations
1 Birbal Sahni Institute of Palaeobotany, 53, University Road, Lucknow - 226 007, U P, IN
2 0il India Limited Duliajan - 786 602, Assam, IN

Abstract

Dispersed organic matter of Cenozoic sediments are analyzed for palaeoenvironmental purposes of Bihpuria well - A, situated in the North Bank of River Brahmaputra, Upper Assam Basin Distribution pattern of the organic matter types with respect to various strata has been assessed to observe changes tn depositional environment Desptite using well cutting samples, quantitative and qualitative panlynofacies analyses in various sequences v17 , Late Palaeocene - Upper Eocene and Late Miocene to Pho-Pleistocene have been defined by core lithotypes, log data and characteristics ot organic matter content The results show a significant difference between anoxic and oxic facies with relative distribution of structured and non-structured debris Depositional set-up of anoxic/oxic facies is directly related to the supply of detritus fiom various sources, lithotypes and organic particles embedded therein, which also affect their preservation and biodegradation Palaeocene-Eocene sediments deposited under shallow marine conditions exhibit highly degraded phytoclasts (amorphous, grey and highly pyritized amorphous and biodegraded terrestrial/aquatic organic matter types) supplied from both terrestrial and marine sources These accumulated at basal horizons of the basin leading to anoxic conditions Carbonaceous shale of Kopili Formation (Late Eocene) IS represented here by thin bed than in other sections In the Assam-Arakan Basln, deposited under restricted marine conditions Upper part of the sections represented by the Tipam Group and Namsang Formation, which are examples of fluvio-lacustrine deposits, characterized by land derived, less biodegraded and moderate to richly oxidized phytoclasts The nature, occurrence and frequency of organic matter in these sedimentary sequences is discussed in detail.

Keywords

Palynofacies, Organic matter, Depositional Environment, North Bank of Brahmaputra, Assam.

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