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On a larger scale, even between continents, fossil evidence can help in correlating rock layers.
The Law of Superposition, which states that in an undisturbed horizontal sequence of rocks, the oldest rock layers will be on the bottom, with successively younger rocks on top of these, helps geologists correlate rock layers around the world.
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Objects having similar features are classified under one category.
In reading earth history, these layers would be "read" from bottom to top or oldest to most recent.
By matching partial sequences, the truly oldest layers with fossils can be worked out.From the make of these artifacts, it is possible to identify the time period during which they were made. These proteins are in turn composed of amino acids.Proteins termed as enantiomers are either D-right or L-left which indicates that they are rotating in either left or right direction.The study and comparison of exposed rock layers or strata in various parts of the earth led scientists in the early 19th century to propose that the rock layers could be correlated from place to place.Locally, physical characteristics of rocks can be compared and correlated.