The Bhannes Formation, a basalt complex that also includes shale, marl and carbonates overlies the Kesrouane. Potassium and argon dating found that volcanic rocks, outcropping near faults were up to 25 million years younger than Bhannes Formation sedimentary rocks. Block faulting and basalt flows continued with the Bikfaya Formation, which is accompanied by large and easily recognizable limestone deposits that easily form cliffs. The Salima Formation lies on top of the Bikfaya, consisting of oolitic limestone, clay, marl and sandstone, although its age is currently under debate. Other significant formations from the Jurassic include the Chouf Formation, Abeih Formation, Mdairej Formation, Hammana Formation and the Cenomanian Sannine Formation as well as the Maameltain Formation. Lebanon shifted to an open marine depositional environment, evidenced by marl laden with foraminifera. The offshore environment was timed with subsidence in Arabia. The Chekka Formation spans the Cretaceous into the Paleocene, made up of white chalk and marly limestone, with beds typically 20 to 50 centimeters thick. Chekka units also contain bands of chert and phosphate nodules, along with units rich in organic matter. The early Eocene is marked by the Arak Formation, siliclastic and carbonate deposits left from the continuation of an offshore environment. The Palmyrides region was covered in limestones in the late Eocene. In some cases, basin deposits appear similar to the Chekka Formation, with chert and marl. Dark cherts, with signs of bioturbation are found in northern Lebanon. Miocene rocks lie unconformably atop Eocene units, with almost the entire Oligocene missing. Some geologists suggest that the Oligocene and Lower Miocene are actually preserved in southern Lebanon as turbiditic sandstones. In the Miocene, the region underwent uplift, the seashore retreated and basalt flows blanked some parts of Lebanon and Syria. In particular, Syria experienced extensive basalt flows between 16 and 8 Ma. Some large marine deposits from the Miocene are located to the west of Mount Lebanon, while alluvial conglomerates covered limestones in Bekaa with up 600 meters of material. The Pliocene succession measures 450 meters north of Tripoli and in the Bekaa, with a mix of sediments and basalt. Pliocene marine succession in the low-lying areas of Lebanon left basalt, chalky limestone, marl and clay.