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Guidebook to the Rio Grande Rift inRio Grande rift begin near the rift boundary, although the boundary in some locations may be elusive BRIEF GEOLOGICAL BACKGROUND OF THE RIO GRANDE RIFT The Rio Grande rift is a northtrending and northwardnarrowing (propagating) zone of lithospheric extension expressed in the upper crust by a series of northsouth–trendingThe 550kmlong Rio Grande rift is composed of a series of linked sedimentary basins trending northward from southern New Mexico into southern Colorado The focus of this report is the Española Basin, which is one in a series of four structurally linked, northtrending, rightstepping, en echelon basins in the central part of the rift (fig 2) Geographic Focal Areas Location rio grande rift map