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Making this processes even more difficult is the fact that due to plate tectonics some rock layers have been uplifted into mountains and eroded while others have subsided to form basins and be buried by younger sediments.

With out individual time stamps the process of dating these structures could become extremely difficult.

As a result, it was difficult to chronologically compare fossils from different parts of the world.

However, relative methods are , which is that if there are layers of deposits, those laid down first will be on the bottom and those laid down last will be on the top. However, geological strata are not always found to be in a neat chronological order.

The most obvious feature of sedimentary rock is its layering.This feature is produced by changes in deposition over time.With this in mind geologist have long known that the deeper a sedimentary rock layer is the older it is, but how old?Wind and water erode strata and some areas are uplifted or even tilted.These processes result in All of these processes confuse the stratigraphic record.

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