Palynology and paleobotany of the Early Pliocene section Rio Frio 17 (Cordillera Oriental, Colombia): Biostratigraphical and chronostratigraphical implications.
Reference:
Wijninga,V.M. (1996)
Palynology and paleobotany of the Early Pliocene section Rio Frio 17 (Cordillera Oriental, Colombia): Biostratigraphical and chronostratigraphical implications. Review of Palaeobotany and Palynology
Vol. 92 # 3 P. 329- 350