It is a flaggy and blue - colored limestone that is 15 feet ( 4.6 m ) thick and dips at an angle of six to eight degrees .
The Lower Helderberg Limestone occurs a small distance north of Mud Creek , where it is quarried .
Mud Creek is a flaggy and blue - colored limestone that is 15 feet ( 4.6 m ) thick and dips at an angle of six to eight degrees .
The Lower Helderberg Limestone occurs a small distance north of Mud Creek , where it is quarried .