Preliminary Sedimentology of the Siwaliks Group of Kach and Zarghun Areas, Baluchistan
Abstract
Sedimentary structures, palaeocurrent directions and vertical variations of facies associations were studied in the Siwalik Group of Kach area show derivation of detritus from the nearby mountain ranges. Furthermore, it is proposed that the Nagri Formation is a deposit of braided channel system and the Dhok Pathan and Soan Formations, those of meandering channel systems. Although the Dhok Pathan and Soan Formations are the prodrrcts of meandering rivers, they show contrasting facies associations. The Soan Formation is characterised by pebble and cobble conglomerate members in their lower part pointing to relatively low-sinuosity and high energy conditions. Such conglomerate members are lacking in the Dhok Pathan Formation in which clay units dominate over sandstone units and suggest a relatively high-sinuosity and low energy conditions
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