4. Dakota - Benton - approx on vegetation transition zone (top.) 5. Base limestone in Niobrara Green lines, W. to E. 1. Second Glencziru clay. 2. First Glencziru clay +/- split. 3 Higher clay - may be mid-Dakota. Lytle - highly variable, locally congloom., base not exactly located. For most part obscured by slope wash. Most complete section is Morrison section (10). See also section given AIN-50-21, 10. Lytle-Glencziru contact, sharp, chiefly SSau ss. Black shale (Glencziru 4) not present, 3rd Glencairu sand thins southward (Cf. AIN-50-21, 8, and section 10(Morrison)) The 3rd ss consists of upper even-bedded part and lower massive x bedded part. Where 4th shale present at Alameda cut & vicinity it comes between these 2 beds, :: lower massive part probably = 4th Glencziru.ss. 3rd glencziru shale- typically sandy; contains usual 2 bentonites. Actually more ss than shale in this area. No shale beds worthy of note. 2nd Glencziru sand. - A massive silty, soft lite gray sand with some shaly partings, throught hogbacks. Upper bed of 2 to 4' more resistant, brown weathering, is only ledge former. 2nd Glencziru shale. Persistent zone with porcellinite-like layer near top except where latter cut out by canneling. This only clay bed that reaches mineable thickness in the hog back. (See AIN-50-21, 11.) May be 22