The fossil remains of Agathaumas were first found in 1872 in southwestern Wyoming . The bones were preserved in sand and clay sediments, packed with fossil sticks and leaves, indicating a heavily forested habitat . Cope later (in 1873) described the skeleton as "the wreck of one of the princes among giants." Later in 1872, Cope published a description and name for the animal, Agathaumas sylvestris , or "marvelous forest-dweller," in reference to its great size and the environment revealed in the same rocks as its bones . Since these were the first ceratopsian remains found, Cope was uncertain as to precisely what sort of dinosaur Agathaumas was (and for a time considered it a hadrosaur ) until O . In an 1889 paper, Cope suggested that Marsh's Ceratopsidae be renamed Agathaumidae, because of the paucity of Ceratops remains .