Rolling Downs Group

{{Use Australian English|date=May 2024}}

{{Infobox rockunit

| name = Rolling Downs Group

| period = Cretaceous

| age = Mid Barremian-Early Turonian
~{{fossilrange|127|90}}

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| type = Group

| prilithology = Mudstone, siltstone, sandstone

| otherlithology = Limestone, claystone

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| subunits =

• Griman Creek Formation
• Manuka Subgroup

:* Winton Formation

:* Mackunda Formation

• Wilgunya Subgroup

:* Allaru Formation

:* Toolebuc Formation

:* Wallumbilla Formation

• Marree Subgroup

:* Bellinger Sandstone

:* Bulldog Shale

:* Coorikiana Sandstone

:* Oodnadatta Formation

| underlies = Quaternary Lake Eyre Basin sediments

| overlies = Cadna-Owie Formation, Bungil Formation

| thickness = up to {{Convert|1200|m|ft|abbr=on}}

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| coordinates = {{coord|22.6|S|143.0|E|display=inline,title}}

| region = New South Wales
Queensland
South Australia

| country = Australia

| extent = Eromanga & Surat Basins

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The Rolling Downs Group is a stratigraphic group present in the Eromanga and Surat Basins in eastern Australia,{{cite web |url= http://dbforms.ga.gov.au/pls/www/geodx.strat_units.sch_full?wher=stratno=16267|title= Rolling Downs Group|last= |first= |date= |publisher= Geoscience Australia and Australian Stratigraphy Commission|work = Australian Stratigraphic Units Database|access-date= 20 August 2018|quote=}} which was deposited between the mid Barremian to early Turonian of the Cretaceous period. It primarily consists of nearshore shallow marine sediments deposited in the Eromanga Sea, though the uppermost and terminal members, the Winton Formation and the Griman Creek Formation represents freshwater deposits. It is notable for its fossil content including many dinosaurs and mammals, as well as opal. A relict species of dicynodont was suggested to have been found in these rocks,{{Cite journal|last=Thulborn|first=Tony|last2=Turner|first2=Susan|date=2003-05-07|title=The last dicynodont: an Australian Cretaceous relict|journal=Proceedings of the Royal Society of London B: Biological Sciences|volume=270|issue=1518|pages=985–993|doi=10.1098/rspb.2002.2296|issn=0962-8452|pmc=1691326|pmid=12803915}} but is more likely to be misidentified pieces of a Cenozoic marsupial from younger sediments.{{Cite journal|last=Knutsen|first=Espen M.|last2=Oerlemans|first2=Emma|date=September 2019|title=The last dicynodont? Re-assessing the taxonomic and temporal relationships of a contentious Australian fossil|journal=Gondwana Research|volume=77|pages=184–203|doi=10.1016/j.gr.2019.07.011|doi-access=}}