bˈoʊθ ðə wˈɔːlz ʌvðə wˈɔljʊlə ɡˈæp ænd ðə kəlˈʌmbiə ɹˈɪvɚ ɡˈoːɹdʒ ˈɔːlsoʊ ʃˈoʊ ðə ɹˈʌfplˈʌkt sˈɜːfɪsᵻz kˌæɹɪktɚɹˈɪstɪk ʌv kˈɑːlkɪɹˈoʊdᵻd ɹˈɑːk.
Both the walls of the Wallula Gap and the Columbia River Gorge also show the rough-plucked surfaces characteristic of kolk-eroded rock.