Arifullah, E., Zaim, Y., Aswan, & Djuhaeni. (2021). Basin-scale Paleoecology: Using Semi-quantitative Analysis of the Ichnofabric within Kutai Basin (Indonesia). Journal of Mathematical and Fundamental Sciences, 53(2), 286-305. https://doi.org/10.5614/j.math.fund.sci.2021.53.2.8