Topic: sandstone

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sandstone

The Columbia Encyclopedia, Sixth Edition
sandstone sedimentary rock formed by the cementing together of grains of sand. The usual cementing material in sandstone is calcium carbonate, iron oxides, or silica, and the hardness of sandstone varies according to the character of the cementing material; quartz sandstones cemented with quartz are the hardest. Sandstones are commonly gray, buff, red, or brown although green and some other colors are also found. Green sandstones often contain, in addition to sand and glauconite, fossil shells and iron oxides; those that break apart easily are known as greensands and are sometimes used to... Read more
Old Red Sandstone
The Columbia Encyclopedia, Sixth Edition series of red and brown sandstones, conglomerates, and shales deposited ... period of geologic time. The Old Red Sandstone, in contrast to the typical formations ... the Devonian fishes. The Old Red Sandstone was correlated with the marine Devonian ... Read more
old red sandstone
World Encyclopedia old red sandstone Geological term for freshwater deposits of the Devonian period found in Britain. These strata are noted for their fish fossils among which are jawless fishes (ostracoderms), the first jawed fishes (placoderms), and the first true bony fishes (osteichthyes). Read more

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Sandstone - America