Bond Formation

{{Short description|Geologic formation in Illinois}}

{{Infobox rockunit

| name = Bond Formation

| image = Erisocrinus typus back.jpg

| caption = Erisocrinus fossil from the Bond Formation

| type = Formation

| age = Pennsylvanian

| period = Pennsylvanian

| prilithology =

| otherlithology =

| namedfor =

| namedby =

| region = Illinois, Kentucky and Indiana

| country = United States

| coordinates =

| unitof = McLeansboro Group

| subunits = Lasalle Limestone Member

| underlies = Mattoon Formation

| overlies = Patoka Formation

| thickness =

| extent =

| area =

| map =

| map_caption =

}}

File:Illinois Basin Pennsylvanian stratigraphy.jpg

The Bond Formation is a geologic formation in Illinois, Kentucky and Indiana. It preserves fossils dating back to the Carboniferous period.