Note 12 — THE GEOLOGY OF MT. PHILO STATE FOREST PARK
Reading edition
According to the basic geologic law, the Law of Superposition, younger rocks (those deposited last) are always found resting on older rocks (those deposited before the younger). The only time that this is not true is when either breaks (faults) or folds in the earth’s crust place the layers in an inverted order, as in the case here cited.