Unravelling the stratigraphy and sedimentation history of the uppermost Cretaceous to Eocene sediments of the Kuching Zone in West Sarawak (Malaysia), Borneo

•Fore-arc basin sedimentation (Pedawan Formation) terminated in the Santonian.•Sedimentation resumes with the fluvio-deltaic Kayan Group in the Maastrichtian.•Unconformably overlain by the Middle to Late Eocene fluvio-marine Ketungau Group.•Paleocurrent measurements indicate sources from the south (Schwaner Mountains area)•Additional sources include West Borneo, Sundaland and Mesozoic melanges in the east.