Image from the Biodiversity Heritage Library.
Contributed by Yale Peabody Museum of Natural History.
| www.biodiversitylibrary.org
Transcription
6/22/98 - Road on north side of US 20 ( miles west of Dubuque, Iowa -- see below
It is immediately (1/2 mile) east of Bassington Drive (hates)
Higher on hill, Note: & Cheaty xx
2.5 miles west of intersection of US 20 with US 32/
& gray siltstone & clayst.
6b
and south side (Photo)
Thurice Witzke and Glennister, '87, US 20 Rd Cut
1 photo
conglomerate phosphorite below columnal,
corgos, & brechs. llas, red ooids 'Nada'
greanish gray siltstone
& cement yellow siltst.
Silurien
21'
Col. 6/22/98-B
Dz. with Crinoid Columnals & delicate
corgos 3or4 but 2" thick each
a
silty
shales
phosphates
Collection 6/22/98A
a few 2" yellow brown siltstone bands
banded siltstone 2"-6" color bands
with phosphite & iron oxide
& phosphorite)
low armoxide modules,
lt gray brown silstone
Brainerd
15'
21'