Cross cutting relationships used relative dating
The Permian through Jurassic stratigraphy of the Colorado Plateau area of southeastern Utah is a great example of Original Horizontality and the Law of Superposition, two important ideas used in relative dating.
These strata make up much of the famous prominent rock formations in widely spaced protected areas such as Capitol Reef National Park and Canyonlands National Park.
The most obvious feature of sedimentary rock is its layering.
Hutton viewed tilted strata as having been initially deposited horizontally, and then were subsequently deformed (tilted and folded) by the forces of Earth's internal heat engine.With this in mind geologist have long known that the deeper a sedimentary rock layer is the older it is, but how old?Although there might be some mineral differences due to the difference in source rock, most sedimentary rock deposited year after year look very similar to one another.Here is a lesson and accompanying resources for a year 11 GCSE Geology class.The topic covered was stratigraphy and relative dating, so we covered many key geological concepts including the principle of unifominitarianism, cross-cutting relationships, original horrzontality, and the principle of superposition.