New York City has some cool geology: Paleozoic metamorphics scraped by Pleistocene glaciers.
Filed under: geology, glacial landforms, metamorphism, new york, nyc, paleozoic, pleistocene
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Mountain Beltway by Callan Bentley is licensed under a Creative Commons Attribution-Noncommercial- Share Alike 3.0 United States License. That means you can use the stuff you find here, repost it with attribution to the author, and "remix" it for your own purposes, but not with the aim of making money off of it.
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Callan Bentley
If you accept that ice is technically a mineral (and it is), that would make glaciers enormous rocks, and the above a form of slickensides.