
Tuesday, July 21, 2015
Stratigraphy
Stratigraphy is a branch of geology which studies rock layers and layering (stratification). It is primarily used in the study of sedimentary and layered volcanic rocks. Stratigraphy includes two related subfields: lithologic stratigraphy or lithostratigraphy, and biologic stratigraphy or biostratigraphy.

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talk nineteen to the dozen
to speak rapidly and without stopping
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