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They are mostly Devonian rocks deposited in the distal oceans in front of the Acadian Orogenic Belt...
https://opengeology.org/historicalgeology/case-studies/acadian-orogeny/
Here is a good image and some relevant information if you are interested...
https://www.museumoftheearth.org/ny-rocks/devonian-geology
a long, long period of time
about 380 Million Years :)
Woah! These people love rocks on a whole new level! I will give it a read for sure!
I sometimes forget that you are one of these people (who love rocks and geology in general)! Haha!
That is a pretty long, long time period! I can't even grasp the concept of so far back.