- 2 - SECTION 8210 continued UNIT Lance Formation Mudstone: more massive (than at 1.33), 10YR 5/2, with plant fragments 1.37 .05 1.33 Mudstone: fissile, with comminuted plant remains .04 1.23 Shale: fissile, silty, 10YR 7/4, with scrappy plant remains, limonite staining .1 1.19 Siltstone: fissile, carbonaceous, 10YR 6/2, base of fine-grained and lignitic unit .04 Sandstone: with thin wavy stringers of fissile siltstone and some stringers of brownish mudstone with plant fragments. Upper 10 cm becomes increas- ingly brownish and carbonaceous. 0.75 0.84 - 0.86 Prominent brownish mudstone partings with platanoid and cercidiphyllod leaf impressions. .46 Sandstone: very fine grained subangular arkosic, 10YR 6/4, some outlining of cross beds with carbonaceous material 0.49 .26 0.41 Siltstone lens: fissile, with some clay .08 Sandstone: as at 0.49, with layer of carbonaceous material, irregular basal contact. This is base of a sandstone lens extending upward to above 1 m 0.31 .1 0.22 Mudstone: fissile, chippy, 5Y 5/2 with plant fragments .09 0.18 Mudstone: grading upward to dark grey fissile shale through this interval .04 0.16 Mudstone: friable 5GY 6/1 .02 0.02 Sandstone; very fine grained, massive, 5Y 7/2 with limonite mottling and plant fragments .14 0 Mudstone: massive, 10YR 6/2 .02 Base of Section