Pebble Fabric Analysis of the Talchir Boulder Bed in the Jharia Coalfield, Bihar

The Talchir boulder bed in the Jharia Coalfield, has been studied with special reference to the fabric of the particles that constitute it and an attempt has been made to determine the nature and direction of the depositing agency.

Studies on pebble orientation show that the particles are preferentially oriented in all the sections studied and exhibit an upstream imbrication. The inclination is of the same order of magnitude as determined by Cailleux for fluvial gravels.

The streams that deposited these ancient gravels came from a general westerly and north-westerly direction as shown by the fabric diagrams. It is inferred that the source of the debris was the moraine material left by melting glaciers and that the debris was transported east and south-eastwards by fast flowing streams into the basin of deposition.