The Eocene was the last, yet most glorious chapter in the history of chasmosaurines. While North America  was ruled by the massive Brontoceratops, Eurasia was a home to another ceratopsian giant. The chasmosaurine ancestors of Gigantops had crossed the land bridge between Asia and North America during the early Eocene and at tthe time ruled all the northern continents. Gigantops was quite likely the largest of the Eurasian chasmosaurines with a head as long as that of Torosaurus, even though the neck frill of Gigantops was proportionally shorter.