The stone is from Peninsula Building Materials in Redwood City, CA. Each piece of stone was hand selected from the thin veneer range. This allowed the appearance of full stone with the engineering of concrete and a small footprint.
This was part of a larger masonry project with landscape architect Pete Pederson.
Here are some links to photos of the other parts of the project including stone columns and stairs built by Peter Warren and Heritage Brick and Stone: Pedersenassociates.com - Custom Stone Barbeque, Mill Valley, CA