Silva-Tamayo et al., 2016 - Valanginian of Colombia

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Silva-Tamayo, J. C., Ramirez, C., Lara, M., Sial, A. N., Trujillo, D., & Salazar, E. (2016) Sedimentology and chemostratigraphy of a Valanginian carbonate succession from the Baja Guajira Basin, northern Colombia // Brazilian Journal of Geology, Vol.46(Suppl 1). P.163-180.

http://www.scielo.br/pdf/bjgeo/v46s1/23 ... -00163.pdf