ɐ lˈoʊ ˈɪnsɪdəns ʌv kˈɔːɹɾɛks wʊd ˈɪndᵻkˌeɪt kwˈɔːɹi pɹɪfˈɔːɹmɪŋ kˈɔːɹɾɛks ɹᵻmˈuːvd æt ðə kwˈɔːɹi, nˌɑːt æt ðə sˈaɪt.
A low incidence of cortex would indicate quarry preforming (cortex removed at the quarry, not at the site).