Harding Sandstone

{{Short description|Geologic formation in Colorado, US}}

{{Infobox rockunit

| name = Harding Sandstone

| image =

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| type = Formation

| age = Ordovician

| period = Ordovician

| prilithology = Sandstone

| otherlithology = Siltstone, shale

| namedfor = Harding’s quarry, Fremont County

| namedby = Charles D. Walcott (1892)

| region = Central Colorado

| country = {{USA}}

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| underlies = Fremont Formation

| overlies = Manitou Limestone

| thickness = {{convert|26|to|46|m|ft|abbr=on}}

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The Harding Sandstone is a geologic formation in Colorado. It preserves fossils dating back to the Ordovician period.