21. The West Siberian Plain consists mostly of Cenozoic alluvial deposits and is somewhat flat. 22. The first group contains alluvial deposits , alevrite, sand, QH-QPH grit. 23. Alluvial deposits of varying fertility cover the relatively flat landscapes of the coastal plains.24. Barisal is an alluvial deposit , but the date of its formation is not known. 25. Only the alluvial deposits are being worked employing 15, 000 miners around the Lake. 26. Historically diamonds were known to be found only in alluvial deposits in southern India. 27. The islands are composed of alluvial deposits from the erosion of the Scarborough Bluffs. 28. It is made up of alluvial deposits from the Yangtze River and its tributaries. 29. Some of the valleys are floored with alluvial deposits . 30. The existing dam had been built on alluvial deposits , which could liquefy during an earthquake.
