This formation is from the early Cretaceous, and is composed of numerous lenses of oil-bearing sand with up to 20% oil.
ðɪs fɔːɹmˈeɪʃən ɪz fɹʌmðɪ ˈɜːli kɹɛtˈeɪʃəs, ænd ɪz kəmpˈoʊzd ʌv nˈuːmɚɹəs lˈɛnzᵻz ʌv ˈɔɪlbˈɛɹɪŋ sˈænd wɪð ˌʌp tə twˈɛnti pɚsˈɛnt ˈɔɪl.