**6. Discussion**

This paper illustrates a method to identify distinct regional tectonic events and put them in relative chronological order from fault slip data collected on a few local roadcuts. The data was collected in this case over a period of 10 days. The volume of fault orientation and slip data is relatively small compared to regional field mapping of large scale structures field studies, but by explicitly considering the stress tensors that could have produced the observations, the fault data can be sorted and grouped into Regimes that yield compatible stress tensors that can be further grouped into distinct tectonic Events. In the southwest White Mountain region, the Events identified correspond to known tectonic events based on large scale structures over the last ~400 Ma. The orientation and relative magnitudes of principal stresses producing major regional tectonic deformations can be obtained relatively quickly from a study at one locality.

The conditions for this study were close to ideal because the roadcuts exposed unaltered rocks recently exhumed by the last glaciation. The direct inversion method could potentially be applied using oriented cores from boreholes where there are no outcrops. This paper illustrates how, if the stress tensor can be constrained, the history of overprinted deformation that could have impacted basin resources can be deduced from features on the surfaces of fractures reactivated by sequential tectonic events.

**Author Contributions:** C.C.B.: field collection of data 50%, writing of manuscript 90%. J.A.: field collection of data 50%, inversion of data and identification of regimes and events 95%, writing of manuscript 10%. All authors have read and agreed to the published version of the manuscript.

**Funding:** C.C. Barton was supported by the U.S. Geological Survey as part of his employment. J. Angelier was supported by the Universite Pierre et Marie Curie as part of his employment.

**Acknowledgments:** The authors wish to acknowledge support from the U.S. Geological Survey. J. Angelier was an early key developer of the Direct Inversion Method of Fault-Slip Analysis for unraveling tectonic history to deduce paleo stress orientations and relative magnitudes from surface structures on the faces rock fractures reactivated by sequential tectonic activity. Readers are directed to his many papers on this subject. He was a pleasure to work with in the field. His field notebooks were magnificent and artistically beautiful. His intelligence, enthusiasm, and good company is missed by those who knew and worked with him. Jacques Angelier died in January 2010. The authors thank Tristan Co ffey who drafted the figures and tables. The authors thank C. Page Chamberlain and Gautum Mitra who provided early reviews of this manuscript and two anonymous additional reviewers. The authors also thank Lawrence Cathles who provided a thorough edit for this volume.

**Conflicts of Interest:** The authors declare no conflict of interest.

**Data Availability:** The data collected for each fault listed in tabular form in Appendix A is also available at: http://www.hubbardbrook.org/data/dataset\_search.php.

### **Appendix A. List of Data Collected in This Study**


**Table A1.** Fault Data Collected and Analyzed in This Study.


**Table A1.** *Cont*.


**Table A1.** *Cont*.


**Table A1.** *Cont*.



**Table A1.** *Cont*.
