See p. 26 Sloan. Fig. 4.1-Shaley late that is greenish. Notes: Good road sections S. of Gutenberg of Ord. and Siln. C/X- road section at 5 miles west of Garber. 1/2 mile from X41 intersection and 2 miles east of Garber. Stop 15 in 1995 field book. Near Littleport, Clayton County, Iowa. County Road X21. 3 photos- 1 at bottom (Frankville Mbr.), 1 at top (Littleport Mbr.) and 1 in the middle (Luana Mbr.). Maquoketa FM. - shale atv. top 6/23/98 Twin Bridges Park. Stop 16 in 1995 field book. 3 photos. Section on west side of roadcut ca. 6 miles west of Colesburg, Iowa on Iowa 3. 6/24/98 Location 17 in 1995 field notes. 1/4 mile south of Graf on W side of road. 1 photo. Took Asbury Rd. from Dubuque which became D 17 and then turned south to Graf on side road. Section is becoming overgrown. Just west of Twin Springs River. (see Witzke and Glonister, '87, p. 105) 17-B 1/2 mile east of intersection of D17 and turn off road to Graf on D 17. 3 photos of NE roadcut on D17. 6/24/98 Photo of 5/16/95 #21 of Tschiggfrie quarry.east of US 52 about 1 to 1/2 miles south of junction with US 61; photo from southern entrance to quarry off of Olde Maxsey Road. There are several roadcuts between the junction of US 20 and US 52 South, one of which shows a nice bedding break which probably a bentonite. Also along US 20 there are some impressive roadcuts of the Dubuque Fm. SEE 18 Becker quarry. 1 photo.