90 6/29/98. Took US 52 north from Decorah. then a west dirt road (Bluffton Rd.) 1. East side of Upper Iowa R on Bluffton shortcut (dirt road) & 1 mile east of Bluffton. - 1 photo Bridge to Bluffton closed due to high water. There are good exposures on road down to river 91 Iowa, ca 14 miles North of Decorah 2. X on west side of US 52 at Burr Oak Rd. NW cnt US 52. See Sloan edit. (1987) p. 211 strat section of Dubuque Fm. We think we are looking at Hittleport, Luana, Frankville beds & prob. top of Stewartville Fm. (Top down listing of units.)