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 Swimming Club Sheffield City Swimming Club Sheffield City Swimming Club is the longest established competitive swimming club in Sheffield, and they train at a number of pools across the city of Sheffield, including Ponds Forge International Pool. They have been accredited with the Amateur Swimming Association (ASA) as a swim21 club since 2003 and have also achieved Sport England Clubmark status. These kitemarks indicate that the club provide a safe sporting environment for swimmers of all ages and follow best practice in child protection, club administration, coach education, and swimmer development. Swimmers of Sheffield City Swimming Club compete in a wide range