ˈɔːl spˈɛsɪmənz ʌv ˈæɡjuːdʒˌæsɚɹˌætɑːps wɜː kəlˈɛktᵻd fɹʌmðə lˈoʊɚ pˈɑːɹt ʌvðɪ ˌʌpɚ ʃˈeɪl mˈɛmbɚɹ ʌvðɪ ˈæɡjuːdʒə fɔːɹmˈeɪʃən, dˈeɪɾɪŋ tʊ ɐbˌaʊt sˈɛvənti sˈɛvən mˈɪliən jˈɪɹz ɐɡˈoʊ, ɪnðə bˈɪɡ bˈɛnd nˈæʃənəl pˈɑːɹk, bɹˈuːstɚ kˈaʊnti.
All specimens of Agujaceratops were collected from the lower part of the Upper Shale member of the Aguja Formation, dating to about 77 million years ago, in the Big Bend National Park, Brewster County.