In reply to C Witter:
I grew up in the area, there are a good number of disused quarries around, and quite a few still being worked (Back Lane, Holme Park, and Sandside). This one around the corner from Trowbarrow is enormous, and seems to be permanently dry:
https://goo.gl/maps/JDSsVtNzA5s
As someone said above, modern blasting techniques seem to fracture the rock more - broadly speaking, you're quarrying for gravel to make concrete and roads, not for masonry stone, so the more fractured you can make rock as it comes down, the less crushing and processing you have to do. The result is very loose and fractured rock left behind.