GeoClassroom Physical Geology Historical Geology Structure Lab

Physical Geology


Sedimentary Rocks

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- sed rx are those which form by lithification of unconsolidated sediments.

- lithification is a process of compaction

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Silicate clastics:

- derived from the weathering of other material.
- or pieces of broken material glued together
- formed from deposition and lithification of these in rivers, lakes, streams, etc.
- grain size indicates energy level - how fast the water was moving.

Biogenic Sediments:

- formed by the accumulation of living critters

Chemical Sedimentary Rx:

- formed by inorganic precipitation of dissolved material in water.
- tend to have a smooth (crystalline) texturem not clastic (things glued together).
- formed by changes in the chemistry of an environment (temp, press, etc.)

-Sedimentary rx have several unique features:


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