Michigan? Pothole EarthCache

Yes this is private property just come on in.  Three EarthCaches and a few geocaches.

More than 10,000 years ago the glaciers of the ice age were instrumental in the forming of "potholes" as glacial melt waters produced large volumes of flowing water for many years, contributing to the formations in the different types of rock. Common geological rock classifications in this area are sandstone, shale, and coal, but the more often seen are the Erratic’s.  They are rock of diffrent types that have been broken free by glaciers and carried great distance. In the warm summers great cascades of melt water, bearing tons of gravel, sand, and boulders, spilled over the edge of the ice sheet or down through a crevasse within the glacier. Finding its way to the bedrock, the deluge of water swirled the abrasive material it carried around and around, hollowing out potholes in the bedrock. What you will find here is a piece of bedrock that that has been broken away and carried off after a pothole had formed in the flatter suffice that you see.

To get credit email me the answers to these questions.

1) Two measurements; how deep is this pothole and what is the diameter of the opening?

2) Hands on; feel the inside walls of this pothole and the very bottom. How would you describe the texture of the inner walls and the shape of the bottom? What shape is  the inner wall ? (long, shallow, round, square, even, uneven?)

3) Can any striation marks be observed on this rock from when the glacier moved over the bedrock?