Coal the heat and pressure of deep burial causes the loss of water, methane and carbon dioxide and an increase in the proportion of carbon. Thus first lignite (also called "brown coal"), then sub-bituminous coal, bituminous coal, and lastly anthracite (also called "hard coal" or "black coal") may be formed. The wide, shallow seas of the Carboniferous Period provided ideal conditions for coal formation, although coal is known from most geological periods. The exception is the coal gap in the Permian–Triassic extinction event, where coal is rare. Coal is known from Precambrian strata, which predate land plants—this coal is presumed to
Brown Moss Shropshire Council is looking to introduce grazing as a way to manage the site. Brown Moss Brown Moss is a Site of Special Scientific Interest, Local Nature Reserve and important wetland area rich in wildlife close to Whitchurch, Shropshire. It is open to visitors and contains a number of self-guided walking trails. The name 'moss' derives from the local word for a peat bog. Located within of Whitchurch and to the east of the A41, Brown Moss covers an area of . It is thought that the area was used for peat cutting by the people of Whitchurch from the