wˈɪljəmz ˈɛstᵻmˌeɪɾᵻd ðə dˈeɪt ʌvðə pˈɛtɹəɡlˌɪfz æt θɹˈiː θˈaʊzənd fˈaɪv θˈaʊzənd bˌiːsˌiːˈiː, ænd dᵻskɹˈaɪbd ðˌɛm æz bᵻlˈɔŋɪŋ tʊ ɐ spəsˈɪfɪk "tˈaɪp" ʌv pˈɛtɹəɡlˌɪf—sˈʌbsᵻkwəntli ɹᵻfˈɜːd tʊ æz ðə "ˈeɪʃæltən tˈaɪp"—ðæt ɪz dᵻfˈaɪnd baɪ ɐ dɪstˈɪŋktɪvli fˈɪɡjɚɹətˌɪv stˈaɪl.
Williams estimated the date of the petroglyphs at 3000–5000 BCE, and described them as belonging to a specific "type" of petroglyph—subsequently referred to as the "Aishalton type"—that is defined by a distinctively figurative style.