South Mountain Joints
Cooling joints in mid-Tertiary granite
Joints strike NNW and dip steeply to the east
Most common orientation is 335°, 73°E
Joints formed in an extensional environment with ?3 horizontal and ENE
Smaller hydrofractures also strike NNW and reflect the ENE orientation of ?3
n = 60; mode = 335?, 73?E; pole = 245?, 17?SW