Department Of Geography

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Author: search.filters.author.Sharma, K. MilankumarEnd date: 2020

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    Microfossil Assemblage from Dhok Pathan Formation (Middle Siwaliks) exposed near Polian Prohita, Una District, Himachal Pradesh, India
    (The Society of Earth Scientists, 2015) Sharma, K. Milankumar; Singh, Shyam Sundar; P.V., Vipina
    The Fluvial molassic sediments of Middle Siwalik which is considered to be deposited within the time range from 10.1-5.1 Ma holds a long record of the provenance and palaeoenvironmental history of Siwalik foreland basin. A mudstone bed of Dhok Pathan Formation exposed near Polian Prohita, Una district, Himachal Pradesh has yielded a diverse fossil assemblage. The present assemblage include mollusks Parreysia sp., Lamillidens sp., Melanoides sp. and Gyraulus sp. The charophytes include Chara globularis globularis, Chara globularis aspera, Chara sp. indet, Lychnothamus breviovatus and Lamprothamnium papulosum. Ostracodes Stenocypris sp. and Candona sp. have also been reported here. Fish teeth of certain morphotypes belonging to the Channidae and Cyprinidae families were also recorded. The majority of the fossil assemblage suggested that a warm tropical to subtropical humid climatic condition was prevailing during the deposition of these sediments. As this fossil assemblage is found restricted to a particular mudstone bed it can be inferred that there existed a localized swampy to overbank pond environment in within the braided river system deposits of Dhok Pathan Formation.
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    Lithostratigraphy, trace fossils and palaeoenvironment of Paleogene sequences in Parwanoo-Subathu sector of Himachal Himalaya, India
    (Geological Society of India, 2018) Singh, Ram Jivan; Sharma, K. Milankumar; Kumar, Pankaj; Ghosh, T.
    The Paleogene belt of the Outer Himalaya in the Shimla Hills is represented by the Paleocene to Lower Miocene ma-rine to ?uvial rocks of the Sirmur Group which is divisible into the Subathu, Dagshai and Kasauli formations in younging order in Parwanoo-Subathu area of the Himachal Pradesh, India. The shallow marine fossil bearing Subathu Formation overlies the various Proterozoic lithostratigraphic units like the Simla Group, Krol Group, Baliana Group, Shali Group/Deoban Group and others with an unconformable contact marked by a thin layer of oxidized and ferruginised laterite, indicating prevalence of warm tropical climate before deposition of these shallow transgressive marine rocks. The Subathu Formation grades upward into ?uvial deposits,compris-ing an alternate sequence of reddish-purple mudstone and ?ne to medium grained, reddish-brown sandstone of the Dagshai Formation along with multiple palaeosol horizons. The rocks of the Dagshai Formation are further gradationally overlain by the plant fossil bear-ing ?uvial sequence of medium to coarse grained, massive, multistory, greenish-grey micaceous sandstone and minor grey-orange mudstone of the Kasauli Formation. In response to southward leading deformation front of the Himalayan orogeny, due to collision tectonics of the Indian and Eurasian plates, the para-autochthonous Paleogene fold-thrust belt exposed between the northerly dipping Main Boundary Thrust (MBT)/Krol Thrust in north and the Main Boundary Fault (MBF) in the south shows repetition of some forma-tions of the Sirmur Group along Parwanoo-Darampur-Barog-Subathu section of the Himachal Himalaya. The abundance of vertical and cylindrical burrows of Skolithos linearis, S. annulatus, S. ingen, S. bulbus, Ophiomorpha esp., Thallasinoides paradoxides, etc. within the upper part of the Subathu Formation suggest lower intertidal to subtidal environment. This ichnofossil assemblage along with Skolithos-Thallasinoids-Ophiomorpha represent littoral zone, intertidal to subtidal environment of deposition
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    Phytosaurian Osteoderms From The Late Triassic Tiki Formation (Shahdol District, Madhya Pradesh), India
    (The Palaeontological Society of India, 2015) Sharma, K. Milankumar; Kumar, Jitendra
    The Late Triassic fossiliferous deposits of the Tiki Fomation of the South Rewa Gondwana Basin of India, is well known for its vertebrate fossil assemblages including temnospondyl tetrapods, archosauroform rhynchosaur, and several crurotarsans such as phytosaurs and rauisuchids. The present paper describes some phytosaurid osteoderm remains for the ?rst time from the Tiki Formation. These osteoderms are found together with phytosaurian teeth, jaw and vertebrae. On the basis of their texture, shape, size, morphology and association with phytosaurian remains, the present specimens have been assigned to phytosaurids