<p>This study investigates the Upper Cretaceous Muti Formation, exposed in isolated outcrops around the Jabal Akhdar Dome, which was deposited within a tectonically active marine foreland basin along the northeastern margin of the Arabian Plate during syn-obduction. Detailed sedimentological analyses were carried out using measured stratigraphic sections, lithofacies and microfacies analysis, and petrographic examination of carbonate and siliciclastic components from ten sections across the northern, northeastern and southern parts of the dome. The Muti Formation comprises four lithofacies associations; (1) limestone, (2) conglomerate-breccia, (3) claystone and (4) ferruginous claystone, encompassing ten lithofacies and ten carbonate microfacies ranging from mudstone to packstone. Facies assemblages indicate deposition in mid- to outer-shelf, slope and basinal marine environments, dominated by pelagic to hemipelagic carbonate sedimentation. Detrital components, chiefly quartz with subordinate clay minerals and heavy minerals, record sustained siliciclastic input from mixed continental and platform sources, with an upward increase reflecting progressive basin evolution. Spatial facies variations and thickness changes document asymmetric foreland basin development controlled by thrust loading, differential subsidence and syndepositional faulting. Initial sedimentation was concentrated along the northeastern margin of the basin, whereas southern sections record deeper-water deposition during later stages. Collectively, the results demonstrate that the Muti Formation preserves a facies-based record of Late Cretaceous foreland basin evolution, marking the transition from carbonate-dominated sedimentation to a mixed carbonate-siliciclastic system driven by syn-obduction tectonics and high sea level.</p>