Relston Reservoir section Est. 12.5 Use equation (y) [23' = slope distance, slope angle = 25\degree N 70\degree W = Azimuth measurement Dip of beds 55\degree E, Strike N 5 W Billings plot] Upper 2' typical transition platy lite gray weather siltstone. Remains buff to light gray weather, fine gr, ss with silty shaly partings in upper part near base 4.6 Sandstone, even bedded, x bedded medium some fine gr. wed thick bedded with intraform crl and plat frags. Frags white weather silky clastone. Much rip, marking on bed surfaces. Weather buff. 13.0 As above with less if crl and thicker beds. Weather's buff 2.6 Shale, gray to black-- Upper 2.0), Gray to dk gray clay, silty in upper part. About .025 bentonite at base .4 highly carbonaceous silty clay, about .1 bentonite at base .2 boney clay 3.6 Fine grained, locally argillaceous ss. some shaly pgs between beds .4 to 1.0 Silty + sandy clay (shale) 9.