1. AL‐AMERI, T.K. 1980.Palynology, biostratigraphy and paleoecology of subsurface and Palaeozoic strata from the Ghadames Basin, Libya., 476University of London. Unpublished MSc thesis
2. Spherical phosphatic microfossils from the Silurian of North Greenland
3. AMSDEN, T.W. 1957.Stratigraphy of the Hunton Group., Oklahoma Geological Survey Circular Vol. 44, 57
4. _____. 1960.Stratigraphy and paleontology of the Hunton Group in the Arbuckle Mountain region. Part VI ‐ Hunton stratigraphy., Oklahoma Geological Survey Bulletin Vol. 84, 311