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當年筆記，試圖找出這個五角龍標本的最初挖掘地點。朗里奇等人根據化石週圍的母岩，而認為化石屬於弗鲁特蘭組（Fruitland Formation）上層或基德蘭組（KirtlandFormation）的下層，地質年代約7450萬到7370萬年前，相當於晚白堊紀的晚坎潘階，但詳細的挖掘地點已不可考；他們
goodwini）发现于科特兰组（英语：Kirtland Formation）丹纳辛段（Den-na-zin Member）可能还有美国新墨西哥州圣胡安县果园组（英语：Fruitland Formation）（晚坎帕期）的化石森林段（Fossil Forest Member）；布氏圆头龙（S
County, New Mexico. 2. Vertebrate faunas of the Ojo Alamo, Kirtland and Fruitland Formations. United States Geological Survey Professional Paper. 1916,
N.J., Hunt, A.P., and O'Neill, F.M., 1987, "Dinosaurs, the age of the Fruitland and Kirtland Formations, and the Cretaceous-Tertiary boundary in the San
County, New Mexico. 2. Vertebrate faunas of the Ojo Alamo, Kirtland and Fruitland Formations. United States Geological Survey Professional Paper. 1916,