The Wonthaggi Formation was deposited within Gippsland Basin, which formed part of a extensional rift valley system between Australia and Antarctica.

The lithology primarily consists of fluvially deposited siliciclastics derived from volcanic rocks of the Whitsunday Silicic Large Igneous Province to the East, with suggestions that the sediments either originated from braided river and sheet flood deposits, or meandering river systems on vegetated floodplains.

[3] Indeterminate ornithopod remains are present in Victoria, Australia.

[3] Indeterminate megaraptorid remains are present in Victoria, Australia.

"[6] Serendipaceratops[1] S. arthurclarkei[1] The Arch, Kilcunda Aves[7] Indeterminate Possibly also present at the Eumeralla Formation (footprints).