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Summary:
Sandstone consists of sand grains between 0.02 and 2mm in diameter that have been cemented together. It may contain obvious layers (bedding) or lines at angles to the layers (cross-bedding). Sandstone forms in a range of environments such as rivers, deserts and marine. Quartz forms about 65% of the detrital fraction of the average sandstone, and feldspars about 10 to 15%. The mineral composition of the sandstone can be used to determine the character of the source rock. The cement usually imparts the colour of the sandstone.
Recommended sites:
Haslingden, NE Lancashire ( a classic sandstone that was used (I am led to believe) to flag Trafalgar Square, London. Outcrops (though weakly) in the Cliviger Valley.
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