We came across this hole in the woods the other day. It is along an ancient stream bed (not far from a current creek). Three holes near to each other. The other two are mostly filled in with trees growing out of them. This hole is 4-5 feet in diametre and 8 feet deep on the low side and 12 deep on the hill side. If one looks closely, treatment the erosion marks form rings or scrapings in the rock. I assume that this was created by water swirling debris and eventually boring through the rock. The bottom is filled with leaves and the top of a snapping turtle shell is visible. With a hole like this, I would think there would be remains of more animals. If a human were to fall into this hole, I believe one would need some climbing skills to get out and the top edges offer little handholds. I will venture back to this place and check it out more closely soon.