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Lost Branch Formation

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Contents

Abstract

Introduction

Depositional controls

Purpose

Origin and evolution of previous nomenclature

Earliest work

Revised correlations

Hepler sandstone

Lenapah Limestone

New findings

Age of the Dawson coal

Relations of the Lenapah Limestone

Recorrelation of northern "Lenapah" limestones

Desirability of a new named formation

Lost Branch Formation

Type locality and stratotype

Component units

Sni Mills Limestone Member

Cooper Creek Limestone Member

Homer School limestone bed

Nuyaka Creek black shale bed

Glenpool limestone bed

Contacts

Basis for correlation

Conodonts

Ammonoids

Palynomorphs

Fusulinids

Desmoinesian-Missourian boundary

Memorial Shale (revised)

Overlying strata

Hepler unit

South Mound shale

Depositional history

Lenapah transgressions

Upper Memorial regression

Early Lost Branch transgression

Late Lost Branch transgression

Maximum Lost Branch transgression

Early Lost Branch regression

Late Lost Branch regression

Maximum Hepler regression

Possible cause of terminal Desmoinesian extinctions

Comparison of the Lost Branch Formation with other marine formations

Conclusions

References

Appendix

Sections for figure 8

Sections for figure 9


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Kansas Geological Survey, Geology
Placed on web Nov. 2, 2010; originally published 1991.
Comments to webadmin@kgs.ku.edu
The URL for this page is http://www.kgs.ku.edu/Publications/Bulletins/GS4/01_contents.html