You examine a geologic map of the state of West Virginia and see a fold which is cored by old rock and flanked by younger rocks. True or False. Because the outer core is deep within the earth and under a lot of pressure, most earthquakes originate there. Strike slip faults involve primarily dip-slip movement. Thrust faults and reverse faults generally place older rocks on top of younger rocks.
Normal faults tend to produce repeated sequences of sedimentary rocks.
As volcanic rocks cool, they acquire the orientation of the Earth's magnetic field. Unconformities are very important surfaces because they represent geologic time during which there is no preserved rock record. The Principle of crosscutting relationships is based on the obvious fact that a rock must first exist before anything can happen to it. A dinosaur footprint in sandstone is a good example of a trace fossil. The principle of superposition states that rocks are deposited horizontally.