Bobcaygeon Formation

{{Short description|Geologic formation in Ontario}}

{{Infobox rockunit

| name = Bobcaygeon Formation

| image = Bobcaygeon_Formation.jpg

| caption = Bobcaygeon Formation outcropping in Fenelon Falls.

| type = Formation

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

| period = Late Ordovician

| prilithology = Limestone

| otherlithology =

| namedfor = Bobcaygeon

| namedby = B.A. Liberty

| year_ts = 1969

| region = Ontario

| country = Canada

| coordinates =

| unitof = Simcoe Group

| subunits = Three members (units C, D, and E)

| underlies = Verulam Formation

| overlies = Gull River Formation

| thickness = Up to {{Convert|91|m|ft|-1}}

| extent =

| area =

| map =

| map_caption =

}}

The Bobcaygeon Formation is a geologic formation in Ontario. It preserves fossils dating back to the Ordovician period.