Palynology of Lower Palaeogene (Thanetian-Ypresian) coastal deposits from the Barmer Basin (Akli Formation, Western Rajasthan, India) : Palaeoenvironmental and palaeoclimatic implications
Tripathi, S. K. M. (Birbal Sahni Institute of Palaeobotany)
Kumar, M. (Birbal Sahni Institute of Palaeobotany)
Srivastava, D. (Birbal Sahni Institute of Palaeobotany)

Fecha:	2009
Resumen:	The 32-m thick sedimentary succession of the Paleocene-Eocene Akli Formation (Barmer basin, Rajasthan, India), which is exposed in an open-cast lignite mine, interbed several lignite seams that alternate with fossiliferous carbonaceous clays, green clays and widespread siderite bands and chert nodules. The palynofloral assemblages consist of spore, pollen and marine dinoflagellate cysts that indicate a Thanetian to Ypresian age. The assemblage is dominated by angiospermic pollen and specimens showing affinity with the mangrove Palm Nypa are also very abundant. The Nypa-like pollen specimens exhibit a wide range of morphological variation, some of the recorded morphotypes being restricted to this Indian basin. Preponderance of these pollen taxa indicates that the sediments were deposited in a coastal swamp surrounded by thick, Nypa-dominated mangrove vegetation. The dispersed organic matter separated from macerated residues indicates the dominance of anoxic conditions throughout the succession, although a gradual transition to oxic conditions is recorded in the upper part.
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l'obra original i es reconegui l'autoria.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Mangrove pollen ; Nypa ; Thanetian-Ypresian ; India
Publicado en:	Geologica acta, Vol. 7, Núm. 1-2 (Març-Juny 2009) , p. 147-160, ISSN 1696-5728

Adreça alternativa: https://raco.cat/index.php/GeologicaActa/article/view/125116
Adreça alternativa: https://revistes.ub.edu/index.php/GEOACTA/article/view/105.000000275
Adreça alternativa: https://revistes.ub.edu/index.php/GEOACTA/article/view/2051
DOI: 10.1344/105.000000275

14 p, 2.1 MB

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