672
Climatic Geomorphology
Figure 25.28. Difference in quartz percentage in late-glacial and Holocene sections of Atlantic sediment
cores. Enhanced late-glacial concentrations in the Northern Hemisphere tropical zone are interpreted as the
product of dust inputs deflated from an expanded Sahara and/or due to stronger circulation systems (after
Kolla et al. (1979)).
within the different deserts in the world, however, provides valuable information on the
extension, duration and distribution of the periods of marked aridity, as well as on the changes
in wind directions and circulation systems through time (Lancaster, 1995).
The dating of sandy accumulations has been one of the most important problems. Until
a short time ago, dating was difficult and dates were relative. Thus, for example, C-14
Climatic Geomorphology
Figure 25.28. Difference in quartz percentage in late-glacial and Holocene sections of Atlantic sediment
cores. Enhanced late-glacial concentrations in the Northern Hemisphere tropical zone are interpreted as the
product of dust inputs deflated from an expanded Sahara and/or due to stronger circulation systems (after
Kolla et al. (1979)).
within the different deserts in the world, however, provides valuable information on the
extension, duration and distribution of the periods of marked aridity, as well as on the changes
in wind directions and circulation systems through time (Lancaster, 1995).
The dating of sandy accumulations has been one of the most important problems. Until
a short time ago, dating was difficult and dates were relative. Thus, for example, C-14