A study of the subsurface structure of the flank sediments of the Jennings dome has revealed several stages of uplift of the salt plug which have resulted in erosion and subsequent unconformities. One such uplift at the end of Marginulina times is of great importance, as it closed a period of intense faulting which does not extend into the overlying sediments. It is therefore extremely difficult, if not impossible, to predict the structural conditions which will be encountered in the Marginulina oil sand series when drilling. Faulting of fairly recent age is also present, which cuts both the Miocene and Oligocene sections.

The origin of the mineralized Miocene sand section on the east half of the dome is also discussed, together with the effect of these hard cemented sands upon the growth of the salt plug. This further indicates the manner in which the oil migrated to the supercap sands.

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