Table of Contents - SPE290: The Ordovician Deicke and Millbrig K-bentonite Beds of the Cincinnati Arch and Southern Valley and Ridge Province

Abstract

Introduction and Purpose

Methods

Geologic Setting

Petrography

Introduction
Nonclay Mineralogy Feldspars
Fe and Fe-Ti Minerals Quartz
Biotite
Accessory Minerals

Clay Mineralogy

Mixed-Layer Illite/Smectite
Other Clays
Color

Petrology and Petrogenesis

Introduction
Nature of the Original Ashes
Volume and Areal Extent of the Original Ashes
Setting of the Source Volcanoes
Is the Millbrig the "Big Bentonite" of Kinnekulle?

Diagenesis

Introduction
Feldspars
Clay Minerals
Fe and Fe-Ti Minerals
Discussion
Summary of Burial History

Stratigraphy and Correlation

Introduction
Absolute Age of the Deicke and Millbrig
The Rocklandian: Middle or Late Ordovician?
Correlation Along the Cincinnati Arch
Previous Studies
Discussion Correlation from the Cincinnati Arch to the Valley and Ridge
Previous Studies
Discussion Correlation Along Strike in the Valley and Ridge
Previous Studies
Discussion Correlation Across Strike in the Valley and Ridge
Previous Studies
Discussion

Stratigraphic Value of the Deicke and Millbrig

Introduction
Sequence Stratigraphy and Unconformities
Comparison of K-Bentonite Lithostratigraphy with Conodont Biostratigraphy

Summary and Conclusions

Acknowledgments

Appendix 1: Sample Locality Information and Analytical Methods

References Cited