The Bouguer gravity anomalies in the western part of Bengal Basin and part of eastern Bihar, India, can be explained in terms of basement relief which controls the thickness of the Gondwanas. This relief, however, has no influence on structure within the sedimentary section overlying the Gondwanas. During Gondwana times, the Bengal Basin continued further north at least up to Purnea, but in early Tertiary times, the continuity was interrupted by a basement feature passing through Jangipur and Malda.The main line of connection between peninsular India and the Shillong Plateau may be through the Rajmahal hills and the Darjeeling Himalayas.

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