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This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards (or with the North American Stratigraphic Code). Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. These guidelines are a working document that is continually under revision. It provides a basis for systematically collecting data and compiling maps of active fault and fold structures. Updated versions of the guideline can be obtained from the authors, on paper or on computer disk