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Sedimentary Rocks


Sandstone


"Colour: Very variable; frequently red, brown, greenish, yellow, grey, white.

Texture: Medium-grained. Usually well sorted, that is grains all about the same size; grains sub angular to rounded (sandstone).

Structure: Bedding usually apparent; current bedding and ripple marks common; graded bedding may occur. Concretions and fossils may be found.

Mineralogy: Quartz is the main component but is often accompanied by feldspar, mica or other minerals. The grains may be cemented by silica, calcite or iron oxides.

Field relations: Sandstones are associated with most other sedimentary rocks. Most sands accumulated either in water, usually the sea, or as wind-blown deposits in arid continental areas. Desert sandstones tend to be red, and the individual sand grains are often almost spherical and polished."

(Hamilton et al 1976, 194)


Common Sedimentary Rocks:
Breccia
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Sandstone
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Dolomite
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Rock types:
Igneous Rocks
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Sedimentary Rocks
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Metamorphic Rocks
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