1. Abell, P.I. and M.A.J. Williams 1989. Oxygen and carbon isotope ratios in gastropod shells as indicators of palaeoenvironments in the Afar region of Ethiopia. Palaeogeography, Palaeoclimatology, Palaeoecology 74, 265–78.
2. Adamson, D.A. and F. Williams 1980. Structural geology, tectonics and the control of drainage in the Nile Basin. In The Sahara and the Nile, M.A.J. Williams and H. Faure (eds), 225–52. Rotterdam: Balkema.
3. Adamson, D.A. and M.A.J. Williams 1987. Geological setting of Pliocene rifting and deposition in the Afar Depression of Ethiopia. Journal of Human Evolution 16, 597–610.
4. Alley, N.F. and Lindsay, J.M. 1995. Tertiary. In The geology of South Australia, Volume 2. The Phanerozoic, J.F. Drexel and W.V. Preiss (eds), Bulletin 54, 151–217. South Australia: Geological Survey.
5. Ayliffe, L.K., Marianelli, P.C., Moriarty, K.C., Wells, R.T., McCulloch, M.T., Mortimer, G.E. and Hellstrom, J.C. 1998. 500 ka precipitation record from southeastern Australia: Evidence for interglacial relative aridity. Geology 26, 147–50.