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The Talara Basin in northwestern Peru includes two Paleogene lithostratigraphic units: the Mogollon Formation and the Talara Group. For many years the age of the Mogollon Formation was not clearly defined because of its poor micropaleontologic content, including mainly benthic foraminifera, though there have been some efforts to apply local nannofossil zonations.

To help clarify the age of these units, a quantitative study was undertaken of the distribution of calcareous nannofossils contained in samples from eight wells drilled in the Talara Basin. The wells analyzed contained late, middle, and early Eocene nannofossils (zones CP9 to CP15). The middle Eocene calcareous nannofossils show significant variation through time. The relative abundance of warm-water versus cool-water taxa provides a useful proxy when interpreting middle Eocene surface water temperature. These variations may be related to paleoclimatic changes or to the influence of Andean tectonic activity.

Geologic Problem Solving with Microfossils: A Volume in Honor of Garry D. Jones

SEPM Special Publication No. 93, Copyright © 2009

SEPM (Society for Sedimentary Geology), ISBN 978-1-56576-137-7, p. 287–291.

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