Proterozoic braided ephemeral fluvial deposits: an example from the Dhandraul Sandstone Formation of the Kaimur Group, Son Valley, central India

Ajit Bhattacharyya, Sadoon Morad

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Abstract

The Dhandraul Sandstone Formation of the Middle Proterozoic Kaimur Group, the Vindhyan Supergroup, Son Valley, India, has been reinterpreted to represent a product of braided ephemeral fluvial environment. The previous interpretation was shallow-marine barrier bar. Evidences in favour of braided-river deposition of the Dhandraul Sandstone are: (a) cosets of low-angle planar cross-bed sets are closely associated with cosets of parallel-laminated sets with particle streaming on bedding plane surfaces; (b) vertical recurrence of planar, laterally impersistent erosional surfaces that are invariably carpeted by red-coloured intraformational shale pebble conglomerate; (c) profuse development of ripple marks; (d) sedimentary structures indicative of critical to supercritical flow conditions; and (e) consistent palaeocurrent patterns.

Original languageBritish English
Pages (from-to)101-114
Number of pages14
JournalSedimentary Geology
Volume84
Issue number1-4
DOIs
StatePublished - Apr 1993

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