Old Red Sandstone

Bol

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Old Red Sandstone describes a suite of sandstone rocks deposited in a variety of environments during the Devonian period but extending back into the late Silurian period and forward into the earliest part of the Carboniferous period. The body of rock, or facies, is dominated by alluvial sediments and conglomerates at its base, and progresses to a combination of dunes, lakes and river sediments. The familiar red colour of these rocks arises from the presence of iron oxide but not all the Old Red Sandstone is red or sandstone - the sequence also includes conglomerates, mudstones, siltstones and thin limestones and colours can range from grey and green through red to purple. These deposits are closely associated with the erosion of the Caledonian Mountain chain which was thrown up by the collision of the former continents of East Avalonia, Baltica and Laurentia to form the Old Red Sandstone Continent- an event known as the Caledonian Orogeny.

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Pagina's: 124, Paperback, Betascript Publishers