Llallagua Formation

{{Infobox rockunit

| name = Llallagua Formation

| image =

| caption =

| type = Geological formation

| period = Homerian

| age = Rhuddanian-Homerian
~{{fossil range|443|428}}

| prilithology = Sandstone

| otherlithology = Shale

| namedfor = Llallagua

| namedby =

| region = Potosí Department

| country = Bolivia

| coordinates = {{coord|17.8|S|64.8|W|display=inline,title}}

| paleocoordinates = {{coord|46.5|S|127.9|W|display=inline}}

| unitof =

| subunits =

| underlies = Kirusillas Formation

| overlies =

| thickness =

| extent = Cordillera Oriental

| area =

| map = {{Location map+ | Bolivia

| relief = 1

| width = 250

| float = center

| places =

{{Location map~ | Bolivia

| lat_deg = -17.8

| lon_deg = -64.8

| mark = SpringGreen pog.svg

| marksize = 10

}}

}}

| map_caption =

}}

The Llallagua Formation is a Rhuddanian to Homerian geologic formation of western Bolivia. The formation comprises siliciclastic sediments. The fossil fauna suggests a warm water, nearshore current was active allowing northern hemisphere benthos to exist in the formation.[https://paleobiodb.org/classic/displayCollResults?collection_no=25084 Llallagua Formation] at Fossilworks.org