Great rock-hounding trip to Minnesota/Iowa/Wisconsin. I even had to give a basic geology lesson to the TSA in Minneapolis as to why I have rock samples that are so "sandy." LOL!
I visited:
Minnehaha Falls in Minneapolis, MN: https://sites.google.com/view/briancraigsteinberg/rock-hounding/minnehaha-falls-minneapolis-mn?authuser=0
The famous St. Peters Sandstone in Rochester, MN: https://sites.google.com/view/briancraigsteinberg/rock-hounding/66-st-peters-sandstone-rochester-mn?authuser=0
Platteville Limestone in Decorah, IA (Luther College): https://sites.google.com/view/briancraigsteinberg/rock-hounding/68-plateville-limestonedolomite-decorah-ia-luther-college-campus
Also, the famous Decorah, IA Meteor Impact Crater: https://visitdecorah.com/decorah-impact-crater/#decorah-impact-crater and a 6 foot Eurypterid fossil: https://visitdecorah.com/decorah-impact-crater/#Sea-Scorpion
Mazomanie Sandstone in Hudson, WI: https://sites.google.com/view/briancraigsteinberg/rock-hounding/67-mazomanie-sandstone-hudson-wi