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So, you can't date the fossils in absolute terms but you can get a relative age compared to the other layers.

If you happen to know the age of one of the fossils is one layer (by some other dating mechanism) you can then make some educated guesses at the actual age of the other layers, and the fossils in them.

The study of fossils is the domain of paleontology.

The development of radiometric dating techniques in the early 20th century allowed geologists to determine the numerical or "absolute" age of the various strata and thereby the included fossils.

Like extant organisms, fossils vary in size from microscopic, even single bacterial cells one micrometer in diameter, to gigantic, such as dinosaurs and trees many meters long and weighing many tons.

A sedimentary deposit is layer upon layer of mud or other fine particulate that eventually turns to rock. In some places on the Earth these sedimentary deposits have been uncovered in such a way that you can see dozens of layers stacked one on top of the other.

The concept in relative fossil dating is that the fossils on the bottom layer are the oldest and the fossils in the top layer are the youngest.

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