The following thematic Working Groups reflect the diversity of geological understanding and needs within the Project area:
 

• Aptian/Albian and Albian/Cenomanian Stage Boundaries: E. Koutsoukos

• Cenomanian/Turonian and Turonian/Coniacian Stage Boundaries: P. Bengtson

• Coniacian/Santonian, Santonian/Campanian and Campanian/ Maastrichtian Stage Boundaries: Eduardo Olivero (CADIC, Ushuaia, Argentina)

• Atlas of Cretaceous Carbonate Microfacies: D. Dias-Brito (IGCE-UNESP, Brazil)

• Chemostratigraphic Correlations: René Rodriques (PETROBRAS- CENPES)

• Cretaceous Continental Ecosystems: Ismar Carvalho (UFRJ, Rio de Janeiro, Brazil)

• Dating of the First Marine Transgression: E. Koutsoukos

• K/T Boundary: E. Koutsoukos

• Biochronostratigraphy and Biogeography of Non-Marine Microfossil Assemblages: E. Musacchio (Universidad Nacional de la Patagonia, Comodoro Rivadavia, Argentina)

• Paleogeographical and Paleoclimatical Maps: Antonio J. Vasconcellos Garcia (UNISINOS) and Biostratigraphic Group of PETROBRAS-CENPES

• South Atlantic Evaporites: Peter Szatmari (PETROBRAS-CENPES)

• Regional Tectonics: P. Szatmari

• Biochronostratigraphic Framework for the Mesozoic Successions: biostratigraphic groups of EXXON and PETROBRAS-CENPES.