Once part of the

[taixyz1992]

Once part of the supercontinent Gondwana, Madagascar broke away from eastern Africa, the likely source of the ancestral lemur population, about 160 mya and then from Antarctica between 80 and 130 mya. Initially, the island drifted south from where it split from Africa (around modern Somalia) until it reached its current position between 80 and 90 mya. Around that time, it split with India, leaving it isolated in the Indian Ocean and separated from nearby Africa by the Mozambique Channel,[24][25][26] a deep channel with a minimum width of approximately 560 kilometers (350 mi).[13] These separation dates and the estimated age of the primate lineage preclude any possibility that lemurs could have been on the island before the Madagascar pulled away from Africa,[27] an evolutionary process known as vicariance.[26] In support of this, mammalian fossils on Madagascar from the Cretaceous (see Mesozoic mammals of Madagascar) include gondwanatheres and other mammalian groups that would not have been ancestral to lemurs or the other endemic mammals present on the island today.[13]


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