0.4 Claystone light gray, weather white 0.2 Ferroginous clstn, rusty, full of Fe specs. 1.3 Claystone, locally silty, gray with yellowish cast Fe specks not prominent, chiefly empty holes. 0.3t Ferroginous clstn, 0 to ½ Fe specks 1.0-? Claystone, variegated red, light gray and purple, Fe specks in upper foot (only part seen) give yellow stain. W-25 Left-hand Creek, Missouri Bluffs Quad. Bluff north road in center S½ NE¼ Sec. 18, T 53 N, R 66 W. (Morrison - Lakota contact + base) Morrison here Bluff capped locally by Fe induced remains cause like gray chert pebble cyl. Under this is 22 feet of medium to fine gr., X bedded to tabular X-lam sandstone which is locally shaly at top. Some of laminzation is type. Most 26.