In the mining districts of mountainous regions the ore-bearing belts are quite often coincident with fault planes. These planes are not usually clean-cut, single slipping surfaces, but consist of a number of gliding faces distinct from one another, sometimes branching, sometimes crossing at low angles, and contain in their immediate neighborhood more or less brecciated material. This compound character of what we are prone to pass over as single, simple dislocation, is found, after a little careful examination, to prevail in the majority of cases.
Proceedings of the Iowa Academy of Sciences
©1899 Iowa Academy of Science, Inc.
Keyes, Charles R.
"Genesis of Normal Compound, and Normal Horizontal Faulting,"
Proceedings of the Iowa Academy of Science, 7(1), 112-113.
Available at: https://scholarworks.uni.edu/pias/vol7/iss1/15