Limestone high quality quarried limestone, called Indiana limestone. Many famous buildings in London are built from Portland limestone. Limestone was also a very popular building block in the Middle Ages in the areas where it occurred, since it is hard, durable, and commonly occurs in easily accessible surface exposures. Many medieval churches and castles in Europe are made of limestone. Beer stone was a popular kind of limestone for medieval buildings in southern England. Limestone and (to a lesser extent) marble are reactive to acid solutions, making acid rain a significant problem to the preservation of artifacts made from this stone.
Hawk Stone Hawk Stone The Hawk Stone is a neolithic standing stone just north of the hamlet of Dean, Oxfordshire, England. The name either derives from its shape, being like a hawk, or is a corruption of the word 'hoar' meaning 'old'. The Hawk Stone stands on Spelsbury Down, 900 metres west of Spelsburydown Farm. The stone stands to a height of 2.6 metres, and it has a width of approximately 1 metre by 0.9 metres at its base and tapers to 0.9 metres at the apex. It is made from oolitic limestone. A concave hollow in its upper face is known