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Haflong Thrust


Haflong Thrust the most persistent of the thrusts in the Belt of Schuppen, and for 400-km along it Lower Tertiary beds have moved to the north-west over higher beds, that is, the downthrown is on the north-west. The Naga-Disang (Haflong) Overthrust area includes besides the Naga Hills proper, a few long ranges of hills fringing the plain of Upper Assam, and a large part of the North Cachar Hills (the Belt of Schuppen). In the Belt of Schuppen eight separate overthrust sheets or nappes have been recognised. The frontal sheets rest on almost horizontal Tertiary beds of the foreland Spur and has itself been overthrusted by various other sheets. These overthrusts form a complex pattern, higher ones in places overriding the lower ones, so that the frontal thrust, although conventionally known as the Naga thrust, is within a distance of 100-km, seen to be composed of four different thrusts. The uppermost thrust is known as the Haflong (Disang) thrust. In the North Cachar Hills it overrides all the lower thrusts to rest directly on the Foreland Spur. The exposed parts of the thrust sheets nearest the plains are composed principally of rocks of Tipam Series. The exposed parts of the higher thrust sheets are usually made up of chiefly rocks of the Barail Series. [ASM Woobaidullah]

See also haflong fault.