GL102 Lecture Notes - Lecture 3: San Andreas Fault, Graben, Metamorphic Rock
Document Summary
Direction of dip roll a ball down a bedding surface, the compass direction in which the ball rolled would be the is the compass direction in which the angle of dip is measured. If you could direction of dip: the dip angle is always measured at a right angle to the strike - that is, perpendicular, a horizontal bedding plane has neither strike nor dip. to the strike line. Because the beds could dip away from the strike line in either of two possible directions, the general direction of dip is also specified. Yet the rock exposed in outcrops is generally brittle and shatters when struck with a hammer. The rock is not metamorphosed (most metamorphic rock is intensely folded because it is ductile under the high pressure and temperature environment of deep burial and tectonic stresses). Perhaps folding took place when the rock was buried at a moderate depth where higher temperature and confining pressure favor ductile behaviour.
