ðə mˈaʊntɪn pɹəvˈaɪdz ɐn ɛɡzˈæmpəl ʌvðə ɡɹˈeɪt ʌŋkənfˈoːɹmᵻɾi wɪððə tˈɪltᵻd pˌeɪliːoʊzˈoʊɪk tˈeɪpæts sˈændstoʊn ˌʌndɚlˈeɪn baɪ pˌeɪliːoʊpɹˌoʊtɹəzˈoʊɪk vˈɪʃnuː ʃˈɪst, wˌɪtʃ ɪz sˌʌm ʌvðɪ ˈoʊldɪst ɹˈɑːk ɔnðə nˈɔːɹθ ɐmˈɛɹɪkən kˈɑːntɪnənt, hˌævɪŋ bˌɪn kɹiːˈeɪɾᵻd ɐbˌaʊt tˈuː bˈɪliən jˈɪɹz ɐɡˈoʊ.
The mountain provides an example of the Great Unconformity with the tilted Paleozoic Tapeats Sandstone underlain by Paleoproterozoic Vishnu Schist, which is some of the oldest rock on the North American continent, having been created about two billion years ago.