Twitya Formation

{{Short description|Stratigraphic Unit in Northwest Territories, Canada}}

{{Infobox rockunit

| name = Twitya Formation

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| type = Formation

| period = Cryogenian

| age = Cryogenian {{long fossil range|662.4|ref ={{cite journal |last1=Rooney |first1=Alan D. |last2=Macdonald |first2=Francis A. |last3=Strauss |first3=Justin V. |last4=Dudás |first4=Francis Ö. |last5=Hallmann |first5=Christian |last6=Selby |first6=David |title=Re-Os geochronology and coupled Os-Sr isotope constraints on the Sturtian snowball Earth |journal=Proceedings of the National Academy of Sciences |date=7 January 2014 |volume=111 |issue=1 |pages=51–56 |doi=10.1073/pnas.1317266110|hdl=1721.1/89082 |hdl-access=free }}}}

| prilithology = Cap carbonate

| otherlithology = Mudstone, Siltstone, Shale, Sandstone

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| region = Northwest Territories

| country = Canada

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| unitof = Hay Creek Group

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| underlies = Keele Formation

| overlies = Shezal Formation

| thickness = 900 m (2,952 ft){{cite journal |last1=Narbonne |first1=G |last2=Aitken |first2=J |title=Neoproterozoic of the Mackenzie Mountains, northwestern Canada |journal=Precambrian Research |date=May 1995 |volume=73 |issue=1-4 |pages=101–121 |doi=10.1016/0301-9268(94)00073-Z}}

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The Twitya Formation is a geologic formation in Canada’s Northwest Territories. It mainly consists of cap carbonate rocks, shales and Sandstone-siltstone, with finely laminated mudstone and siltstones. It preserves fossils dating back to the Cryogenian period.