In Talamanca province on the Caribbean side of Costa Rica, microfauna in strata from the Amoura River a few meters from the mouth of Uscari Creek are lower Miocene in age, and are older than the Uscari formation as it is known from the publications of Olsson and Woodring. Some qualification is suggested as to future correlations with the Uscari formation because of the difference in age between strata of the Uscari-Amoura area in the field (not listed by Olsson or Woodring), and strata in other localities ascribed to the Uscari formation in the literature. The microfauna has a confusing similarity to pre-Miocene forms, but can be correlated with the lower Miocene of California.

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