Geosonnet 43

Marsupial invaders from the South

Make North America their newfound home.

Alpacas, llamas, spitting from the mouth

Run off to South America to roam.

The rocks in Panama suggest the land

Connected continents by Miocene.

Pliocene movement, on the other hand

Means radiative retardation’s seen.

A sea of trees, could rainforest impair

Migration of savannah-dwelling beast?

The ice age brought colder and drier air

And grasslands on which ungulates can feast.

   Tectonics may have built the bridge of land.

   Ten million years unused, we understand.

Geology 44 375

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