The Devil's Screw Cone is a tree-sized, spiral-shaped underground structure. Its basic form is an elongated spiral made of hardened earthy material up to 3 meters deep. These puzzling structures were originally created by E. Leeson, Nebraska, near the University of Nebraska. H. Barber took note in 1891 and 1892. He then described it as a giant freshwater sponge. This identification is influenced by the environment in which the "screw cones" are located, which were located in huge freshwater lakes during the Miocene 20 million years ago.
In 1893, Dr. Thomas Barber proposed that the devil's screw cone was the cave of a large rodent, and Latinized the name as Daimonhelix, Daimonelix, or Daemonelix, classifying them according to shape and size.
But previously Barber published an article in the June 1895 issue of the American Naturalist, Volume 29, in which Barber insisted that the suzuran was the result of calcification of plant morphology. One of The arguments made by Barber is that the shape of the devil's screw cone is so perfect that it cannot be constructed by animals, but must be plant constructed or some other lower life form structure. Barber also noted in the article that the discovery of beaver fossils does not prove the origin of Daemonelix, as fossilized bones of a mammal as large as a deer have also been found.
For a long time, people tended to believe that the Devil Screw Cone was a strange extinct plant, and many people were skeptical. However, the discovery of fossilized ancient beavers confirms the view that these structures are caves dug out by ancient beavers, and researchers believe that ancient beavers dug out these caves through their teeth, not their claws.