roznensis or the Mobridge fauna could have been wiped out in U.S. interior and, after Elk Butte, interior re- populated. Much of this possibility hinges on whether Mobridge is the best fauna except for Mo. Valley area. Must take Cenzdzen setup into consideration here. 7. Scaphites constrictus Sow., Cast Maastrichtian (Czie a Bculites) St. Colombe (Mzucho) D'Orb. Coll. no. 7194 [Send to France for casts.] Trace of fine ribbing v. U.S. (strong paired nodes Shoulders have been gouged flat in preperation, but umbilicus swell 4