How can the order in which geologic events occur be determined?
1. The bottom layer of a series of sedimentary layers is the oldest, unless the series has been overturned or older rock has been thrust over it. (Law of Superposition) Be able to determine the order to events in a model of undisturbed sedimentary layers. 2. Rock layers are older than igneous intrusions, which cut through them or igneous flows which, are above them. Contact metamorphism provides additional evidence that the contact rock must be older. 3. Rock layers are older than faults and folds found in them. Rocks must exist before they can be folded or faulted. B. How can rock and geologic events in one place be matched with other locations? 1. Rock layers can sometimes be followed from one location to another by “walking the outcrop”. Which means physically following the layers from one place to another. This technique is only applicable when outcrops are located close or separated by a short distance. 2. Rocks can sometimes be correlated on the basis of similar rock types or sim
