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131 The Tertiary exposures lie in the broad basin of the upper part of a ca�ad�n which empties into the Rio Chico immediately above Paso Niemann, on the right (SE) bank of the river, nearly opposite the mouth of Ca�ad�n Vaca. This ca�ad�n is (crossed out: locally called Ca�ad�n Tres Botellas, but is) known to the Y.P.F. geologists as Ca�ad�n Hondo.