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Index Fossils and International Stratotypes

Index Fossils and International Stratotypes. Biostratigraphy and Global Politics. Systems, Series, Stages. Devonian System Upper Devonian Series Famennian Frasnian Middle Devonian Series Givetian Eifelian Lower Devonian Emsian Pragian Lochkovian Silurian System Upper Silurian Series

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Index Fossils and International Stratotypes

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  1. Index Fossils andInternational Stratotypes Biostratigraphy and Global Politics

  2. Systems, Series, Stages • Devonian System • Upper Devonian Series • Famennian • Frasnian • Middle Devonian Series • Givetian • Eifelian • Lower Devonian • Emsian • Pragian • Lochkovian • Silurian System • Upper Silurian Series • Přídolí Stage

  3. Units Definedby Index Fossils • What is an Index Fossil? • Limited Stratigraphic Range • Widespread Geographic Distribution • Commonly Pelagic • Or, tolerant of a wide variety of environments (found in many facies)

  4. Index Fossilsand the S-D Boundary • Graptolites * • Conodonts * • Chitinozoans * • Trilobites • Brachiopods • Cephalopods

  5. Definition ofthe S-D Boundary • GSSP: Global Stratotype Sequence and Point • Point chosen as first appearance of the graptolite Monograptus uniformis uniformis • Auxiliary index species – the conodont Icriodus woschmidti woschmidti • Stratotype: Klonk, near Suchomasty, Czech Republic • Auxiliary Stratotype: Budňanská Skála/Karlštejn

  6. Definition ofthe S-D Boundary Stratotype: Klonk, near Suchomasty, Czech Republic

  7. S-D GSSP • First appearance of Monograptus uniformis uniformis • Bed 20 • Klonk, Czechia

  8. Preserving the GSSP Dr. Ivo Chlupáč

  9. Auxiliary Stratotype: Budňanská Skála/Karlštejn

  10. Přídolí Stratotype: Požáry

  11. Pragian Stratotype:Velká Chuchle

  12. Why does it matter? • Precise correlations • Precise timing for inter-regional comparisons • Time frame for discerning global events

  13. Ranges of Conodontsnear the S-D Boundary

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