LI THE SANDY DESERTS OF PERSIA 245
the basin. The zones of dunes we now find on the southern edge of the depression will then lie where they are for all future time, for there, and there only, are all conditions of their existence fulfilled. Only as weathering proceeds and the hills, which now check the winds and the farther movement of the sand-dunes, lose their effect, can
.1 the sandy belts have an opportunity of gaining • ground. .1 The sandhills on the coast of Baluchistan are certainly not
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