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Foraminifera of the Cenomanian-Turonian Boundary Interval, Greenhorn Formation, Rock Canyon Anticline, Pueblo, Colorado

By
R. Mark Leckie
R. Mark Leckie
Department of Geology and Geography
University of Massachusetts
Amherst, Massachusetts
01003
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Published:
January 01, 1985

Abstract

Seventeen samples bracketing the Cenomanian -Turonian stage boundary in the Bridge Creek Limestone (Greenhorn Formation), Pueblo, Colorado, were analyzed for planktonic and benthic foraminifera. A major turnover in the biostratigraphically important, deep-dwelling planktonic foraminifera occurred across this boundary. The Cenomanian rotaliporids were succeeded by the Turonian globotruncanids, perhaps due in part to dynamic global oceanographic developments including the expansion of an oceanic oxygen-minimum zone. Shallow-dwelling planktonic foraminifera on the other hand, were strongly influenced by regional factors (e.g. salinity) affecting the uppermost water column of the Greenhorn sea.

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Contents

SEPM Field Trip Guide

Fine-Grained Deposits and Biofacies of the Cretaceous Western Interior Seaway: Evidence of Cyclic Sedimentary Processes

Lisa M. Pratt
Lisa M. Pratt
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Erle G. Kauffman
Erle G. Kauffman
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Frederick B. Zelt
Frederick B. Zelt
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SEPM Society for Sedimentary Geology
Volume
4
ISBN electronic:
9781565762794
Publication date:
January 01, 1985

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