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Dating and correlating rock layers

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Geologists generally know the age of a rock by determining the age of the group of rocks, or formation, that it is found in.

The age of formations is marked on a geologic calendar known as the geologic time scale.

The first practical large-scale application of stratigraphy was by William Smith in the 1790s and early 19th century.

Smith, known as the "Father of English geology", created the first geologic map of England and first recognized the significance of strata or rock layering and the importance of fossil markers for correlating strata.

The Law of Superposition, which states that older layers will be deeper in a site than more recent layers, was the summary outcome of 'relative dating' as observed in geology from the 17th century to the early 20th century.

The regular order of occurrence of fossils in rock layers was discovered around 1800 by William Smith.

It is primarily used in the study of sedimentary and layered volcanic rocks.

Though relative dating can only determine the sequential order in which a series of events occurred, not when they occur, it remains a useful technique especially in radiometric dating.

Relative dating by biostratigraphy is the preferred method in paleontology, and is in some respects more accurate (Stanley, 167–69).

Absolute dating places events or rocks at a specific time.

If a geologist claims to be younger than his or her co-worker, that is a relative age.