We visited one of the two huge craters on Green Side next to Sheffield Pike. It turns out that they are not quarries but are the result of a massive underground collapse in 1862. W T Shaw's Mining in the Lake Counties implies that it was due to miners taking lead out of two parallel vertical veins that left a plug of rock suspended. It duly collapsed one Sunday, so no one was hurt. https://en.wikipedia.org/wiki/Greenside_Mine has more details and an excellent photograph. The event was called the Big Crush. I spent the day thinking it was the Big Crunch. When I started teaching, it was expected that there was enough mass in the Universe to make slow and eventually reverse the expansion of the Big Bang, resulting in the Big Crunch . The 1999 evidence from Type 1a supernovae shows that the Universe is undergoing accelerated expansion so the Big Crunch is not going to happen.
