A new proposal for the Late Cretaceous-Eocene evolution of the westernmost Tethys in the frame of the Africa-Eurasia convergence. A: Southeast-ward subduction of the Tethyan slab beneath Africa during Late Cretaceous-Paleocene times. The width of the Maghrebian Ocean is a conservative estimate intermediate between those suggested by Frizon de Lamotte et al. (2011) and Handy et al. (2010), ∼200 km and ∼700 km, respectively. B: After the middle-late Eocene Subduction Polarity Reversal; subduction of the slab beneath the Alkapeca orogenic arc and back-arc opening of the West-Algerian Mediterranean basin.