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Coconino Sandstone in Grand Canyon looks similar to the 160 m.y Navajo Sandstone in southern Utah) [see Photos 6a&b].Lithology is also a poor basis for correlation because different rock types can be deposited at the same time in adjacent areas because of different environments.

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A good collection of index fossils in a rock layer allows a very precise assignment of relative age.

An “index fossil” in the realm of clothing fashion could be polyester leisure suits – they were widespread, and thankfully, only around for a brief time.

Grand Canyon contains many important geologic resources, including a vast fossil record ranging from Precambrian stromatolites to Ice Age mammal bones and dung found in caves; a potentially active volcanic field in the western Grand Canyon; a geologic history ranging more than 1.7 billion years; and the canyon landscape itself as the greatest example of arid land erosion.

There are two major categories of geologic dating techniques: relative dating and absolute age determinations .

Someone looking at a photograph with men dressed in leisure suits would be able to correlate that photo to others of the same time period in which men are wearing leisure suits.

Last modified 17-Sep-2015 22:58