Ok, here's a picture of my most recent rock. it's the bedrock behind the Troy Middle School track, New York State, North America. Transition zone between blobby limestone and flaky shale. All from deep in the ancient Iapetus Ocean before it got smushed closed 440 million years ago during the Taconic Orogeny (mountain building).
https://en.wikipedia.org/wiki/Taconic_orogeny
There is a story embedded in this rock, but I'm not sure what it is! When did the limestone get laid down? When the shale? When did they get smashed together like that? During an earthquake that tumbled the limey ooze and clay mud together higgledy piggledy under the ocean or afterwards when they turned to stone and got shoved up on top of our continent? Mysteries recorded in the rock.
