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    Stratigraphic column dating

    Other important subdisciplines include geochronology, the study of Earth's age and the dating of specific formations in terms of geologic time; sedimentology, the study and interpretation of sediments, including sedimentary processes and formations; paleontology, the study of fossilized plants and animals; and paleoecology, the study of the relationship between prehistoric plants and animals and their environments.

    Several of these subjects are examined in other essays within this book.

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

    It is primarily used in the study of sedimentary and layered volcanic rocks.From the beginning of this course, we have stated that the Earth is about 4.6 billion years old.How do we know this and how do we know the ages of other events in Earth history?Stratigraphy is the study of rock layers (strata) deposited in the earth.It is one of the most challenging of geologic subdisciplines, comparable to an exacting form of detective work, yet it is also one of the most important branches of study in the geologic sciences.

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