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

K. U. Varma ¹, V. V. Shyam Sunder ¹, T. Y. Naidu ¹

Affiliations
1 Department of Geology, Andhra Univtrsity, Waltair 530003, IN

Abstract

Twenty-five ostracode taxa are recorded from the Tekkali Creek, East Coast o f India. Of these the following three new spxies are describ:d in detail: Hemicyiheridea bhatiai, Loxoconcha tekkaliensis and Neomnonoceratina jaini, while Neosinocyihcre dekrooni and Paijenborchella (Eopaijenborchella) mlaiensis are being reported for the first time from the Indian waters.

Keywords

Recent, Ostracoda, Tekkali Creek, East Coast.

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V. V. Shyam Sunderk ¹, K. U. Varma ¹, T. Y. Naidu ¹

Affiliations
1 Department of Geology, Andhra University, Visakhapatnarn - 530 003, IN

Abstract

Thirty-three species of Ostracoda have been identified from the Goguleru creek and the adjacent open beach, east coast of India. Of these, the following five species are described as new: Copytus coromandalensis, Loxoconcha guhai, Neocytheromorpha goguleruensis, Paijenborchellu keiji and Paradonostoma bhatiai. Keijia dernissa(Brady), 1868 is recorded for the first time from Indian waters.

Keywords

Recent, Ostracoda, Goguleru Creek, East Coast.

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T. Y. Naidu ¹, K. U. Varma ¹, V. V. Shyam Sunder ¹

Affiliations
1 Department of Geology, Andhra University, Visakhapatnam - 530 003, IN

Abstract

Twenty-nine species of Recent Ostracoda have been identified from the continental shelf sediments off Pentakota and Kalingapatnarn, Central East Coast of India. Of the twenty-nine species, five species are abundant, nine species are common and fifteen species are rare in occurrence. The distribution and diversity of the Ostracoda suggest that the inner and outer shelf environments are more favourable than the middle shelf of Pentakota whereas the inner shelf is more favourable than the middle and outer shelf environments off Kalingapatnam. On the whole, the Pentakota shelf environment is more favourable for the Ostracods to survive than Kalingapatnam shelf.

Keywords

Palaeontology, Recent Ostracoda, Continental Shelf, East Coast.

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Anjum Farooqui ¹, T. Y. Naidu ²

Affiliations
1 Birbal Sahni Institute of Palaeobotany, 53, University Road, Lucknow - 226 007, IN
2 Department of Geology, Andhra University, Visakhapatnam - 530 003, IN

Abstract

Palaeoclimate and palaeoecological study was carried out using palynological and thecamoebian evidences buried in ∼4 m vertically exposed sediment section (12 km inland from the present shoreline) of Late Holocene age along the banks of Gautami-Godavari River and from three shallow cores from its Nilarevu tributary, Andhra Pradesh. Inferred climatic periods include (1) a basal cold/arid period (∼3000-2000 yrs BP) with dominance of Botryococcus and other fresh water algal remains coupled with abundance of 25 species of thecamoebians indicating shallow and lentic ecosystem during most of the period and (2) a relatively Warm/Wet conditions (since ∼2000 yrs BP) reveal lotic fresh water ecosystem characterized by the evidences of tree palynotaxa and low percentage of thecamoebians. The three shallow cores (0.5 -1 m) near the mouth (∼8 km stretch) of the Nilarevu tributary reveal fluvio-marine deposition in the top 50-80 cm sediment unlike the deeper fresh water depositional environment suggesting sea water ingression in the recent decades. The study illustrates that the Gautami-Godavari River delta gradually prograded since ∼3000 yrs BP until 100-150 yrs unlike the intermittent relative sea level rise and fall recorded during the same period in the contemporary south-east deltaic areas.

Keywords

Palynology, Thecamoebians, Gautami-Godavari River, Sea Level, Climate.

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