I just have a wonderful visit to the Bruce Pennisula in Ontario. What makes this place so nice is the Niagara Escarpment. This cliff that travels from Niagara Falls to Tobermory, and a bit beyond, is an amazing geologic structure. But what amazes me, is the dolostone on the top.
1) The dolostone consists of fossilized coral reef. This coral reef is then underlain by limestone. This formation is about 100 feet high, atleast. Now somehow this coral reef had to form, be about 30 to 50 feet thick and then fossilize in a 6000 year model. How is that possible?
2) Flowerpot Island, another nice place located off the shore of the Bruce Pennisula has a few sea caves. Strangely, one of the "fully formed" sea caves is located about 60 feet above current lake level. The "forming" sea caves are now at current lake level. Now current geologic models explain how over time, water will erode away the rock to form the caves. The currently forming caves is evidence of that. I'm wondering how the sea cave at the higher elevation could have been formed in a short time without destroying the majority of rock around it. As to the sea cave being so high, the level of the great lakes was greater a while ago. So there is a mainstream geologic answer to that question.
3) I saw a large geologic pothole on the escarpment. It was about 8 feet in diameter, 15 to 20 feet deep. How could such a thing form during a global flood?