Question

stratigraphy definition

Answer 1

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Stratigraphy is a branch of geology concerned with the study of rock layers and layering. It is primarily used in the study of sedimentary and layered volcanic rocks. Stratigraphy has two related subfields: lithostratigraphy and biostratigraphy. 
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Answer 2

Stratigraphy

Explanation:

• Evolution of the planet Earth,both in the organic and inorganic sphere,through geologic time,has been the main concern of Stratigraphy.
• The estimation of geological time,both in relative and absolute terms,has  been a matter of prime concern for the Stratigraphers .
• Stratigraphy is concerned with the description of rock successions and their interpretation in terms of time scale.
• It also provides the basis  of historical geology, and its principles and methods have found application in  fields like petroleum geology and archaeology.