The mid-Cretaceous Winton Formation is one of Australia's most important sources of Mesozoic terrestrial fossils. In recent years it has produced some of the continent's most significant body and trace fossil records of mid-Cretaceous dinosaurian and crocodilian assemblages. Additionally, the Winton Formation preserves a diverse assemblage of lungfish and primitive ray-finned fish, aquatic lizards, turtles, numerous invertebrates along with a high diversity of plant macrofossils, including some of the world's earliest flowering plants. The Winton Formation is exposed over large portions of remote central-western Queensland, in addition to northern New South Wales, north-western South Australia and the south-western corner of the Northern Territory. Despite its importance for our understanding of Australian terrestrial environments during the latter part of the Mesozoic, very little in the way of detailed geological work has been carried out on the Winton Formation. As a consequence, palaeoenvironmental and palaeoecological conditions associated with many of Australia's key dinosaur faunas are poorly understood. A greater understanding of the stratigraphy, sedimentology, age, and taphonomy of these sites will provide critical context for evaluating Australia's late-Mesozoic vertebrate taxa to other well-known Gondwanan faunas. This study utilizes detrital zircon geochronology and Lu-Hf isotope analysis to constrain the depositional age, tectonic setting, basin evolution, and stratigraphic context of the Winton Formation, northeastern Australia. A number of geological studies in the past several decades have focused on U-Pb detrital zircon geochronology for maximum depositional age; however, this approach is still underutilized in palaeontology. Thus, these ten samples, which were composed of ~100 grain detrital zircon samples from different stratigraphic levels and key fossil locations throughout the Winton and underlying units (basin wide) were analyzed. Detrital zircon ages were obtained via U-Pb LA-ICPMS ...