Stratigraphy, a branch of geology, is basically the study of rock layers and layering (stratification). It is primarily used in the study of sedimentary and layered volcanic rocks. The subject was essentially invented and first rigorously applied by William Smith in England in the 1790s and early 1800s. Smith, known as the Father of English Geology, created the first geologic map of England and first recognized the significance of strata or rock layering.
Stratigraphy includes two related subfields: lithologic or lithostratigraphy and biologic stratigraphy or biostratigraphy.

Bedform Sedimentology - Contains information about sedimentary structures with explanatory text, computer-generated images and movies, photographs, and bedform-simulation software. From the USGS.
Meta Description: [ Information about ripples, dunes, and sedimentary structures including, explanatory text, computer-generated images and movies, photographs, and bedform-simulation software. ]
Web Resources for Sedimentary Geologists - Directory of sedimentology and stratigraphy web resources, maintained by Geological Society of America's Sedimentary Geology Division.
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