There probably cover all interval between base of sample 10 and the cone layer. Sample G-491-C-13 is from 18" shale directly over cone layer nearest gully W. G-491-C (continuation from cone layer down) Cone layer is 6-10" thick large limestone shaley at top. Ammonites in top of layer - long, weather out - fragmental, usually crushed. usual cone in cone at top, some stem frags + calc-nodules 4 to 6 Gray shale 8 to 10 Bentonite & Bentonic shales 35 Gray somewhat weathered) shales 1" Bentonic streak at base Sample G-491-C-14 71 Dark gray clay shale Sample G491-C-15-A and 15-B 6 Bentonite 0 to 4 Platy, silty limestone, plant frags 41 Black shale Sample G-491-C-16 (continuation) 2 Bentonite 12 Block shale (included in sample above) 1 Bentonite 27 Dark gray shale rusty streaks 6" from top and 8" below base (Sample 491-C-17)