. Transactions. since thattime. This is, no doubt, the cause of frequent earthquakes in theregion today. A sketch map by Dr. Bonarelli, showing the structural features of theArgentine portion of the Sierra de Aguarague and adjoining territoryto the east and west, is reproduced in Fig. 5. The strong thrusts have upturned the petroliferous formation alongthe Aguarague Range so that they are now standing at 75° or higher,dipping east or west, with a strike of N. 10° E. Stresses have been greatlyrelieved by a series of thrust faults between the ranges to the west andalong the eastern flank of the
. Transactions. since thattime. This is, no doubt, the cause of frequent earthquakes in theregion today. A sketch map by Dr. Bonarelli, showing the structural features of theArgentine portion of the Sierra de Aguarague and adjoining territoryto the east and west, is reproduced in Fig. 5. The strong thrusts have upturned the petroliferous formation alongthe Aguarague Range so that they are now standing at 75° or higher,dipping east or west, with a strike of N. 10° E. Stresses have been greatlyrelieved by a series of thrust faults between the ranges to the west andalong the eastern flank of the Aguarague. The frontal range does notmark, however, the eastern limit of the action of the thrusts, for there is STANLEY C. HEROLD 561 evidence of steeply dipping strata underlying the Quaternary deposits ofthe Chaco plains, at least within a certain radius of the range. The Sierra de Aguarague fault extends along the eastern flank of therange for almost its entire length. It plays the important role of aiding. AnticlineslyxV I Synclines Fig. 5.—Dr. Bonarellis sketch showing structure in the Argentine sectionof the North Argentine-Bolivian field. the petroleum to the surface at the numerous springs. In Argentine, thefault plane has a strike of approximately N. 20° E. and swings to due northin Bolivia. The dip is to the west, varying between 40° and 60°. Athrust displacement of over 1500 ft. (457 m.) has taken place. VOL. LXI.—36. 562 OIL IN THE NORTH ARGENTINE-BOLIVIAN FIELD The calcite-dolomite horizon accompanied the underlying formationin its distortions, as it had previously been deposited conformably uponthem. The upper sandstone series presents a different aspect from the lowerstrata. With a strike varying between N. 10° E. and N. 26° E., it has awesterly dip ranging from 3° to 30° in the south and north formation is oil-bearing on Galarza Creek at the Tobar has taken place from the older strata below. The Sub-Andean Tertiary
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