Geology / Maps
Meridian 180° : 420 Million Years ago
The vast Silurian ocean, broadly on the lines of present day Pacific, covers about half the map area. The land area forms the north eastern coastline of Gondwana forms part of present day Indonesia, Australia, Antarctica.
The inland 'sea' just south of the center is bounded by present day Antarctica to the NE, Africa to the South, and South America to the south east.