In front of my wife's cottage up north there lay an Exfoliated rock in which I watched the process for a number of years.
"Over Prairie Trails"
Frederick Philip Grove
The whole surface of this gigantic drift showed again that "Exfoliated" appearance which I have described.
"Over Prairie Trails"
Frederick Philip Grove
Here the drift was about twenty feet wide, perfectly level and with an Exfoliated surface layer.
"Over Prairie Trails"
Frederick Philip Grove