Stratigraphy
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Stratigraphy (stră-tĭ-grăf'ē)
Stratigraphy (pronounced stră-tĭ-grăf'ē) is a branch of geology concerned with the study of rock layers (strata) and layering (stratification). It is primarily used in the study of sedimentary and layered volcanic rocks.
Etymology
The term "Stratigraphy" is derived from the Greek words "stratum" (a cover, bed) and "graphia" (description).
Related Terms
- Stratum: A layer of sedimentary rock or soil with internally consistent characteristics that distinguish it from other layers.
- Stratification: The layering that occurs in most sedimentary rocks and in those igneous rocks formed at the Earth's surface, as from volcanic lava flows and ash.
- Chronostratigraphy: The branch of stratigraphy that studies the age of rock strata in relation to time.
- Biostratigraphy: The branch of stratigraphy which focuses on correlating and assigning relative ages of rock strata by using the fossil assemblages contained within them.
- Sequence stratigraphy: A type of stratigraphy that deals with the sequence of deposition of sedimentary rocks.
- Magnetostratigraphy: A geophysical correlation technique used to date sedimentary and volcanic sequences.
See Also
External links
- Medical encyclopedia article on Stratigraphy
- Wikipedia's article - Stratigraphy
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