Joint Sets

Jointed Jurassic strata in Arches National Park, UT. The dominant joint set is oriented left-right. A secondary joint set is oriented at right angles to the dominant set. Photo credit: Louis J. Maher, Jr. Image from website: http://www.geology.wisc.edu/~maher/air/air00.htm
Jointed strata at Arches National Park, UT. Note that at least two joint sets are present. Photo credit: Louis J. Maher, Jr. Image from website: http://www.geology.wisc.edu/~maher/air/air00.htm
Looking down on vertical joints at Arches National Park, UT. Gaping joint set is aligned from lower left to upper right. Photo credit: Louis J. Maher, Jr. Image from website: http://www.geology.wisc.edu/~maher/air/air00.htm