terminated to x-12m. To irregularly tabular, weathered gray to light gray with rusty stain: Lower half commonly forms blocky fracture ledge. Base/ 4. to 6." contains distinctive clay pellet-+, locally some cht+qtzt, conglomerate of brun worth clay + silty clay in gray (lite) ss matrix. Contains linguloid brachs, teeth, fish vertebrae, bone frags, nodules. Lingulids and scattered small clay pellets common throught lower 3 feet. (Sample Colo Spzs 55-1A) A-818# The lower 1' of this unit is laminated, has some black sh partings characteristically shot through with sand filled worm borings. The best 1 cyl is a local feature only. (Sample Colo Spzs 55-1B A-818#) 5) 1.2 Shale, black, fissile sandy, with lenses of fine gr. white ss, siltstone, and locally a basal ss, cql. ss as much as 0.5' thick. Shale is worm-worked, double vertical tubes + irreg burrows ||= bedding. Sample Colo Spzs 55-1c - the shale " " " " " " -1D - the cgl. 2