Usno Formation

{{Infobox rockunit

| name = Usno Formation

| image =

| caption =

| type = Geological formation

| age = Pliocene

| period = Gelasian

| prilithology = Sandstone

| namedfor =

| namedby =

| region =

| country = Ethiopia

| coordinates = {{coord|5.3|N|36.0|E|display=inline,title}}

| paleocoordinates = {{coord|5.1|N|35.7|E|display=inline}}

| unitof = Omo Group

| subunits =

| underlies = Kalam Formation

| overlies = Mursi Formation

| thickness =

| extent = Omo Subbasin
 Turkana Basin

| area =

| map = {{Location map+ | Ethiopia

| map_caption =

| relief = 1

| width = 250

| float = center

| places =

{{Location map~ | Ethiopia

| lat_deg = 5.3

| lon_deg = 36.0

| mark = Brown pog.svg

| marksize = 12

}}

}}

}}

The Usno Formation is a palaeontological formation located in Ethiopia. It dates to the Pliocene period.Boaz, N. T., Howell, F. C., & McCrossin, M. L. (1982). Faunal age of the Usno, Shungura B and Hadar Formations, Ethiopia. Nature, 300(5893), 633–635. https://doi.org/10.1038/300633A0