Naturally occurring crude bitumen impregnated in sedimentary rock is the prime feed stock for petroleum production from "oil sands", currently under development in Alberta, Canada.
nˈætʃɚɹəli əkˈɜːɹɪŋ kɹˈuːd bɪtˈuːmɛn ɪmpɹˈɛɡneɪɾᵻd ɪn sˌɛdɪmˈɛntɚɹi ɹˈɑːk ɪz ðə pɹˈaɪm fˈiːd stˈɑːk fɔːɹ pətɹˈoʊliːəm pɹədˈʌkʃən fɹʌm "ˈɔɪl sˈændz", kˈɜːɹəntli ˌʌndɚ dɪvˈɛləpmənt ɪn ælbˈɜːɾə, kˈænədə.