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This law of science tells us that dirt, mud, sand and other sediments are almost always deposited in horizontal layers.
But how do we know this evolutionary sequence of layers, one on top of the other, is accurate? Two laws, or principles of geology explain why rock layers are formed in this way.
are the preserved remains or traces of animals, plants, and other organisms from the remote past.
The totality of fossils, both discovered and undiscovered, and their placement in fossiliferous (fossil-containing) rock formations and sedimentary layers (strata) is known as the fossil record.
The study of fossils across geological time, how they were formed, and the evolutionary relationships between taxa (phylogeny) are some of the most important functions of the science of paleontology.
Such a preserved specimen is called a "fossil" if it is older than some minimum age, most often the arbitrary date of 10,000 years.