Image from the Biodiversity Heritage Library.
Contributed by Yale Peabody Museum of Natural History.
| www.biodiversitylibrary.org
Transcription
5/15/95
Twin Bridges Park
Ca 6 miles west of
Colesburg, Iowa
State Highway 3 (3-5 miles N. Segment with St Hwy 38)
Trsd to find this on L+G '72 and think it is their
Dun earth, top of Sherwood double chert Member. (Chert sequence 3)
Almost 6 miles east of
Kalgewood. S.R.
Rifle Hill Mbrs
1. Photo B+W {of Stewartville Fm
& thalassonoides crosswork pattern
burrows
crosswork pattern base of road cut
15 Clayton intersection on Quinley Drve
County Rd X 21, littleport Rd / Starts at bridge over river & extends 3 mile up hill. Exposures on both sides of road.
hoe 57, heverson, Gerber & Broadhead (1979)
littleport Road cut. SE 1/4, Sec 25 & NE 1/4
Sec 36, T 92N, R 5W. Dubuque Fm 33'7"
with Maquoketa Fm contact above + Stewartville
top of exposure
1-3'
edges
16' wth some
lenses
6 1/2'
deluvial calastite
eliminated silt 1/2 v chert
+ 24'
8"
massive weather
pebbled
ls.
some CS and
wagne within
3 1/2-2" laminae