A 12 month study on the thermal regime for a thufa apex and its adjoining depression was undertaken in the Mashai Valley (∽2950 m ASL), Lesotho Highlands, during 1993–94. Pronounced temperature differentials occurred during the winter months when apexes were frozen for several weeks and depressions remained predominantly unfrozen. The data show that existing micro-topography is an important factor controlling the maintenance or further development of thufur in marginal periglacial environments.
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Stefan Grab (1997) studied this question.
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