Barreda, V. D. (1993). Late Oligocene?–Miocene pollen of the families Compositae, Malvaceae and Polygonaceae from the Chenque formation, Golfo San Jorge Basin, southeastern Argentina. Palynology. 17(1): 169-186.
Late Oligocene?–Miocene pollen of the families Compositae, Malvaceae and Polygonaceae from the Chenque formation, Golfo San Jorge Basin, southeastern Argentina