North American Commission on Stratigraphic Nomenclature
Report 12
Robert M. Easton, Lucy E. Edwards, Randall C. Orndorff, Manuel Duguet, and Ismael Ferrusquia-Villafranca.
StratigraphyVolume 13, No. 3
pp. 220-222
- online
Revision of Article 37, Lithodemic Units, of the North American Stratigraphic Code