ABSTRACT
THE GREAT ICE AGE 1.2 Modified from Figure 5.2 of Skelton, P., Spicer, R.A. and Rees, A., 1997, Evolving Life and the Earth, The Open University, Milton Keynes.
1.3 Modified from Figure 4.7 in Whittaker, R.H., 1975, Communities and ecosystems (2nd edition), Macmillan, New York.
