Abstract
Bouguer gravity is always referred to an arbitrary reference surface or elevation which is usually the mean sea level (MSL). When a surveyed area is flat or has gentle topographic relief (as in the Venezuelan Llanos or the Ucayali and Maranon Basins in the Amazon jungles), the MSL is an excellent reference. However, when the topographic relief changes drastically within the surveyed area (e.g., the Barinas and Pie de Monte Llanero in the foothills of the northern Andes in the Santiago Basin, the foothills of the Andes in Peru and Bolivia, or through the Patagonia in Argentina), important structures detectable by gravity that are above the MSL are difficult to interpret.
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