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Cuba is regarded as an important though untested oil reserve. A large portion is underlain by a column of conformable unmetamorphosed Jurassic, Cretaceous, and Tertiary sediments. These include limestones with lesser portions of shale, sandstone, and conglomerate. The surface formations apparently reflect the structure of those which lie at greater depths. Adequate source material, reservoir beds, and structure for the formation and accumulation of petroleum are present. In several instances large oil accumulations have been dissipated by surface evaporation through post-Tertiary fissures. It appears that several of the large unfissured and untested anticlines may contain equally important intact and exploitable accumulations.
Though serpentine occurs in large areas, most of it is of late Tertiary intrusion, occurring, almost entirely, as dikes and surface flows and not as masses below folds or a material component of the pre-Jurassic basement. Its only relation to petroleum occurrences is that in certain cases both serpentine and oil have escaped from their respective reservoirs to the surface through the same late Tertiary fissures.
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