Building stones and lime are made from limestone. Most of the limestone needed in Tennessee for construction, cement, and agriculture comes from rocks dating back 435 million years or more to the Ordovician Period. These rocks occur in central and eastern Tennessee. In central Tennessee they are mined for phosphate. In eastern Tennessee the Holston Formation is quarried for the high quality commercial marble it contains.
Marble is simply limestone that has been subjected to great pressure and heat.
Learn more about limestone and marble at Prehistoric Topics .