hematite and iron carbonate existed but were not suited for com- mercial exploitation because the deposits were small and the ore quite impure." Limestone Limestone quarries were numerous across the broad central plain of Lancaster County during the nineteenth century. A plentiful supply of limestone near

The Anthracite Iron Industry of Lancaster County: Rolling Mills 1850-1900 By John Ward Willson Loose I. General Desciption Although rolling mills had been used early in the nineteenth century for reducing the thickness of bar iron produced at the forges, rolling mills as a separate industry were