I love Central Park and pay at least a quick visit every time I get to NYC. I could never understand why it has all those rocky outcrops all over the place.But a year or two ago I stumbled upon a website that says that those outcrops (I forget what they’re officially called) represent irrefutable proof that that little spot of land now known as “Central Park” was,a few thousand years ago,enveloped in a glacier about a half mile thick.
The rocks have long gooves - glacial striations - cut into them when the glaciers dragged debris across the bedrock.