Walking up to the sandstone outcrops above the Writing-On-Stone rodeo grounds was a chore, each step shorter than the last, each breath a rasp. And then I heard a camera firing and looked up.

Wenguang Duan, Baojiang Sun, Deng Pan, Tao Wang, Tiankui Guo, Zhiyuan Wang, Experimental study on fracture propagation of hydraulic fracturing for tight sandstone outcrop, Energy Exploration & ...