When we drove up to Breakneck on NY Route 9D, Mrs. BD said "We aren't going up that, are we? No, we cant be." I said "I think so, and that's just the beginning. There are three further higher peaks." The photo does not capture the drama of this only 1300' foot rockpile that begins at sea level on the shores of the majestic Hudson River.
The site was heavily quarried for granite in the 1800s, so not all of the cliffs etc are nature's but they might as well be.
The boulder fields are nature's gradual erosion of the stumps of the ancient snow-capped Appalachian mountain range which was formed when Africa bumped into northeast America. The ancient Appalachians were the foothills of the Atlas Mountains of north Africa. Strange to consider.