37 2m 2m 2m Σ = 6m interbeds of carbonaceous shale moderate white lignite stringers of siltstone w/ carb. shale stringers and sandstone in beds ranging from .25 to .75 m thick. med brown weathered look 38 .4 lignite w/ 6 inch underclay 39 2m 2.9 m Σ = 4.9 m same as 37 40 4.3 m grayish brown shale friable w/ .2 m lignite at base laterally equivalent to unit 41 rubble colluvium at base