Lebanon was the site of marine, predominantly calcareous, sedimentation throughout much of Jurassic, Cretaceous, and early Tertiary time. The principal structures of the region are vertical faults and flexures, which though produced by Alpine orogenic movements in the late Tertiary, are believed to reflect basement block faulting commencing at the end of the Jurassic, or even earlier. The various known indications of hydrocarbon accumulations (asphalt deposits and impregnations, oil seeps, gas showings) appear to have no genetic relation to the beds in which they occur and are assumed to have their source in pre-Jurassic rocks at depth. Many permeable zones and both anticlinal and potential stratigraphic traps are present in the Mesozoic section.

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