Mathematics – Logic
Scientific paper
Dec 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esrv...25..481s&link_type=abstract
Earth Science Reviews, Volume 25, Issue 5-6, p. 481-484.
Mathematics
Logic
2
Scientific paper
Well into the Mesozoic Era, Africa, South America, India and Australia were joined to Antarctica in one supercontinent—Gondwanaland. The northern continents were also joined to form the supercontinent Laurasia. Southern Hemisphere land masses, especially Australia, have been characterised by a long period of relative geological stability and a short period of glaciation during the Quaternary. These circumstances have led to the development of quite old landscapes, developed on surfaces subjected to the processes of weathering for millions of years. Unlike the Gondwanaland continents, much of the Northern Hemisphere has been tectonically active with orogenic processes producing young uplifted surfaces subjected to active erosion. The Northern Hemisphere has experienced four extensive and intense Pleistocene glaciations. The consequence of these periods of glaciation is that present-day landscapes are substantially the product of climate over the past 10,000 years and commonly have not undergone extensive weathering. The applicability therefore of Northern Hemisphere-derived models to explain things as diverse as landforms, stream patterns and processes, soil genesis and ecological theory in the Southern Hemisphere has increasingly come into question. Because southern landscapes have a physiography and palaeohistory quite different from that of the Northern Hemisphere, it provides an unparalleled opportunity to develop new concepts and theories which may have implications for the whole globe.
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