Red beds are strata of sedimentary rock that are red due to the presence of iron oxides. The layers are composed primarily of sandstone, siltstone, and shale. Many red beds were formed during the Jurassic and Triassicperiods. Red beds have economic significance since many of them contain reservoirs of petroleum and natural gas. For discussion regarding the term strata as used in geology, see stratum. ... Two types of sedimentary rock: limey shale overlaid by limestone. ... Iron oxide pigment There are a number of iron oxides: Iron oxides Iron(II) oxide or ferrous oxide (FeO) The black-coloured powder in particular can cause explosions as it readily ignites. ... Jump to: navigation, search Sandstone near Stadtroda, Germany Sandstone is an sedimentary rock composed mainly of feldspar and quartz and varies in colour (in a similar way to sand), through grey, yellow, red, and white. ... Categories: Stub | Sedimentary rocks ... Shale Shale is a fine-grained sedimentary rock whose original constituents were clays or muds. ... Jump to: navigation, search The Jurassic period is a major unit of the geologic timescale that extends from about 200 Ma (million years ago) at the end of the Triassic to 146 Ma at the beginning of the Cretaceous. ... Jump to: navigation, search The Triassic is a geologic period that extends from about 245 to 202 Ma (million years ago). ... In geology, a period or age is a time span of many millions of years that are assumed to have had similar characteristics. ... Jump to: navigation, search Nodding donkey pumping an oil well near Sarnia, Ontario, 2001 Petroleum (from Greek petr – rock and oleum – oil), crude oil, sometimes colloquially called black gold, is a thick, dark brown or greenish liquid. ... Jump to: navigation, search Natural gas (commonly refered to as gas in many countries, but note that this is also American and Canadian slang for gasoline) is a gaseous fossil fuel consisting primarily of methane. ...
In the upper beds occur the bituminous or Boghead shale of tiutun.
The general sequence begins with the Artinsk beds, sandy and marly or conglomeratic beds in close connection with the Carboniferous, overlain by the Kungur limestonet and dolomites; these are followed by red fresh-water sandstones, over which comes an important series of copper-bearing sandstones and conglomerates.
The German subdivisions of the Bunter are as follows;(i) Upper Buntsandslein, or Rot, mottled red and green mans and ~lays with occasional beds of shale, sandstone, gypsum, rocksaft md dolomite.
In the Vosges district, this subdivision of the Bunter is called the Grs des Vosges, or the Gre-s principal, which comprises: (1.) red micaceous and argillaceous sandstone; (ii.) the conglomirat principal; and (iii.) Grs bigarre principal (=grs des Vosges, properly so-called).
In Germany some of the harder beds have yielded building stones, which were much used in the middle ages in the construction of cathedrals and castles in southern Germany and on the Rhine.
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