Eromanga/Cooper Basin Discoveries


Natural History Society



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Coming soon – additional information & illustrations


‘ZAC’ the titanosaur

Possibly Australia’s Most Complete Sauropod Skeleton

Named after ANZAC day having been being discovered on this day in 2006. At the June 2010 dig it became clear that Zac is one of Australia’s most complete sauropods with over 60 bones already discovered. For the scientifically minded, Zac is the only known articulated skeleton of a sauropod from the Cretaceous Period of Australia. Zac is most likely a new genus and species of dinosaur.


Profile of ‘Zac’

Location: West of Eromanga, South-west Queensland, Australia.

Age: Approximately 95-98 million years ago: Cenomanian Epoch , mid-Cretaceous Period.

Size: Based on the remains so far discovered Zac was probably between 15-20m long making it a large sauropod.

Type: Medium-sized plant-eating (herbivorous) sauropod dinosaur.

Formation: Winton Formation, Eromanga Basin.

Classification: It is difficult to determine the classification of Zac because much of the skeleton is enclosed in solid rock, awaiting preparation. Based on specimens so far found Zac will be a peculiar sauropod and unique scientifically, most-likely a species of titanosaur.

Excavation: Excavation of ‘Zac’s’ skeleton only begun in the 2009 field season. The full potential of this dinosaur site is yet to be realized but Paleontologists say these new discoveries confirm that the South-west Queensland sites will be of great significance, not only for Australia, but for the greater understanding of all dinosaurs. Early indications are the ‘Zac’s skeleton is different and even more complete than ‘Cooper’s’.


Interesting facts about ‘Zac’:

  • A very rare articulated sauropod, the only one known so far from the Cretaceous Period of Australia.
  • ‘Zac’ represents a new dinosaur species to the world.
  • ‘Zac’s site was discovered on ANZAC day in 2006 and this is where the nickname ‘Zac’ came from.

‘ZAC II’ and ‘Zac Baby’

Two other distinct dinosaurs have been discovered at the Zac site and probably represent a second sauropod of the same species as Zac and a younger individual.