32
Climatic Geomorphology
(10) Equatorial zone ofpartial planation. This is not a very well studied zone due to the
relative difficulties of research because of its dense tree cover. Chemical weathering
is more intense than in the other areas. Planation surfaces and inselbergs that
originated in prior humid-dry climates of the Tertiary occur in those regions that
have limited development of preceding climate zonation. In the central areas of these
zones planation surfaces undergo little reworking because the formative mechanisms
have greatly decreased in space and time.
These classifications of analysed morphoclimatic areas reveal an important variation
within the different main climatic zones: Btidel (1948) 7; Peltier (1950) 9; Biidel (1963) 5;
Tricart and Cailleux (1965) 13; Wilson (1968) 6; Bfidel (1977) 10 and Chorley et al.
(1984) 8. These modifications follow the different approaches used by the different authors
to carry out the subdivision of the Earth's surface in different morphoclimatic areas.
The monographs published on different morphoclimatic zones have been focused in
the following four categories: glacial, periglacial, arid and tropical humid regions. The
temperate regions have not been the object of a joint treatment due to the large number of
presently existent relict landforms. Evidently, the development of the published reviews
on these four climatic regions takes into account more detailed differentiations within the
master climatic areas.