Measured By Ada Swineford; Whitehorse Sandstone,Sandstone, very fine-grained, friable, cross-bedded, red with large irregular white spots; contains a few thin (5 cm) calcareous sandstone lentils.,Sandstone, hard, calcareous, red; contains sand balls as much as 2.5 mm diameter,Dog Creek Shale,Siltstone, dolomitic and calcareous, white to red; lenticular,Clay shale, silty, dolomitic, blocky, brownish-red,Siltstone, dolomitic, white (5Y8/1) with discontinuous red streaks; microscope shows large chlorite flakes,Clay shale, silty, brownish-red,Siltstone, argillaceous, calcareous, thin-bedded, red mottled light gray; and 11-mm layer near base contains salt casts up to 9 mm in diameter on lower side,Clay shale, silty, blocky, dark red,Siltstone, [...]