Locality 40. At south end of bluff typical Hell Creek exposure but big sands lacking. Very difficult to tie in with Loc. 75. Oyster bed at base of S end of bluff with lig shale under it. High in bluff to N, is sand (possibly 11+12 below) with Colgate-like convolutions. Skeleton Section. (1) 3.-? Popcorn surface on deeply weathered grey clay. (2) 7.0 Reddish weathered lig shale and clay. (3) 7.0 Sandy, firm, with oyster beds in lenses throughout; upper one at top is locally 0.8 conc'd ss layer with oysters, zoophites, corbicula etc. Sand is x (2ur to x bedded). (4) 5.2 Sandy, massive to x layered, weathered like gray fluted; at top white weathered sand layer 0.5+ with OB weathered cone masses. (5) 12.5 Sand as below (4) with clayey lig shale layers 4-1.0 from base to 6.0 from base upper few feet jarositic. (6) 5.8 Clay, lower 1.0 to 1.5 liquid crumbly cledge; above is dk gray hard clay becoming lighter upward. 1.0 at at top + OB weathered crumbly cones Festone and accumulated bones- very plentiful here. (7) 17.5 Silty clay + clayey silt weathered to popcorn slope with scattering of fo stone cones weathered crumbly OB. Lower 3.0+ 45