DW: Silurian Period

The Silurian was a period in the Palaeozoic, visitable in the Doctor Who Expansion.

The lower levels of oxygen and higher levels of CO2 in the atmosphere present a threat for unprotected characters. They will suffer 5 (atmo) damage per turn.

Creatures

 * DW: Mesacanthus
 * DW: Megarachne
 * DW: Eurypterus
 * DW: Pterygotus
 * DW: Calymenina sp.
 * DW: Orthocone