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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 26 (1942)

Issue: 10. (October)

First Page: 1647

Last Page: 1655

Title: Amoura Shale, Costa Rica

Author(s): Paul P. Goudkoff (2), William W. Porter II (3)

Abstract:

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 or Oligocene in age, and are older than the Uscari formation as it is known from the publications of Olsson and Woodring. Some qualification is suggested about 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 marked affinity to that from Manta, Ecuador, and also to that of the Zemorrian stage of the California Miocene.

Another faunule from the Pacific side found on the end of the Nicoya Peninsula between Cape Blanco and Ballena Bay represents littoral sediments of Miocene age, probably younger than the beds sampled on the Amoura River.

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