Long Lake Limestone

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{{Infobox rockunit

| name = Long Lake Limestone

| image =

| caption =

| type = Formation

| age = Middle Devonian

| period = Middle Devonian

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| region = Michigan

| country = United States

| coordinates =

| unitof = Traverse Group

| subunits = Killians Member and Genshaw Member

| underlies = Alpena Limestone

| overlies = Ferron Point Formation

| thickness =

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The Long Lake Limestone is a geologic formation in Michigan. It preserves fossils dating back to the Devonian period.

{{Portal|Earth sciences|Michigan|Paleontology}}