Limb Cast, Agatized Wood- Wiggin's Fork, Wyoming

Limb Cast, Agatized Wood Locality: Wiggin's Fork, Wyoming Dimensions: 5.3 x 4.6 x 3.9 cm Fun limb cast from Wiggin's Fork. A limb cast is a type of fossil formed when a tree branch or limb becomes buried and is later replaced or filled with minerals. Unlike petrified wood, which preserves the internal cellular structure of the wood, a limb cast primarily preserves the external shape of the branch. Some may characterize the internal agate as "moss agate".