Digital recovery, modification, and analysis of Tetra Tech seismic horizon mapping, National Petroleum Reserve Alaska (NPRA), northern Alaska by Saltus, R.W., Kulander, C.S., and Potter, C.J. Spreadsheet Appendix See Table 3 in the report chapter for listing of all the spreadsheet names. All the spreadsheets are in Microsoft Excel format (Office 2000) Stratigraphic horizon abbreviations: SRF = topographic surface NNU = Nanushuk FM = Fortress Mountain LCU = Lower Cretaceous Unconformity SAG = Sag River SAD = Sadlerochit ECH = Echooka LIS = Lisburne ICF = Intermediate Composite Features ALA = Alapah END = Endicott BMT = Basement Play abbreviations: DTS = Brookian Topset Structural TOR = Torok Structural SAG = Sag River (obsolete play - not used in assessment) SAD = Ellesmerian Ivishak ECH = Ellemserian Echooka LIS = Ellesmerian Lisburne END = Ellesmerian Endicott