Gallatin Formation

{{Short description|Geologic formation in Wyoming and Montana}}

{{Infobox rockunit

| name = Gallatin Formation

| image =Gallatin Fm faulted.jpg

| caption =Gallatin Formation with fault on the south side of the Big Horn Mountains

| type = Formation

| age = Cambrian

| prilithology = Limestone

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| region = Wyoming, Montana

| country = United States

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| underlies = Bighorn Dolomite

| overlies = Gros Ventre Formation

| thickness = 180-300 feet

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The Gallatin Formation is a geologic formation in Wyoming and Montana. It preserves fossils dating back to the Cambrian period.