Unit  no. Period Depth Color Lithologic description (meter)  Unit 1 Holocene 1.5-3.1 Blackish and ash Deep grey clay  Unit 2 Holocene 3.1-4.5 Deep black to dark black Massive clay in texture, sometimes mixed by sandy silt Unit 3 Holocene 4.5-5.5 reddish brown to deep black Sandy mud and clay in sedimentary structure Unit 4 Holocene 5.5-6.7 dark black Light grey colored clay and decomposed organic matter Unit 5 Holocene 6.7-9.1 reddish black to grayish black Clay and silt Unit 6 Holocene 9.1-9.8 Gray Silt clay Unit 7 Holocene 9.8-10.7 light bluish-grey to dark bluish-grey mud Fine silt and organic matter is rich Unit 8 Holocene 10.7-3.7 bluish-grey to radish grey mud section Silt to clay Unit 9 Pleistocene 13.7-5.2 Red Sand and silt

Table 1: Stratigraphic description at Sutrapur.