The Carboniferous and Early Permian of the South American Gondwana area.
Reference:
Archangelsky,S. et al. (1980)
The Carboniferous and Early Permian of the South American Gondwana area. Actas del Segundo Congreso Argentino de Paleontologa y Bioestratigrafa y Primer Congreso Latinoamericano de Paleontologa
Vol. 4 P. 257- 269