When the Lewis and Clark Expedition needed canoes, friendly Indians showed the explorers how to hollow logs, made from large ponderosa pines, with a method of burning and chipping. The Corps of Discovery adopted what Sergeant Patrick Gass called, "the Indian method of burning out the canoes." After building a small fire in the area of the log to be hollowed out, the resulting charcoal was then easily chipped out. The process was then repeated, until the desired shape was obtained.
Members of the Lewis and Clark Expedition are depicted in one of these “dug outs” on the 2005 Silver Dollars issued by the Sovereign Nation of the Shawnee Tribe. Each 1 oz. pure Silver Dollar comes in an inscribed pouch with a certificate of authenticity.