Mourier, T. & Bengtson, P. & Bonhomme, M. & Buge, E. & Cappetta, H. & Crochet, J.-Y. & Feist, M. & Hirsch, K.F. & Jaillard, E. & Laubacher, G. & Lefranc, J.P. & Moullade, M. & Noblet, C. & Pons, D. & Rey, J. (1988)
The Upper Cretaceous - Lower Tertiary marine to continental transition in the Bagua basin, northern Peru. Paleontology, biostratigraphy, radiometry, correlations.
Newsletters on Stratigraphy, 19(3), 143–177