As a student of the earth sciences, I am newborn. Could rock formations such as these underlie portions of Fennimore county? Your guess may be better than mine. In that likelihood, I welcome a conversation about the potential geological underpinnings of Agincourt with anyone inclined.
This image, by the way, was taken near Mason City in the north central part of the state. Anson Tennant’s maternal grandfather lives near Mason City, incidentally, so he might have encountered the Prairie School works of Wright, Walter Burley Griffin, William Drummond and a few lesser lights there.