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.
Indiana state stone (sculpture) quarry as well as the famous Empire hole. The fine-grained limestone quarried at the P. M. & B. quarry is commonly referred to as Indiana Limestone, named after the state where it is quarried. Indiana Limestone is more formally termed Salem limestone, which is the name of the geologic formation that consists of this carbonate rock. Salem Limestone is a grain stone that is Mississippian in age. The limestone at the P. M. & B. Quarry is 98.40 percent calcium carbonate, making it more pure than the average Salem Limestone in Indiana, which averages approximately 97 percent calcium carbonate. Throughout