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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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In this report surface and subsurface maps of an area comprising six townships and four producing oil fields are shown. From a comparison of these and a cross-section it is demonstrated that these producing folds are buried hills, and are contemporaneous with the Nemaha Mountains. Surface geology was largely responsible for the development of this area. The subsurface folds are remarkably congruent with the surface structure.
The conclusion is drawn that the surface folds are due to differential settling of the upper horizons over the Ordovician hills. The principal producing horizon is this unconformable contact between the Ordovician and later sediments. Furthermore, it is concluded that the oil has migrated laterally for some distance from its source in the lower Pennsylvanian to its present position.
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