Late Burdigalian (Miocene) age for pectinids for pectinids (Mollusca-Bivalvia) from the Pirabas Formation (northern Brazil) derived from Sr-isotope (87Sr/86Sr) data

MARTINEZ, S.; FEIJO RAMOS, M. I.; MCARTHUR, JOHN; DEL RÍO CLAUDIA JULIA

NEUES JAHRBUCH FUR GEOLOGIE UND PALAONTOLOGIE-ABHANDLUNGEN

E SCHWEIZERBARTSCHE VERLAGS

Lugar: Stuttgart; Año: 2017 vol. 284 p. 57 - 64

0077-7749

The highly fossiliferous Pirabas Fm. represents the southern part of "Neogene Tropical America", a biogeographical unit developed prior to the closure of the Central American Seaway by the isthmus of Panama. Until now, the age of the Pirabas Fm was inferred only by biostratigraphy. The Sr-isotope ( 87Sr/86 Sr) values of pectinid shells obtained by us show that most parts of this unit were deposited during the late Burdigalian (about 16-17 ma ). This result do not contradict biostratigraphic data, whilst constraining the age of the Pirabas Fm. more tightly, allowing future more precise biogeographical comparisons.