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Saddle-shaped reticulate Nummulites from Early Oligocene rocks of Khari area, SW Kutch, India
S SARKAR, S MUKHOPADHYAY,
Published in INDIAN ACAD SCIENCES
2011
Volume: 120
   
Issue: 2
Pages: 263 - 268
Abstract
Saddle-shaped reticulate Nummulites from the Early Oligocene rocks of Khari area, SW Kutch, India is reported here for the first time. Unusual shape of this Nummulites is due to the curved nature of the coiling plane, indicating space constrained postembryonic test growth. With regular development of chambers, septa and septal filaments, the saddle-shaped Nummulites constitutes the third morphotype of N. cf. fichteli Michelotti form A. Other morphotypes of the species reported earlier include inflated lenticular and conical tests. Multiple morphotypes of N. cf. fichteli form A indicates varied test growth in response to substrate conditions. Morphological variability exhibited by N. cf. fichteli form A from Kutch and some Early Oligocene reticulate Nummulites from the Far East are comparable. This faunal suite is morphologically distinct from the contemporary reticulate Nummulites of the European localities. © Indian Academy of Sciences.
About the journal
JournalJournal of Earth System Science
PublisherINDIAN ACAD SCIENCES
ISSN0253-4126
Open AccessYes