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Earth Materials
Minerals | Rocks

Sedimentary Rocks
Sedimentary Structures

Primary sedimentary structures form during or shortly after deposition. Stratification (or layering) is the most characteristic structure in sedimentary rocks. Sediment deposition in water is always horizontal with the youngest layer on top. Each layer is unique in their color, texture and internal structure and provides information about the environmental conditions under which they were formed. Each layer can be read like pages in a “Geological History” book.

Clastic Sedimentary Rocks
Biogenic Sedimentary Rocks