relative dating 2.jpg

Some religious writers believed that the shells were washed up during the Biblical flood. The original description page was here. The Proterozoic rocks of the Grand Canyon Group have been tilted and then eroded to a flat surface prior to deposition of the younger Paleozoic rocks. Steno discovered the rules for determining the relative age of rock beds, but he did not have a good understanding of how long it would take for these rock formations to form. To determine the sequence of geologic events, several principles must be followed. A second clue could be the presence of a key bed , or a particularly distinctive layer of rock that can be recognized across a large area. For example, if an igneous intrusion goes through a series of metamorphic rocks, the intrusion must be younger than the metamorphic rocks that it cuts through Figure

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