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Late Miocene siliceous endoskeletal dinoflagellates from the Sawai Bay Formation, Neill Island, Andaman Sea, India

Jyotsana Rai
Late Miocene siliceous endoskeletal dinoflagellates from the Sawai Bay Formation, Neill Island, Andaman Sea, India
Journal of Micropalaeontology (April 2006) 25, Part 1: 37-44

Abstract

Siliceous spicules of endoskeletal dinoflagellates form a very small part of the siliceous microfossil assemblage from Neill Island, Ritchie's Archipelago, Andaman Island and Nicobar Island. They are represented here by a solitary genus, Actiniscus, with two species - Actiniscus pentasterias and Actiniscus elongatus. Light microscopy, supported by scanning electron microscopy, illustrates its remarkable symmetry and geometry. Though biostratigraphically unimportant, this genus has considerable value in deriving palaeoecological interpretations. Their association with age-diagnostic calcareous nannofossil taxa indicates that the glauconitic mudstones of the Sawai Bay Formation of Nipple Hill and East Coast sections are Late Miocene in age, equivalent to the Discoaster berggrenii Subzone (Subzone CN9A) corresponding to the lower part of the Discoaster quinqueramus Zone (Zone NN11).


ISSN: 0262-821X
EISSN: 2041-4978
Serial Title: Journal of Micropalaeontology
Serial Volume: 25, Part 1
Title: Late Miocene siliceous endoskeletal dinoflagellates from the Sawai Bay Formation, Neill Island, Andaman Sea, India
Author(s): Rai, Jyotsana
Affiliation: Birbal Sahni Institute of Palaeobotany, Lucknow, India
Pages: 37-44
Published: 200604
Text Language: English
Publisher: British Micropalaeontological Society, London, United Kingdom
References: 22
Accession Number: 2006-079591
Categories: StratigraphyPaleobotany
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: strat. cols., 2 plates, geol. sketch map
N11°49'60" - N11°49'60", E93°01'60" - E93°01'60"
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 200622
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