Storm activities during the sedimentation of late Paleocene-middle Eocene Subathu Formation,western Himalayan foreland basin |
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| Authors: | B P Singh A K Srivastava |
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| Institution: | (1) School of Geosciences, Monash University, P.O. Box 28E, Victoria 3800, Australia |
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| Abstract: | Late Paleocene-middle Eocene Subathu Formation represents the earliest deposits of the western Himalayan foreland basin. A
large part of this formation is comprised of impure limestone and grey shale intercalations. The limestones contain sole marks,
intraformational conglomerates, hummocky cross stratification and wave ripples. The occurrence of sole marks suggests that
they are developed by the unidirectional currents at the initial phase of the storm that resulted erosion and subsequent deposition.
The intraformational limestone conglomearate also suggests erosion of the earlier deposited limestone hardgrounds as a consequence
of storm associated transgression. The hummocky cross stratification formed by the oscillatory flows during the long-shore
littoral drift. The depth of formation of the hummocky cross stratified limestone facies was less than 40 m and most likely
deposited between shore-face to backshore regions of the gulf similar to present day Persian Gulf. The identification of deeper
facies (shelf facies) from Pakistan and coastal facies from India suggest that the gulf was open from the west and closed
from the east. |
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