- 2 - SECTION 8211 continued UNIT Lance Formation Thickness 1.18 Siltstone: limonite staining on joints, carbonaceous fragments, root casts. .07 Lens of sandstone and siltstone. Sandstone: very fine grained, silty, with vertical root casts, grading downward below 1.0 m into a siltstone, 5Y 7/2, with brown laminae and vertical root casts. 1.1 - 1.2 color 5Y 6/4 .3 0.8 Siltstone; fissile, 5Y 5/6, with root casts .08 0.75 Clay: silty, fissile .05 0.69 Mudstone: fissile, carbonaceous, 5Y 6/2 .06 Sandstone: in small channel base dipping N, very fine-grained subrounded, disturbed bedding, clayey, with limonite staining at base, and wood fragments. 0.46 .13 0.3 Siltstone: fissile, becomes massive, some gypsum .16 0.23 Shale: becomes massive, limonite staining still present .07 0.12 Shale: fissile, 5Y 6/2 .11 0.08 Shale: grading upwards to siltstone, 5Y 5/2 with root casts, some limonite staining. .04 0 Shale: fissile, 5Y 6/2 with rare vertical root casts. .08 Base of section