Shelf progradation : Interpretation from seismic facies of eastern India

Abstract

Analyses of shallow seismic profiles on the outer continental shelf, between Krishna and Godavari valleys off central east cost of India, reveal prograding sedimentary sequences on the shelf as well as on the flanks of the valleys. The progradation on the outer shelf is associated with palaeovalleys. A non-depositional / erosional unconformity surface has been recognised throughout the shelf at 20-25m subsurface. This is followed by a transgressive sequence of progradational sediments deposited during rising eustatic sea level accompanied by subsidence of the sea floor.