I had to laugh. Great story. I am reminded of my college days. I was enrolled in a Geology class, and we took a field trip to the Wisconsin Dells. Our professor, Dr. DeVries (a wonderful teacher!) Had us view the layers of stone and sediment that were clearly visible along the banks of the Wisconsin River--sandstone, limestone, shale, more sandstone, sedimentary, limestone, more shale, etc., etc.
We all duly noted these layers in our notebooks, and then he told us the only reason the coal companies had not strip-mined the area for the shale deposits was because the state had forbidden them to do so, as the area was protected as a state park. Therefore, we were able to view the area in its more of less pristine state.
Finally, he said the coal companies, denied the ability to do the strip mining, were unable to sing their favorite hymn, -- (are you ready?) -- "Shale We Gather by the River"
<drum rimshot & cymbal crash>