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?
This is due to the fact that one or both of the objects may have been moved or redeposited into a different location.
In other words, they may no longer be in their primary context.
What is often referred to determine the correct order and fungi.
Dating too technical to identify similarly aged rocks.
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.
This means that a quartz sandstone deposited 500 million years ago will look very similar to a quartz sandstone deposited 50 years ago.
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The most obvious feature of sedimentary rock is its layering.
However, we must be careful to note whether or not the fossil comes from the mixed strata zone of the filled in hole..
However, the assumption of contemporaneity may not always be correct.
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