Tetreauville Formation

{{Infobox rockunit

| name = Tetreauville Formation

| age = {{Fossil range|460.9|449|Trentonian}}

| period = Late Ordovician

| image = Tetreauville Formation.jpg

| imagesize =

| caption = Tetreauville Formation outcropping at the base of Mount Royal.

| type = Geological formation

| prilithology = Limestone

| otherlithology = Shale

| region = Quebec

| country = Canada

| coordinates =

| unitof = Trenton Group

| subunits =

| underlies = Utica Shale

| overlies = Montreal Formation

| thickness = Up to {{Convert|168|m|ft|-1}}

| extent =

| area =

| map =

| map_caption =

| namedfor = Tétreaultville

| namedby = T. H. Clark

| year_ts = 1941

}}

The Tetreauville Formation is a geological formation of Upper Ordovician age (Trentonian Stage), extending from the north of Trois-Rivières to the Island of Montreal.{{cite web |title=Tetreauville Formation |url=https://weblex.nrcan.gc.ca/html/015000/GSCC00053015084.html |website=WEBLEX Canada |publisher=Natural Resources Canada |accessdate=24 December 2019}}{{cite web |title=Formation de Tétreauville |url=http://gq.mines.gouv.qc.ca/lexique-stratigraphique/plate-forme-du-saint-laurent/formation-de-tetreauville/ |website=Système d'information géominière du Québec |publisher=Quebec Ministry of Energy and Natural Resources |accessdate=24 December 2019 |language=French}}