Introductory talk to JK2018, the International Symposium around the Jurassic - Cretaceous Boundary (Muséum d'Histoire naturelle de Genève - CH, December 5-7, 2018)

2. Members of the Organizing Committee
• Prof. Rossana MARTINI, Université de Genève, Switzerland
• Dr Lionel CAVIN, Muséum d'Histoire naturelle (MHN) de Genève, Switzerland
• Prof. Jean J. CHAROLLAIS, Université de Genève, Switzerland
• Prof. Bruno R.C. GRANIER, Université de Bretagne Occidentale, France (President)
• Dr Christian MEISTER, Muséum d'Histoire naturelle de Genève, Switzerland
• Dr Eric MONTEIL, Muséum d'Histoire naturelle (MNH) de Genève, Switzerland
• Dr André PIUZ, Muséum d'Histoire naturelle (MHN) de Genève, Switzerland
• Prof. Andreas STRASSER, University of Fribourg, Switzerland

3. Members of the Scientific Committee
• Prof. Beatriz AGUIRRE-URRETA, Instituto de Estudios Andinos Don Pablo
Groeber Universidad de Buenos Aires - CONICET, Argentina
• Dr Cinzia BOTTINI, Università degli Studi di Milano, Italy
• Dr Špela GORIČAN, ZRC SAZU, Slovenia
• Dr François ATROPS, CNRS, Université Claude Bernard (Lyon 1), France
• Dr Evgenij BARABOSHKIN, Moscow State University, Russian Federation
• Prof. Mohamed BENZAGGAGH, Université Moulay Ismail - Meknès, Morocco
• Dr Eric BUFFETAUT, CNRS, France
• Prof. Miguel COMPANY SEMPERE, Universidad de Granada, Spain
• Prof. Raymond ÉNAY, Université Claude Bernard (Lyon), France
• Dr Mohssine ETTACHFINI, Université Cadi Ayyad, Marrakesh, Morocco
• Dr Jacek GRABOWSKI, Polish Geological Institute - National Research Institute,
Poland
• Prof. Bruno R.C. GRANIER, Université de Bretagne Occidentale, France
• Prof. Malcolm B. HART, Plymouth University, United Kingdom
• Dr Hartmut JÄGER, GeoResources STC, Germany
• Prof. Mikheil KAKABADZE, I. Javakhishvili Tbilisi State University, Georgia

4. Members of the Scientific Committee
• Prof. Jaap KLEIN, Naturalis Biodiversity Center, Netherlands
• Dr Stephen LOKIER, Bangor University, United Kingdom
• Dr Carles MARTÍN-CLOSAS, Universitat de Barcelona, Spain
• Dr Mathieu MARTINEZ, Université de Rennes 1, France
• Prof. Atsushi MATSUOKA, Niigata University, Japan
• Dr Eric MONTEIL, Muséum d'Histoire naturelle (MNH) de Genève, Switzerland
• Prof. James G. OGG, Purdue University, United States
• Dr Mikhail A. ROGOV, Геологический Институт, Российская Академия Наук, Russian
Federation
• Jean-Loup RUBINO, Total, France
• Prof. Mariusz A. SALAMON, Uniwersytet Śląski, Poland
• Dr Christian SALAZAR, Universidad del Desarrollo, Chile
• Dr Robert W. SCOTT, The University of Tulsa, United States
• Dr Mike SIMMONS, Halliburton, United States
• Prof. Andreas STRASSER, University of Fribourg, Switzerland
• Prof. Helmut J. WEISSERT, ETH Zürich, Switzerland
• Prof. Ismail Omer YILMAZ, Middle East Technical University (Ankara), Turkey

5. Scientific Partners
• Asociación Paleontológica Argentina (APA)
• Association Paléontologique et Évolutive Libanaise (APEL)
• Association Paléontologique Française (APF)
• Carnets de Géologie (Association)
• Comité Suisse de Stratigraphie (strati.CH)
• International Association of Sedimentologists (IAS)
• International Research Group on Ostracoda (IRGO)
• International Subcommission on Stratigraphic Classification (ISSC)
• Karen CARR Studio
• Sociedad Española de Paleontología (SEP)
• Società Paleontologica Italiana (SPI)
• Societatea Paleontologilor din România (SPR)
• Society for Sedimentary Geology (SEPM)
• Stratigraphy, Sedimentology and Palaeontology (SSP) - European
Geosciences Union (EGU)
• The Paleontological Society
• Меловая комиссия МСК (Russian "Cretaceous Commission")
• Юрская комиссия МСК (Russian "Jurassic Commission")

7. 2 Grants (out of 4)
• Damian Gerard LODOWSKI
• Sibelle MAKSOUD

8. VSI: Jurassic-Cretaceous Transition
Bispiraloconulus serbiacus gen. et sp. nov., a
giant arborescent benthic foraminifer
from the Berriasian of Serbia
Short communication: Felix
Schlagintweit, Ioan I. Bucur, Milan N.
Sudar, p. 98-106
Dual biozonation scheme (benthic
foraminifera and “calcareous” green
algae) over the Jurassic–Cretaceous
transition. Another plea to revert the
system boundary to its historical
Orbigny's and Oppel's definition
Research article: Bruno Granier, p. 245-
274

9. Bernard CLAVEL
(7 juillet 1938 – 30 octobre 2018)
in memoriam

10. The question(s):
•When did the Jurassic end?
•When did the Cretaceous start?

11. Karen Carr

15. Ammonites
as primary markers

16. 0
4
8
12
16
20
24
28
32
36
40
44
48
52
56
60
64
68
72
76
80
84
Jacob/Grandis Grandis Occitanica Boissieri Pertransiens no opinion
Results of the 1975 ballot

17. 0
4
8
12
16
20
24
28
32
36
40
44
48
52
56
60
64
68
72
76
80
84
Jacob/Grandis + Zone B Grandis Occitanica Boissieri Pertransiens no opinion
?
Results of the 1975 ballot (Were they biased?)

18. Valanginian WG
Berriasian WG
Calpionellids
as primary markers
?? Ryazanian

19. The question(s):
•When did the Jurassic end?
•When did the Cretaceous start?
Note:
We cannot question the positions of the Working Groups
but anybody having a different opinion will be given a voice here
in this open debate!

20. Of course, one still expects the system boundary
will coincide with a biological crisis!

21. Moving from Tethys-centered …

22. … to a more global image

23. Moving from the basins only …
© http://www.ammonites.fr/Fiches/0371.htm

24. … to their borders and to the lands

25. Moving from biostratigraphy
(ammonites and calpionellids mostly) …
GTS2012

26. … to other disciplinary groups and fields
GTS2012

27. Jürgen REMANE (1991)
“The choice of boundary level depends primarily on its
correlation potential.
This would put an end to fruitless discussions about whether
Berriasian faunas are Jurassic or Cretaceous.
(…)
Continuity of usage is another important factor.
For this reason the efforts of the International Working
Group on the Jurassic-Cretaceous Boundary have been
concentrated on the Tethysian-Boreal correlation of the
Tithonian-Berriasian boundary,
though so far with limited success.
Other levels should be tested in future.”

28. Jürgen REMANE (1991)
“Other levels should be tested in future”
Twenty-seven (27) years later, some people say:
“Other levels should be tested …
starting from today!”