Monje-Dussán, C., Martínez, C., Escapa, I. and Madriñán, S. 2016. NEW RECORDS OF FERNS AND CONIFERS FROM THE LOWER CRETACEOUS IN THE UPPER MAGDALENA VALLEY BASIN, COLOMBIA. Boletín de Geología. 38, 4 (Oct. 2016), 29–42. DOI:https://doi.org/10.18273/revbol.v38n4-2016002.