. Transactions. that seeping at the surface in other parts of the field. Geological ConditionsStratigraphy The surface of the oil region is entirely covered by only signs of igneous rocks are a few scattering fragments to be foundin the creek beds, which have evidently been transported from the highermountains of the Andes Range to the west. Such transportation tookplace previous to the late diastrophism which gave rise to topographicfeatures now eroded to their present condition in this Sub-Andeanprovince. STANLEY C. HEROLD 557 The stratigraphy of this area has been a subjec
. Transactions. that seeping at the surface in other parts of the field. Geological ConditionsStratigraphy The surface of the oil region is entirely covered by only signs of igneous rocks are a few scattering fragments to be foundin the creek beds, which have evidently been transported from the highermountains of the Andes Range to the west. Such transportation tookplace previous to the late diastrophism which gave rise to topographicfeatures now eroded to their present condition in this Sub-Andeanprovince. STANLEY C. HEROLD 557 The stratigraphy of this area has been a subject of discussion for someyears past by the geologists who have worked here or in close remains have been found in but one horizon sufficient to classifyits age. Other strata covering the greater part of the area are apparentlynon-fossiliferous, for diligent search has failed to produce , classification has largely been based upon correlation ofstrata and comparative lithology. Fig. 4.—A view of the Sierra de Aguarague, in Bolivia. The Sub-AndeanTertiary series is shown along the crest. The recent work of Dr. Bonarelli has established the correctness ofthe stratigraphic interpretation previously given by Steinmann andBodenbender, though Bonarelli has proceeded farther in differentiation bysubdividing the groups formerly recognized. Bonarellis divisions of the Aguarague formations are as follows: (J) Recent alluvial. (e) Quaternary. (d) Sub-Andean Tertiary. (c) Upper sandstone (Areniscas superiores). (6) Calcite-dolomite horizon. (a) Petroliferous formation, or lower sandstone. The Petroliferous Formation The term Formation PetroHfera was first ueed by Brackebusch inhis early studies of the northern Argentine provinces. He later desig-nated the series Salta Series (Sistema de Salta) obviously with the 558 OIL IN THE NORTH ARGENTINE-BOLIVIAN FIELD same stratigraphic limits as signified by the first name. This seriesis divided by Bonarelli int
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