The Manis Mastodon site is a archaeological site on the Olympic Peninsula near Sequim, Washington, United States, discovered in 1977. During the 1977-78 excavation, the remains of an American mastodon were recovered with a 13,800-year-old projectile point made of the bone from a different mastodon embedded in its rib. The site was placed on the National Register of Historic Places in 1978. History On August 8, 1977, a farmer named Emanuel Manis was digging his property with a backhoe when he found the tusks of an American mastodon. An archaeological excavation led by Dr. Carl Gustafson of Washington State University found a rib bone that had what appeared to be a spear point made from the bone of a different mastodon embedded in it. The point had bone growth around it, indicating that it had not caused the mastodon's death. Gustafson deemed it the earliest known evidence of interaction between humans and mastodons in the Americas. However, there was debate, because of the lack of indisputable proof that the point was made by humans. This situation changed in 2011, when a new study of the remains definitively concluded that Gustafson was right as to both the age and the human origin of the point. Gustafson also analyzed the position of the fossil, which was lying on its left side, while the heavily fragmented skull was rotated 180 degrees from its natural position. Noting that this could not have occurred due to natural causes Gustafson deduced that the carcass must have been tampered with by humans. Archaeologists were surprised to find a mastodon in the area at all because pollen samples that were taken showed no evidence of trees, which mastodons fed on. In an excavated layer above the mastodon, as well as that of a 6,700-year-old deposit of ash from the eruption of Mount Mazama, a projectile-point was found in the style of Cascade points common in the area no earlier than 9,000 years ago. The site also turned up remains of caribou, bison, and plant macrofossils. Bones of the bison showed evidence of butchering by humans. The pollen found in the same layer as the mastodon was predominantly sedge and cattail, while other layers contained that of plants ranging from Canadian buffaloberry, blackberry and wild rose, to willow and alder. Gustafson continued to excavate at the site for eight years, finding the partial remains of two more mastodons. Though