Abstract
A new map has been constructed to summarize major, systematic variations in seismic reflection character observed by over 10000 km of COCORP profiling in the US. Among the seismic characteristics represented on this map are: crustal scale detachments, which can be traced as relatively low-angle reflectors over large areas; deeply penetrating, dipping reflection zones, some of which mark major shear zones, perhaps even crustal sutures; Moho reflectivity, which appears to vary from craton to Phanerozoic periphery; seismic transparency which can sometimes be interpreted as geologic «homogeneity»; seismic layering, prominent in the lower crust in many areas and now known to dominate the upper basement in other regions; and unusually strong reflections, or bright spots, at mid-crustal levels that may mark deep crustal fluids
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