Dolomite rock like most other climbs in Iowa. Very crumbly/brittle in areas. Most of the rock that is lower has a good possibility of being caked with mud so be prepared.
The river, when deep enough, allows for MWS (muddy water soloing). Be careful of the undercurrents though. Other wise this area would be best suited for trad.
The only way currently known is via boat. Drive in to Palisades and drive to the entrance of the main trail. Unload your equipment. The climbing area is directly across the river, The house at the top of the bluff with the copper colored roof is the marker, the climbing area is directly under that house. We believe the house belongs to the park (unsure though).
Paddle across the river, and anchor your boats or take a couple nuts or cams to anchor them to a wall.
This used to be called Rich Man Wall. When the river is lower you can access it from the other side of the river. Park at the Observatory, and then follow trails that head downstream and towards the river.
There is also a great crack near there, called Melissa because someone carved that name in the rock next to the crack.
There are a few other good places to climb on the other side of the river.