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Sandstone

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Siccar Point, eroded gently slopingDevonian Old Red Sandstone layers forming capping overconglomerate layer and older vertically beddedSilurian greywacke rocks.

Red sandstone

Sandstone is asedimentary rock. It is a rock made of compactedsand. Sand is small grains ofrocks andminerals (such asquartz andfeldspar). These are the most commonminerals in theEarth's crust.

Sandstone which is resistant toweathering is used for building in many countries. It can be a hard rock. For example, paving slabs can be made out of hard sandstone.

Sandstone is converted intoquartzite through heating and pressure. This happens when rocks are squeezed and heated under amountain chain.^[1]

Sandstone is most likely to be deposited from fast pacing water such as rivers.

Origin

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Sandstone forms in two stages. First, layers of sand build up assediment, either from water or from air (as in adesert).

Then sand particles are compacted by pressure of overlying deposits, and cemented ('glued' together).^[2] The 'cement' is eithercalcite (calcium carbonate),quartz (silica), orclay.Iron oxide often makes sandstone a reddish color.

Related pages

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Old Red Sandstone was laid down inmarine conditions. It is a sort of dirty dark red.Devonian period.
New Red Sandstone was laid down indesert conditions. It is a rock which is fairly bright orange-red in color.Permian period.

Notes

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↑Metamorphic rock is formed bytectonic compression inorogenic belts.
↑Thegeological word for this is 'cementation'.

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Sandstones

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