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CONTINENTAL DRIFT 71

(Section 4.1.7). In order to position the continents in
their correct paleolatitudes however, paleomagnetic FURTHER READING
results must be combined with these reconstructions
to identify the positions of the paleopoles and paleo-
equator. The sequence of paleogeographic maps in Frakes, L.A. (1979) Climates Throughout Geologic Time. Elsevier,
New York.
Chapter 13 (Figs 13.2–13.7) was obtained in this way.
McElhinny, M.W. & McFadden, P.L. (2000) Paleomagnetism: conti-
For any time prior to 200 Ma the constraints pro-
nents and oceans. Academic Press, San Diego.
vided by the oceanic data are no longer available Tarling, D.H. & Runcorn, S.K. (eds) (1973) Implications of Continen-
and reconstructions are based on paleomagnetic tal Drift to the Earth Sciences, vols 1 & 2. Academic Press,
results and geologic correlations. Examples of these London.
pre-Mesozoic reconstructions will be discussed in Tarling, D.H. & Tarling, M.P. (1971) Continental Drift: a study of the
Chapter 11. Earth’s moving surface. Bell, London.