7/6/95 10 Section just west of Twin Bridges Park - Twin Bridges Park top of exposure Calories Wst 1'-3" ledge Colesburg, Iowa 16' silt State Highway 3 (3-32 miles same L+G '72 layer Used to find this on L+G '72 4 1/2' cherty calcite and think it in their laminated Danforth top of Sherwood ± 24' Member (Chert sequence 3) silt 1s. V. Chert Almost 6 miles east of double chert Eolgewood, S.A.S. ledge Massive weathering laminated ± 20' s.s. some C3 and 1. Photo B+W Riffl Hill Mbs J Stewartville fm wavy millings crosswork pattern 3 1/2-2" laminae & thalassonoides base of berrow's road cut+ 15 Clayton intersection on Jureley Road cut & set County Rd X 2 1/4, little post Rd. starts at bridge over river & extends 1/2 mile up hill. Exposures on both sides of road. hoe. 57, leverson Gerk & Broadhead (1979) littlepost Roadcut. S T5 1/4, Sec. 25+NE 1/4 Sec. 36, T 92N, R 5 W. Dubuque Fm 33' 7"; with Maquoketa Fm contact above & Stewstrib