Cahyaningsih, Catur, Ritonga, Anjas, Aldila, Shaury, AND Zulhikmah, Zulhikmah. " Lithofacies And Depositional Analysis Environment Of West Section Kolok Nan Tuo Village, Sawahlunto City, West Of Sumatera" Journal of Geoscience, Engineering, Environment, and Technology [Online], Volume 3 Number 2 (1 June 2018)