Figure C20 ASTHENOSPHERE

A hallway grand leads south, all dressed in stone

Of many shades: here is remembered by

Its native rocks, each continental zone

Of ancient time, long hidden from the sky.

Vaalbara’s zircon, Doggerland yet dry,

Basalt slabs from Kerguelen afar,

Granite of Farallón, tormented by

Tectonic might, and lost Zealandia’s bar,

Beneath the southern waves a home to Neptune’s car.