1. Powell, J.H. (1989) Stratigraphy and Sedimentation of the Phanerozoic Rocks in Central and South Jordan: Part B: Kurnub, Ajloun and Balqa Groups. Bulletin 11. Geological Mapping Division, Natural Resources Authority, Amman, 130 p.
2. Boggs Jr., S. (2005) Principles of Sedimentology and Stratigraphy. 4th Edition, Pearson, London.
3. Bandel, K., Shinaq, R. and Weitschat, W. (1997) First Insect Inclusions from the Amber of Jordan (Mid Cretaceous). Mitt. aus dem Geol. Palaont. Inst., Univ. Hamburg, H80, 213-223.
4. Njoh, O.A. and Taku, A.J. (2016) Shallow Marine Cretaceous Sequences and Petroleum Geology of the Onshore Portion Rio del Rey Basin, Cameroon, Gulf of Guinea. Open Journal of Marine Science, 6, 177-192.
5. Shinaq, R. and Bandel, K. (1998) Lithostratigraphy of the Belqa Group (Late Cretaceous) in Northern Jordan. Mitteilungen aus dem Geologisch-Palaontologischen Institut der Universitat Hamburg, 81, 163-184.