The movements of Earth's crustal plates that carry the continents and account for continental drift are the result of convection currents deep in the planet's mantle. The currents can build up stresses beneath the continents which eventually tear them apart.

Normally an elongated rift valley, associated with considerable volcanic activity, forms first of all along the line of the eventual split. The land on either side then separates and moves apart, an ocean area growing steadily to fill the gap. This happened when the large island of Madagascar split away from mainland Africa/Gondwana around 165 million BC, during the Middle Jurassic, and again more recently when the whole of eastern Africa split away to form Lemuria in the Posthomic, 50 million AD.

In the case of Lemuria the separation occurred before the ungulate herds of Africa had been mostly replaced by the rabbucks from northern temperate latitudes. As a result even-toed ungulates are as plentiful on the grassy plains of Lemuria as they ever were on the African mainland before the Holocene. Lemuria is the bastion of even-toed ungulates (there are no odd-toed ungulates present since they completely died out in the rest of the world long ago).

The land is mostly covered in tropical grasslands. There is a desert to the north and a tropical forest to the south.

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