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5 Key Principles of Relative Dating in Geology
Relative Ages of Rocks | Earth Science
Figure 1. Grand Canyon National Park preserves an iconic geologic landscape and resources ranging from 1, to million years old, including diverse paleontological resources; unconsolidated surface deposits; a complex tectonic and erosion history; and Pliocene to Holocene volcanic deposits. The Colorado River established its course through the canyon about six million years ago, and likely evolved from pre-existing drainages to its current course. Geologic processes, including erosion of tributaries and slopes, and active tectonics continue to shape the canyon today. The geologic record in Grand Canyon is an important scientific chronicle and is largely responsible for its inspirational scenery. Well known for its geologic significance, the Grand Canyon is one of the most studied geologic landscapes in the world. It offers an excellent record of three of the four eras of geological time, a rich and diverse fossil record, a vast array of geologic features and rock types, and numerous caves containing extensive and significant geological, paleontological, archeological and biological resources.
Module 9 Assignment
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What are the relative ages of these rocks? This photo shows rock layers and a fault—the fault is the large diagonal crack running through this rock. These features can tell us several things about relative age.