Abstract
A graphic method, using Schlumberger logs, was devised for analyzing and displaying detailed variations in the development of a thick shale series. The writer assumes that changes in the thickness of minor units within the shale are related to lateral variations in the depth of water in which sedimentation was taking place. On this basis the form of the sea floor at several stages during Roblecito deposition for two sectors of the Mercedes oil field, Venezuela, has been derived. Links with intermittent fault movement and tilting are indicated, and there is evidence of early high spots in the La Pascua in localities where oil and gas now are found.
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