Geography of Sheffield county, from bituminous (ideal for domestic heating) to "Thick Coal", of a semi-anthracitic quality, appropriate for use in iron-smelting and in engine furnaces. Associated with the Upper Coal Measures were valuable iron ore deposits, occurring in the form of nodules. Large quantities of locally occurring fireclay were also exploited, as well as ganister (a clay used to make refractory furnace linings). The city of Sheffield derives its name from the River Sheaf which Until the 17th century was written as "Scheth" or "Sheath". Sidney Oldall Addy equates the origins of this word with the Old English "shed" (as in "water-shed")
Sheffield City Airport Sheffield City Airport Sheffield City Airport was a small airport in Sheffield; it is now closed. It was in the Tinsley Park area of the city, near the M1 motorway and Sheffield Parkway, and opened in 1997. The airport's CAA licence was withdrawn on 21 April 2008 and it was officially closed on 30 April 2008, and the site is now part of the Advanced Manufacturing Park with various manufacturing businesses. An early proposal was made in 1968 to build an airport on land near Todwick in Rotherham but came to nothing. The lack of an airport in Sheffield was