Iron Hill (Delaware)
Iron Hill is a prominent geographical feature in the vicinity of Newark, Delaware, in the United States. With a topographic prominence of , it is the most prominent hill in Delaware. However, its peak elevation of means that it is not the state's highest point, which is located in the Piedmont plateau region near Centreville where a peak elevation of is attained at Ebright Azimuth. The hill is named for its iron deposits, which were mined over a 200-year period during the 18th and 19th centuries. It is part of a New Castle County park known as Iron Hill Park. Location Iron Hill is located just south of Newark in Pencader Hundred, with the summit lying south of Interstate 95 and west of Delaware Route 896. It is the easternmost and highest of three geologically similar peaks, together with neighboring Chestnut Hill and Gray's Hill (across the border in Maryland). Geology Iron Hill and the two neighboring hills are outlying Piedmont outcroppings, east of the fall line and surrounded by the relatively flat Atlantic coastal plain. The hills are igneous intrusions of "Iron Hill Gabbro", a coarse and dark-colored rock composed mainly of plagioclase, pyroxenes, and olivine. The rock contains