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� � � � � � � � � � � � � � � � � � � <br />WEST <br />A <br />De/ Norte <br />high <br />f--+ <br />I <br />V <br />Monte Vista graben <br />� <br />TENNESSEE GAS <br />(PRQIECTED) <br />Alamosa horst <br />� <br />AMERADA <br />VERTICAL EXAGGERATION 2.6X <br />0 5 MILES <br />0 7.5 KM <br />Interpretive cross section A--A' across the San Luis Basin; location of section <br />indicated in Symbols: TQa and Qal, Alamosa Formation (Plio—Pleistocene) and <br />Quaternary alluvium; Tsfl, lower Santa Fe Group (Mio—pliocene); Tt, ash—flow tuffs <br />of San Juan volcanic field (Oligocene); Tc, Conejos Formation and equivalents <br />Oligocene); Tbb, Blanco Basin Formation (Eocene); pC, granite—gneiss basement <br />Precambrian); TD, total depth. Figure modified from Gries and Brister (1989). <br />MEfERS <br />2500 <br />2000 <br />1500 <br />1000 <br />S00 <br />SEA LEVEL <br />_5pp <br />-1000 <br />-1500 <br />-2000 <br />FEET <br />8000 <br />8000 <br />4000 <br />2000 <br />SEA LEVEI <br />-2000 <br />_4ppp <br />EAST <br />A' <br />Baca graben <br />Sangre de Cristo <br />Range <br />� � <br />RESERVE AMOCO-MAPCO <br />