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addaword.gifdefinition of stratigraphy

noun
the study of rock layers in order to understand the geological history of the rock
The combination of sedimentology and stratigraphy allows us to build up pictures of the Earth's surface at different times in different places and relate them to each other.
Submitted from United Kingdom on 19/06/2013 12:07:00
Definition of stratigraphy from the Open Dictionary – a public resource hosted by Macmillan English Dictionary Online

emoji

a small digital image … which is used in electronic communication to express emotion or other simple concepts

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