Allaru Formation

The Allaru Formation is a geological sequence in the Eromanga Basin composed of mudstone, siltstone, sandstone, and limestone. These strata document an ancient marine period that once covered parts of Australia.

The formation took shape during the Early Cretaceous about 112 to 100 million years ago when seawater covered the Eromanga Basin. This marine phase ended as waters retreated and the landscape transformed.

Scientists study the formation's diverse fossil assemblages, including dinosaur remains, marine reptiles, and fish species, to understand ancient Australian ecosystems.

Access to this geological formation typically occurs through scientific expeditions and fieldwork by geologists and researchers. Its location in Queensland requires planning and familiarity with the terrain.

The rock layers have preserved fossils of marine reptiles with crustaceans and fish remains still visible inside their stomach cavities. These details reveal what these ancient animals ate in their final moments.

Location: Queensland

Part of: Rolling Downs Group

GPS coordinates: -24.86730,146.23900

Latest update: December 13, 2025 17:03