During the earliest part of the Period the glacial phase was at its most intense, and as the continent was still on the equator, the climate was probably cool, but not glaciated.
Sea levels reached their lowest level at the start of the Period, rising again after the ice melted.
Sediments collected on a large delta in the , the oldest known hydrocarbons found in eastern Australia.
At this time, near Melbourne and Bathurst, deep ocean troughs were accumulating sediments, in eastern Victoria and around Canberra there were shallow seas with reefs and a rich, diverse shallow water fauna populating a shelf that extended north through the New England area all the way to North Queensland.
The In the Northern Hemisphere, the landmasses were a number of separate blocks.