1. Accomplishments First continent-to-continent conjugate margin images.
Segment-scale variability of crust and lithosphere structure and COB transition along the Gulf.
Alarcon Basin
Integrated upper-mantle and crustal cross section from recent work presented at the RCL-Cortez workshop.

3. What is still unknown?
What boundary conditions controlled the segment-scale response of the lithosphere to rifting?
Subduction system and slab?
Weak lower crust or rigid batholith?
What is the structure of the mantle?
flow pattern?
temperature and viscosity structure?

4. What is Needed?
Better determination of the mantle structure by both regional 3D models and broad transects aligned with active source lines.
Improved knowledge of crustal structure around the onshore margins of the Gulf (Baja, Sonora/Sinaloa, Northern GEP).
These will provide the input parameters and observational constraints for the 3D geodynamical model of rifting in the Gulf.