Section 8421 On cliff north of Camp across the forest general appearance 8421a channel 8421 fossil forest coal helicopter, landing Unit no. Thickness (cm) Description 1 170 Rippled quartzite sand. 2 40 F to carbonaceous sand + clay 3 825 Coal 4 50 cemented mudstone soil crust 5 140 coal 6 165 yellow weathering mudstone with ironstone conc. 7 370 Coal with petrified stumps and soil levels, ironstone. 8 990 Cross bedded sandstone carbon on bedding plane, fine grained, buff color ironstone 9 165 carbonaceous shale w/ ironstone 10 100 coal 11 450 gray clay w/ironstone conc interbedded nodular soils