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For example, roof slate referred to shale above a coal seam, and draw slate referred to shale that fell from the mine roof as the coal was removed. [ 16 ] The British Geological Survey recommends that the term "slate" be used in scientific writings only when very little else is known about the rock that would allow a more definite classification.
Slate has been quarried in north Wales for almost two millennia with the Segontium Roman fort at Caernarfon being roofed by local slate in the late second century. Export of slate has been carried out for several centuries, which was recently confirmed by the discovery in the Menai Strait of the wreck of a 16th-century wooden ship carrying finished slates.
Pioneers of Ffestiniog Slate. Snowdonia National Park Study Centre, Plas Tan y Bwlch. ISBN 0-9512373-1-4; Lindsay, Jean. 1974. A History of the North Wales Slate Industry. David and Charles, Newton Abbot. ISBN 0-7153-6264-X; Pritchard, D. Dylan. 1946. The Slate Industry of North Wales: statement of the case for a plan. Gwasg Gee. Richards, Alun ...
Swithland gives its name to a line of 'slate' outcrops found along the east side of Charnwood, from Hallgates and Little John, through Swithland Wood and The Brand, up to Woodhouse Eaves. All these locations have old slate quarry pits, as does a corresponding outcrop on the other side of the Charnwood anticline at Groby. Swithland Wood had been ...
Metamorphic rocks are formed when existing rock is transformed physically or chemically at elevated temperature, without actually melting to any great degree. The importance of heating in the formation of metamorphic rock was first noted by the pioneering Scottish naturalist, James Hutton, who is often described as the father of modern geology ...
Since 1999, slate imports from Spain, Portugal, Argentina and China caused the abandonment of local mining. Mining of Hunsrück slate was important for the discovery of fossils. Although not rare, fossils can only be found through extensive mining of slate. Many of the fine fossils exhibited in museums today were originally found by the slate ...
The Penrhyn Quarry is still producing slates, though at a reduced capacity compared to its heyday, and the Llechwedd Slate Caverns have been converted into a visitor attraction. [13] Several of the railways that used to carry the slates to the ports have been restored as tourist attractions, including the Ffestiniog Railway and the Talyllyn ...
Few important names in slate are Jak Black, Silver Shine, Silver grey, Panther, Deoli Green, Peacock, Peacock Multi, Kund Black, Kund Multi, and so on. Being to some extent fragile in nature, it is good for interior use only and can be used in even as a washboard.