Neogene molluscs, shallow marine paleoenvironments, and chronostratigraphy of the Guajira Peninsula, Colombia

Swiss Journal of Palaeontology

Table 10 Estimated age of principal vertebrate-bearing assemblages in the Jimol and Castilletes formations

Assemblage	Section	Locality	Height (m)	Extrapolated age (Ma)	Direct ages (Ma)
Paraguachón (lower)	290432	390091	−55	17.0	17.05 (same level) 17.19, 17.45 (5 m below)
Paraguachón (middle)	290432	390092	−32	16.9	17.33, 17.45 (10 m below)
Patajau Norte (lower)	430103	470058	25	16.6	n/a
Patajau Norte (middle)	430103	470066	46	16.5	16.07, 16.22, 16.31, 16.33 (2 m above)
Kaitamana	430118	290666, 290085, 430053	41–55^a	n/a	16.10, 16.91 (approx. level)
Paraguachón (upper)	290423	390090, 470065	46–49^a	n/a	15.08, 15.42, 15.52, 16.21 (same level)
Patajau Norte (upper)	430103	290612	78	16.3	n/a
Yotojoro	430203	490006	128	16.0	n/a
Macaraipao	170514	390093	279	15.1	15.14, 15.27, 15.29, 15.39, 15.43 (3–4 m below)

Extrapolated ages are derived from the calibrated age model (where sections are confidently correlated with composite stratigraphy). Direct ages include ⁸⁷Sr/⁸⁶Sr isotope dates from horizons <10 m above or below vertebrate assemblage
^aFaulted blocks within Cocinetas Basin that are only approximately correlated to the composite stratigraphic column; ages are therefore not extrapolated on the basis of stratigraphic height. Section and locality numbers are detailed in Moreno et al. (2015) and can be searched in the STRI Geological Sample Database (http://biogeodb.stri.si.edu/jaramillo/fossildb)