The ongoing controversy over the Piermont area highlights some of the more general problems associated with mapping complex terranes and ancient orogens where there is no paleontological or limited other absolute timing criteria available (Hadley, 1942, 1950; Rumble, 1969; Aleinikoff and Moench, 1987; Moench, 1990, 1992, 1996, 1999; Moench and Aleinikoff, 1991; Billings, 1992; Rankin, 1996, 1999; Rankin and Tucker, 1999; Timms, 2004). The clear presentation of basic observations that support interpretations, plus a measure of uncertainty, is vital for field mapping, given its inherently...

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