Cedar Wood Slab | Washington mineral each stone is unique in

each stone is unique in shape and color

The shell of this ammonite has been replaced by calcite

There are indications that plesiosaurs were warm-blooded

particularly in the White River Formation of the western United States

4" in length

Cedar Wood Slab | Washington mineral each stone is unique inCedar Miocene Washington Approx. size: 12" x 11" x 0. 75" Stand not included. This gorgeous slab of petrified Cedar wood comes from Washington. It boasts a substantial size, aesthetic shape, well preserved growth rings, and intricate wood structure. One side has been polished to a glossy finish. Petrified wood is formed through a process called permineralization, where mineral rich groundwater replaces the original organic material. This process