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THE GEOLOGIC TIME SCALE 2012

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The Geologic Time Scale 2012, winner of a 2012 PROSE Award Honorable Mention for Best Multi-volume Reference in Science from the Association of American Publishers, is the framework for deciphering the history of our planet Earth. The authors have been at the forefront of chronostratigraphic research and initiatives to create an international geologic time scale for many years, and the charts in this book present the most up-to-date, international standard, as ratified by the International Commission on Stratigraphy and the International Union of Geological Sciences. This 2012 geologic time scale is an enhanced, improved and expanded version of the GTS2004, including chapters on planetary scales, the Cryogenian-Ediacaran periods/systems, a prehistory scale of human development, a survey of sequence stratigraphy, and an extensive compilation of stable-isotope chemostratigraphy.

This book is an essential reference for all geoscientists, including researchers, students, and petroleum and mining professionals. The presentation is non-technical and illustrated with numerous colour charts, maps and photographs. The book also includes a detachable wall chart of the complete time scale for use as a handy reference in the office, laboratory or field.

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Author GRADSTEIN, OGG, SCHMITZ & OGG
Table Of Content

Dedication

Quote

Dedication

Contributors

Editors’ Biographies

Preface

Abbreviations and acronyms

Organizations

Time Scale Publications (see References for Details)

Geoscientific Concepts

Symbols

Chapter 1. Introduction

1.1 A Geologic Time Scale

1.2 A Geologic Time Scale GTS2012

1.3 How this Book is Arranged

1.4 Conventions and Standards

1.5 Historical Overview of Geologic Time Scales

1.6 Stratigraphic Charts and Tables

REFERENCES

Chapter 2. The Chronostratigraphic Scale

2.1 History of Geologic Stratigraphic Standardization

2.2 Stage Unit Stratotypes

2.3 Global Boundary Stratotype Section and Point (GSSP)

2.3 Global Standard Stratigraphic Age (GSSA)

2.4 Other Considerations for Choosing a GSSP

2.5 Subdividing Long Stages

2.6 Do GSSP Boundary Stratotypes Simplify Stratigraphic Classification?

REFERENCES

Chapter 3. Biochronology

3.1 Introduction

3.2 Paleontologic Events

3.3 Quantitative Stratigraphy and Biochronology

3.4 Qualitative Biostratigraphy and Biochronology

Acknowledgments

REFERENCES

Chapter 4. Cyclostratigraphy and Astrochronology

4.1 Introduction

4.2 Earth’s Astronomical Parameters

4.3 The 405-kyr Metronome

4.4 Astronomically Forced Insolation

4.5 Cyclostratigraphy through Geologic Time

4.6 Constructing Astrochronologies and the ATS

4.7 Precision and Accuracy of the ATS

4.8 Astrochronology-Geochronology Intercalibration

4.9 A New Astronomical Solution

REFERENCES

Chapter 5. Geomagnetic Polarity Time Scale

5.1 Principles

5.2 Late Cretaceous through Cenozoic Geomagnetic Polarity Time Scale

5.3 Middle Jurassic through Early Cretaceous Geomagnetic Polarity Time Scale

5.4 Geomagnetic Polarity Time Scale for Early Jurassic and Older Rocks

5.5 Summary

REFERENCES

Chapter 6. Radiogenic Isotope Geochronology

6.1 Changes in Geochronological Practice Since a Geological Time Scale 2004

6.2 Changes in Geochronological Standards Applied to the Geological Time Scale 2012

REFERENCES

Chapter 7. Strontium Isotope Stratigraphy

7.1 Introduction

7.2 Materials for Strontium Isotope Stratigraphy

7.3 The Databases Used for this Volume

7.4 Numerical Ages

7.5 Fitting the Lowess Database

7.6 The Quality of the Fit

7.7 Rubidium Contamination

7.8 Comments on the Lowess Fit

7.9 Sr-Isotope Stratigraphy for Pre-Ordovician Time

REFERENCES

Chapter 8. Osmium Isotope Stratigraphy

8.1 Introduction

8.2 Historical Overview

8.3 Pleistocene

8.4 Miocene

8.5 Oligocene

8.6 Late Eocene Impacts

8.7 Early Eocene

8.8 Paleocene

8.9 Cretaceous-Tertiary (K-T) Boundary

8.10 Pre-Cenozoic Records

8.11 Mesozoic

8.12 Paleozoic and Precambrian

REFERENCES

Chapter 9. Sulfur Isotope Stratigraphy

9.1 Introduction

9.2 Mechanisms Driving the Variation in the S Isotope Record

9.3 Isotopic Fractionation of Sulfur

9.4 Measurement and Materials for Sulfur Isotope Stratigraphy

9.5 A Geological Time Scale Database

9.6 A Database of S Isotope Values and Their Ages for the Past 130 Million Years Using Lowess Regression

9.7 Use of S Isotopes for Correlation

REFERENCES

Chapter 10. Oxygen Isotope Stratigraphy

10.1 Introduction

10.2 Terminology and Standardization

10.3 Fractionation Relations and Paleotemperature Scales

10.4 Application Principles and Considerations

10.5 Sample Materials

10.6 Oxygen Isotope Stratigraphy

10.7 Summary

Acknowledgments

REFERENCES

Chapter 11. Carbon Isotope Stratigraphy

11.1 Principles of Carbon Isotope Stratigraphy

11.2 Spatial Heterogeneity of δ13C of Dissolved Inorganic Carbon

11.3 Materials and Methods

11.4 Correlation Potential and Excursions

11.5 Causes of Carbon Isotope Excursions

11.6 Conclusion

Acknowledgments

REFERENCES

Chapter 12. A Brief History of Plants on Earth

1 Introduction

2 Paleozoic

3 Mesozoic

4 Cenozoic

Acknowledgments

REFERENCES

Chapter 13. Sequence Stratigraphy and Sea-Level Change

13.1 Historical Links between Sea-Level Change, Sequence Stratigraphy and the Geological Time scale

13.2 The Development of Eustatic and Sequence Stratigraphic Concepts

13.3 Issues of Terminology

13.4 Uses of Sequence Stratigraphy

13.5 The Synchronicity of Global Sea-Level Changes

13.6 Causality

13.7 Conclusions

Acknowledgments

REFERENCES

Chapter 14. Statistical Procedures

14.1 History

14.2 Spline Fitting in GTS2004

14.3 Modifications in GTS2012

REFERENCES

Chapter 15. The Planetary Time Scale

15.1 Introduction and Methodologies

15.2 Time Scales

REFERENCES

Chapter 16. A Chronostratigraphic Division of the Precambrian: Possibilities and Challenges

16.1 Introduction

16.2 Historical Review

16.3 Precambrian Earth History – A Progress Report

16.4 A Linked, Causative Series of Events in Precambrian Earth Evolution

16.5 A Revised Precambrian Time scale

Acknowledgments

REFERENCES

Chapter 17. The Cryogenian Period

17.1 Historical Background

17.2 Geochronological Constraints on the Cryogenian Climate Record

17.3 The Biostratigraphic Basis for a Cryogenian Period

17.4 An Integrated Approach to Global Stratigraphic Correlation

17.5 Potential Subdivision of the Cryogenian Period

REFERENCES

Chapter 18. The Ediacaran Period

18.1 Historical Background

18.2 Cap Carbonates and the Base of the Ediacaran System

18.3 The Biostratigraphic Basis for the Ediacaran Period

18.4 Towards an Ediacaran Chronostratigraphy

18.5 Ediacaran – Last Period of the Proterozoic or First Period of the Phanerozoic?

REFERENCES

Chapter 19. The Cambrian Period

19.1 History and Subdivisions

19.2 Cambrian Stratigraphy

19.3 Cambrian Time Scale

REFERENCES

Chapter 20. The Ordovician Period

20.1 History and Subdivisions

20.2 Previous Standard Divisions

20.3 Ordovician Stratigraphy

20.4 Ordovician Time Scale

Acknowledgments

REFERENCES

Chapter 21. The Silurian Period

21.1 History and Subdivisions

21.2 Silurian Series and Stages

21.3 Silurian Stratigraphy

21.4 Silurian Time Scale

Acknowledgments

REFERENCES

Chapter 22. The Devonian Period

22.1 History and Subdivisions

22.2 Devonian Stratigraphy

22.3 Devonian Time Scale

REFERENCES

Chapter 23. The Carboniferous Period

23.1 History and Subdivisions

23.2 Carboniferous Stratigraphy

23.3 Carboniferous Time scale

Acknowledgments

REFERENCES

Chapter 24. The Permian Period

24.1 History and Subdivisions

24.2 Regional Correlations

24.3 Permian Stratigraphy

24.4 Permian Time Scale

REFERENCES

Chapter 25. Triassic

25.1 History and Subdivisions

25.2 Triassic Stratigraphy

25.3 Triassic Time scale

Acknowledgments

REFERENCES

Chapter 26. Jurassic

26.1 History and Subdivisions

26.2 Jurassic Stratigraphy

26.3 Jurassic Time scale

Acknowledgments

REFERENCES

Chapter 27. Cretaceous

27.1 History and Subdivisions

27.2 Cretaceous Stratigraphy

27.3 Cretaceous Time Scale

Acknowledgments

REFERENCES

Chapter 28. The Paleogene Period

28.1 History and Subdivisions

28.2 Paleogene Biostratigraphy

28.3 Physical Stratigraphy

28.4 Paleogene Time Scale

Acknowledgments

REFERENCES

Chapter 29. The Neogene Period

29.1 Chronostratigraphy

29.2 Stages

29.3 Biostratigraphy

29.4 Event Stratigraphy

29.5 Radio-Isotopic Ages

29.6 Climate Change and Milankovitch Cycles

29.7 Astronomically Tuned Neogene Time Scale – ATNTS2012

Acknowledgments

REFERENCES

Chapter 30. The Quaternary Period

30.1 Evolution of Terminology

30.2 The Plio–Pleistocene Boundary and Definition of the Quaternary

30.3 Subdivision of the Pleistocene

30.4 Terrestrial Sequences

30.5 Ocean-Sediment Sequences

30.6 Land–Sea Correlation

30.7 Pleistocene–Holocene Boundary

30.8 Holocene Series

30.9 “Anthropocene Series”

30.10 Quaternary Dating Methods

REFERENCES

Chapter 31. The Prehistoric Human Time Scale

31.1 Introduction

31.2 Hominin Phylogeny and Migration Episodes

31.3 The Paleoenvironmental Context of Early Hominin Evolution

31.4 Hominin Industries and the Terminology of Prehistoric Periods

31.5 Early and Mid Pleistocene Technologies

31.6 The earliest technologies of Homo sapiens – The Upper Paleolithic

31.7 Holocene Technologies – Mesolithic, Neolithic, Bronze Age and Iron Age

31.8 Conclusions

Acknowledgment

REFERENCES

Chapter 32. The Anthropocene

32.1 The Anthropocene

32.2 Stratigraphic Signature

32.3 Beginning of the Anthropocene?

32.4 Future Duration of the Anthropocene?

32.5 Formal Consideration of the Anthropocene

32.6 Definition

32.7 Hierarchical Level

Acknowledgments

REFERENCES

APPENDIX 1: Color Codes for Geological Timescales

APPENDIX 2: Radiometric ages used in GTS2012

References Cited

APPENDIX 3: Cenozoic and Cretaceous Biochronology of Planktonic Foraminifera and Calcareous Nannofossils

References

Index

Publish Date 22 Aug 2012
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