Prosser Limestone

{{Short description|Geologic formation in the US}}

{{Infobox rockunit

| name = Prosser Limestone

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| type = Formation

| age = Ordovician

| period = Ordovician

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| region = Illinois, Wisconsin, Iowa, Manitoba

| country = United States, Canada

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| subunits = Clitambonites Member

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The Prosser Limestone is a geologic formation in Illinois, USA. It preserves fossils dating back to the Ordovician period.