In the median part of the Rif Belt (Mesorif Zone), Upper Jurassic-Lower Cretaceous deposits contain numerous relics of volcanic materials (basalt pebbles and interstratified lava flows), and several large gabbro massifs, especially in the Central Mesorif. The most important of these massifs, Bou Adel, was regarded as an intrusive gabbro of varying age (according to successive authors: Barremian, Late Jurassic to Senonian, and Bathonian respectively), and recently as an oceanic gabbro of latest Jurassic-earliest Cretaceous. Based on a radiometric (190±2 Ma) date from zircon grains, Michard et al. (2018) ascribed an Early Jurassic (Liassic) age to this gabbro. Consequently these authors proposed a new interpretation of the oceanic opening of the External Rif Domain related to the eastwards expansion of the Central Atlantic oceanic rift. They also hypothesized that the Upper Jurassic-Lower Cretaceous volcanic lavas and the ophiolite complexes of the Mesorif Zone are heterochronous and correspond to two, distinct and separated in time, magmatic events. This new age ascribed to the Bou Adel gabbro and the new interpretation of the oceanic opening of the External Rif disagree with the stratigraphic data and the geodynamic framework of the External Rif domain during the Mesozoic. On the base of numerous stratigraphic data and the palaeogeographic evolution, we evidence herein that the volcanic lavas and the oceanic gabbros of the Mesorif Zone all originated from the same geodynamic event related to the westwards expansion of the Tethys Ocean at the Jurassic-Cretaceous boundary, and that these oceanic gabbros are ophiolite complexes of the Senhadja and Bou Haddoud nappes, thrusted over the External Mesorif Zone during the Alpine Miocene orogeny.