. Transactions. in South America has, with one exception,1 been undertakenupon lands which possessed direct evidence of oil in seepages or asphalticdeposits, occurring either immediately upon the lands or in their closevicinity. The development of oil fields in South America is thereforein the pioneer stage. It is not at all improbable that hidden fieldswill be uncovered in future work, as has occurred notably in the mid-continental field of this country within recent years. Location The areas grouped as a unit under the title of North Argentine-Bolivian oil field extend in a narrow belt from
. Transactions. in South America has, with one exception,1 been undertakenupon lands which possessed direct evidence of oil in seepages or asphalticdeposits, occurring either immediately upon the lands or in their closevicinity. The development of oil fields in South America is thereforein the pioneer stage. It is not at all improbable that hidden fieldswill be uncovered in future work, as has occurred notably in the mid-continental field of this country within recent years. Location The areas grouped as a unit under the title of North Argentine-Bolivian oil field extend in a narrow belt from the north-central part of * Consulting Oil Geologist. 1 The accidental discovery of oil in boring for water at Comodoro Rivadavia,Argentina. STANLEY C. HEROLD 545 the Province of Salta, Argentina, northward into the central part ofBolivia. This belt lies in a direction a few degrees east of north, slightlycurved with its concave flexure to the west, passing through the border Longitude II•est from Greenx-icti. [Based on the investigation-; of SO3 ,[ Frederick 8, O. fferotd and ijlf *VS Sou tb Georgia Map Outline- bv Courtesv of MntWw s->orthmp W otls, Fig. 1. town of Yacuiva at latitude 22° South and longitude 63° 30 West ofGreenwich. It extends from 18° South to 23° South latitude. To the west of the field lie the frontal ranges of the Andes System,beyond which extend high rugged mountains, deep narrow gorges and vol. lxi.—535. 546 OIL IN THE NORTH ARGENTINE-BOLIVIAN FIELD high plateaus, culminating in the crest of the continental range. Towardthe east extends the great expansive plain, reaching over northeast Argen-tine, southeast Bolivia, northern Paraguay, and into southern seepages of oil occur in the following political subdivisionsof the two countries: Argentina: Department of Oran, Province of : Department of Tarija. Department of Sucre (Chuquisaca). Department of Santa Cruz. The location of this field has giv
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