Nautilus clarkanus

{{Speciesbox

| name = "Nautilus" clarkanus

| fossil_range = Carboniferous

| image = Nautilus clarkanus.jpg

| genus = Nautilus

| species = clarkanus

| authority = Hall, 1858

|extinct=yes

}}

"Nautilus" clarkanus is an extinct species of nautiloid. It lived during the Lower Carboniferous. Fossil specimens have been uncovered in the Spergen Hill Limestone formation of Indiana.

References

[http://digitallibrary.amnh.org/dspace/bitstream/2246/1695/1/B001a05.pdf On the Fauna of the Lower Carboniferous limnestones of Spergen Hill, Ind., with a revision of the descriptions of its Fossils hitherto published, and illustrations of the species from the original type series]