Note 68 — J. E. MARR, M.A., F.R.S. (continued 3)
Reading edition
For an account of the Olenellus fauna see Walcott, C. D., "The Fauna of the Lower Cambrian or Olenellus Zone," Tenth Annual Report of the Director of the United States Geological Survey, Washington, 1890. It is possible that some of the fossils mentioned in that report belong to strata above that containing Olenellus.