History of anthracite coal mining in Pennsylvania railroad system made transporting the anthracite exponentially easier, and by the 1860s anthracite coal was regularly supplying urban centers like Philadelphia and New York City and was helping to fuel the American Industrial Revolution. Anthracite and bituminous coal were formed in the eastern and western regions of Pennsylvania respectively during the Pennsylvanian time in the Carboniferous Geological Period (“History of Anthracite Coal Mining”). The Pennsylvania Anthracite Region is in the Valley and Ridge Province of the Appalachian Mountains, with the coal located in the folded and faulted terrain of the Province. The anthracite fields are maintained in synclinal basins that
Anthracite budgerigar mutation just one Anthracite allele correspond to the splits of recessive mutations. A single Anthracite factor has a similar effect to the Dark mutation, causing a Skyblue to become Cobalt in appearance - as was suspected with the English Grey. In fact, the similarity of the Anthracite to the English Grey is striking. The description is virtually identical, and the cobalt appearance of a Skyblue with a single Anthracite factor is exactly what was suspected for the English Grey. The interaction of the Anthracite and Dark budgerigar mutations has not yet been investigated. It is expected that a combination of the