MICHAEL LONG / SCIENCE PHOTO LIBRARY MICHAEL LONG / SCIENCE PHOTO LIBRARY
Sandstone, limestone and mudstone, illustration. Three types of rocks and their microscopic structure. At centre is a specimen of limestone, formed from the compaction of calcium-containing shells. At right is a similar type rock formation, showing lime mud with the outline of shells seen in the rock. At left is a sample of a sandstone, formed from the compaction of grains of sand (mostly quartz).
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