Cordell Formation

{{Short description|Geologic formation in Michigan}}

{{Infobox rockunit

| name = Cordell Formation

| image =

| caption =

| type = Formation

| age = Silurian

| period = Silurian

| prilithology =

| otherlithology =

| namedfor =

| namedby =

| region = Michigan

| country = United States

| coordinates =

| unitof = Manistique Group{{cite web|url=https://www.researchgate.net/publication/308697537_Manistique_Group_Reservoirs_in_the_Michigan_Basin_an_Overlooked_Resource |title=Michigan Basin Stratigraphy on ResearchGate}}

| subunits =

| underlies = Rockview Formation

| overlies = Schoolcraft Formation

| thickness =

| extent =

| area =

| map =

| map_caption =

}}

The Cordell Formation is a geologic formation in Michigan. It preserves fossils dating back to the Silurian period.{{cite web|url=https://www.michigan.gov/documents/deq/GIMDL-GSA87E_302407_7.pdf |title=Middle Silurian paleoecology; The Raber Fossil Beds, Chippewa County, Michigan, on Geological Society of America Centennial Field Guide—North-Central Section, 1987 }}