Richmond Formation

{{Short description|Geologic formation in Michigan and Ohio}}

{{Infobox rockunit

| name = Richmond Formation

| image = Flexicalymene meeki caudal.jpg

| caption = Fossil from the Richmond Formation (Ohio)

| type = Formation

| age = Ordovician

| period = Ordovician

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| region = Michigan, Ohio

| country = United States

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The Richmond Formation is a geologic formation in Michigan and Ohio. It preserves fossils dating back to the Ordovician period.