ɪn nˈaɪntiːnhˈʌndɹɪd nˈaɪnti nˈaɪn dˈʊɹɹɪŋ ɐn ˌɛkspədˈɪʃən baɪ ðə jˌuːnɪvˈɜːsᵻɾi ʌv ɐlˈæskə, ɐn ˈaɪsəlˌeɪɾᵻd pˌækɪsɪfˈæləsˌɔːɹ skwɑːmˈoʊzəl wʌz ʌnˈɜːθt fɹʌm blˈʌfs ɔnðə bˈæŋk ʌvðə kˈɑːlvɪl ɹˈɪvɚɹ ɪn nˈɔːɹθ slˈoʊp bˈʌɹoʊ, ɐlˈæskə.
In 1999 during an expedition by the University of Alaska, an isolated pachycephalosaur squamosal was unearthed from bluffs on the bank of the Colville River in North Slope Borough, Alaska.