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.
Lutetian Limestone Lutetian Limestone Lutetian Limestone (in French, "calcaire lutécien", and formerly "calcaire grossier") — also known as “Paris stone” — is a variety of limestone particular to the Paris, France, area. It has been a source of wealth as an economic and versatile building material since ancient Roman times (see Mines of Paris) and has contributed markedly to the unique visual appeal of the “City of Light”. (It has been hailed as “the warm, elusive, cream-grey stone of the French capital”.) Its formation dates to the Eocene epoch's Lutetian age (between ). The name "Lutetian" derives from Lutetia (French, "Lutèce") which