Dean, Forest

Whereas in some British pits there is practically no silica associated with the coal seam, those in Somerset and Dean Forest (Gloucestershire) include Pennant rock, a highly siliceous sandstone (Meik-LEjOHN 1960). Hart and Aslett (1942) concluded that the incidence of pneumoconiosis was somehow related to the hardness or rank of coal. Thus the disease was more present in the anthracite (hard--high rank) than in the bituminous or steam coal (soft-low rank) pits. 

In the investigation of a number of cases of fatal poisoning attributed to wall coverings, the evidence has led to the plaster as being the source of the trouble.18 Thus, in a case in which two children died at Cinder-ford, Forest of Dean, in 1932, the paper from a dry part of the wall contained 8-3 parts Asa03 per million, a sample where mould was most... 

During Roman times a considerable iron trade was established in Britain. In a.d. 120 Hadrian established an arms factory at Bath, where iron from the Forest of Dean was worked.1 But in the unsettled periods immediately succeeding the Roman occupation the industry lapsed, to be revived again shortly before the Norman Conquest. This latter invasion produced such an upheaval in the country that the trade again declined until about the fourteenth century. 

Limonite is found in relatively small quantity in the Forest of Dean, where iron ores were worked in Roman times. It is called brush ore, locally, when it occurs in stalactitic, reniform or compact masses, containing some 80 per cent, of ferric oxide or 56 per cent, of metallic iron and smith ore when incoherent and containing only 54 to 58 per cent, of ferric oxide (38 to 41 per cent, of iron).2... 

Thomas, B. A. (1972) A probable moss from the Lower Carboniferous of the Forest of Dean, Gloucestershire. Annals of Botany, 36 155-161. 

Hematite occurs very commonly in the oxidised regions of iron deposits (above the water table). It is a valuable iron ore (70% iron) and has been worked in many localities worldwide. The best known UK occurrence is in Florence mine in Cumbria and Church (1901) notes that this is the source of a particularly bright red pigment Similar deposits occur in the Forest of Dean (at Crawshay mine) but Heaton (1928) says that the supphes of Crawshay Red were exhausted around 1900. The world s largest hematite deposits are in the Great Lakes r on of the USA. Other important deposits are in Spain (Bilbao), Elba, Cuba and Brazil. 

Field (1835) describes purple ochre as a native ochre from the Forest of Dean, Gloucestershire, England, though in the 1841... 

Field (1835) describes purple ochre as a native ochre from the Forest of Dean, Gloucestershire, England, though in the 1841 edition he notes that it can be made artificially by calcining natural red ochres (qq.v.) and has been employed under the denomination of Violet de Mars . Salter (1869) remarks on the difficulty of obtaining the pigment and says mars violet was often compoimded, though usually with Indian red (qq.v.) as the base. Vibert (1892) on the other hand included it with permanent iron oxide colours which were either namrally fixed on clay or artificially on alumina. 

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