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 Avenue about 100 feet west of the CTA Red Line for nearly all of its length, and the Brown Line and Purple Line for much of it. Six CTA stations are on the parallel segment near Sheffield, and two more are within a quarter-mile of the street's ends. The avenue runs through the heart of the DePaul University campus and the Wrigleyville neighborhood. In Chicago's grid system, 1000 W south of the North Branch River is known as Morgan Street, which runs through the city limits. The length of North Sheffield Avenue is three miles. Sheffield Avenue Sheffield Avenue is a