There are several varieties of marble in the State of Alabama, both crystalline and semi-crystalline. The chief semi-crystalline marbles comprise the variegated and somewhat brecciated deposits of Middle Cambrian age in Shelby County, near Calera;2 the gray and somewhat variegated marble, chiefly of Pelham age, at Pratts Ferry, Bibb County,3 and the local deposits of marbelized Subcarboniferous and Knox limestones in the northern part of the State. Of these the Pratts Ferry deposit alone has been in the past considerably developed.
The crystalline marbles of the State are the only ones which are now being quarried. They are located in a long and narrow area extending through Talladega County and into the northern portion of Coosa County—a distance of approximately 35 miles in a northeast and southwest direction (see map showing location of marble . . .