Calcite with Marcasite Inclusions found at site. Sounds like a fancy name for Kryptonite?
Another site claims, "The rock is here well bedded (see Illustration sheet 1, fig. 16) and shows abundant traces of organisms. The strata form a gentle anticline with northeast-southwest strike, and the surface shows glaciation. Some dimension stone is quarried." What "organisms," it never says.
Yet another site offers views of the "quarry." Curiously, none of the camera's work.
Suburban teens make it their business to break into places like this. I've never met a single person that has seen the inside.
Open your eyes people.