[Descripción]  Surficial geology of Africa. La leyenda es exclusivamente de periodos geológicos, no contiene información sobre la naturaleza de las rocas o formaciones.
[Autoría] U.S. Geological Survey, Central Energy Resources Team
[Web original] World Geologic Maps, http://energy.usgs.gov/OilGas/AssessmentsData/WorldPetroleumAssessment/WorldGeologicMaps.aspx  
[Formato] Vectorial; original: shapefile; local: geopackage.
[Resolución espacial / Escala] 1000 m (original geological maps are of 500 m maximum accuracy (0.1 mm on paper map of 1:5,000,000 scale). Scanned images were of 200 dot/inch resolution (0.12 mm on paper). That is why fuzzy tolerance for "clean" program in ARC/INFO was set to 500 m. Average positional accuracy can be evaluated as 1000 m (twice of fuzzy tolerance).
[SRS] EPSG:4326
[Licencia] No se especifica, la descarga es libre y sin registro previo.
[Descarga en origen] http://certmapper.cr.usgs.gov/data/we/ofr97470a/spatial/shape/geo7_2ag.zip  
[Descarga en local] v0306_geol_1km
[Observaciones] Cita: Feliks Persits, Thomas Ahlbrandt, Michele Tuttle, Ronald Charpentier, Michael Brownfield, Kenneth Takahashi (2002) Map showing geology, oil and gas fields and geologic provinces of Africa. Open File Report 97-470A, version 2.0. U.S. Geological Survey.

[Extensión geográfica]