'' The fossilized cycadeoid beds were discovered in 1892 by F. H. Cole of
Hot Springs, South Dakota, in the 120-million-year-old
Dakota Sandstone Formation, near Minnekahta. Cole sent photographs of the fossils to Professor Henry Newton, a
geologist at the
Smithsonian Institution. Professor Thomas MacBride of the
University of Iowa published the first description of the site in 1893. There were believed to be large deposits of
Cretaceous cycad fossils. A few years earlier, ranchers in the area were unearthing fossil cycadeoids, which were described as prehistoric pineapples by them, to be sold off as curiosities. This practice was stopped due to the intervention of the University of Iowa, the Smithsonian and various institutions. In 1920,
Yale paleobotanist George Reber Wieland obtained the fossil-rich land under the
Homestead Act "in order that the cycads might not fall into unworthy hands". Two years later he offered to return the land to the federal government if a national monument could be established to protect the fossils. ==Establishment of the national monument==