Considerations about the current state of Tertiary stratigraphy in Colombia Jaime De Porta 5-43 PDF (Español (España))
Interference directions in the Cretaceous-Tertiary folds between Coello and Gualanday. N Tellez, J Navas 45-61 PDF (Español (España))
Biometric verification Codakia orbicularis and Codakia orbiculata species Fernando Etayo Serna 63-67 PDF (Español (España))
Discussion about the ages of the Hoyón, Gualanday and La Cira formations in the region of Honda -San Juan de Ríoseco Jaime De Porta, N Sole De Porta 69-85 PDF (Español (España))
