What is the difference between relative and absolute dating techniques interracial singles dating sites
The age of the fossil must be determined so it can be compared to other fossil species from the same time period.
As these changes have occurred, organisms have evolved, and remnants of some have been preserved as fossils.
The same rock formation also contains a type of trilobite that was known to live 415 to 425 million years ago.
Since the rock formation contains both types of fossils the ago of the rock formation must be in the overlapping date range of 415 to 420 million years.
Scientists can use certain types of fossils referred to as index fossils to assist in relative dating via correlation.
Index fossils are fossils that are known to only occur within a very specific age range.
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A fossil can be studied to determine what kind of organism it represents, how the organism lived, and how it was preserved.