Biogeography and Ecology in Madagascar by R. Battistini (auth.), R. Battistini, G. Richard-Vindard

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By R. Battistini (auth.), R. Battistini, G. Richard-Vindard (eds.)

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Parallel. The north-west coast, on the other hand, has very much calmer weather, being sheltered from these great ocean swells. In the region of Majunga or Nosy-Be, the sea is really only rough during the occasional cyclones, hut for the rest of the 16 time there are only slight local swells formed by the winds which blow alternately every day: the 'varatraza' (a land wind which blows mainly late at night and in the early morning) and the 'talio' (a sea breeze which blows during the afternoon until evening).

Also participated in the work in the sedimentary area to the west. Despite their inevitable inconsistencies, the 137 sheets ofthe 1 :200,000 series placed Madagascar in the front rank of tropical countries. At the 1952 International Geological Congress the Madagascar delegation presented a general 1: 1,000,000 map taken directly from the earlier surveys. While the existing maps had enabled fairly accurate geological surveys to be made, the aerial survey of Madagascar in 1949-1951 (400,000 km 2 ) and 1952-1955 (200,000 km 2 ) put into the hands of the geologists an accurate and sometimes wonderfully eloquent tool which was thenceforth in constant use.

3. Volcanic formations, occasionally of impressive extent. The most extensive belong to Upper Cretaceous eruptions and are found not only on the east coast (from Vohemar to the mouth of the Isandra) but also 32 on the west, where the flows are datable by their relationship to identifiable sedimentary layers. In places the crystalline basement reveals other volcanic intrusions of varying age, often difficult to date. They are sometimes considerable in relation to the size of the island, but they never approach the ex te nt or depth of the Cretaceous eruptions.

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