Purbeck stone Purbeck stone Purbeck stone refers to building stone taken from a series of limestone beds found in the Upper Jurassic to Lower Cretaceous Purbeck Group, found on the Isle of Purbeck, Dorset in southern England. The best known variety of this stone is Purbeck Marble. The stone has been quarried since at least Roman times up to the present day. The Purbeck Group is a sequence of sedimentary rocks that were deposited in a shallow freshwater to brackish lagoonal setting. It ranges in age from Tithonian to Berriasian. Limestone beds are developed at various levels throughout the sequence, each with
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