Brigus Formation

{{Infobox rockunit

| name = Brigus Formation

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| type = Formation

| period = Cambrian

| age = {{Geological range | Stage 4 |refs=Hiscott, R. N. 1982: Tidal deposits of the Lower Cambrian Random Formation, eastern Newfoundland; facies and paleoenvironments. Canadian Journal of Earth Sciences 19:2028–2042.}} (Latest Lower Cambrian){{citation |first=Terence P. |last=Fletcher |location=St. John’s, Newfoundland |editor-first=C.P.G. |editor-last=PEREIRA |publisher=Newfoundland. Government of Newfoundland and Labrador, Geological Survey, Department of Natural Resources|url=http://www.nr.gov.nl.ca/nr/mines/geoscience/publications/report06_02.pdf |id=Report 06-02 |title=Bedrock geology of the Cape St. Mary’s Peninsula, southwest Avalon Peninsula, Newfoundland (includes parts of NTS map sheets 1M/1, 1N/4, 1L/16 and 1K/13) |date=2006 |access-date=July 21, 2024}}

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| region = Newfoundland and Labrador

| country = Canada

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| unitof = Adeyton Group

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| underlies = Chamberlain's Brook Formation

| overlies = Smith Point Fm, Fosters Point Formation{{Cite journal|doi=10.1016/0301-9268(94)00074-2|title=Neoproterozoic rocks of the Newfoundland Avalon Zone|journal=Precambrian Research|volume=73|pages=123–136|year=1995|last1=Myrow|first1=P|issue=1–4 |bibcode=1995PreR...73..123M}}

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The Brigus Formation is a fossiliferous (e.g. trilobitesNormore, L. S. 2012: GEOLOGY OF THE RANDOM ISLAND MAP AREA (Nts 2C/04), Newfoundland. Current Research (2012) Newfoundland and Labrador Department of Natural Resources Geological Survey Report 12-:121–145.) upper lower Cambrian geologic formation in Newfoundland and Labrador.

It comprises a series of deep red nodular mudstones, with some prominent grey limestone beds.