Twenty-Three Mile Bar - USTTM001 Emily K. Heyerdahl, Penelope Morgan, James P. Riser II Dating Method: Crossdated Sample Storage Location: USDA Forest Service, Rocky Mountain Research Station Fire Sciences Lab 5775 West Highway 10 Missoula, MT 59808 stored by Emily K. Heyerdahl (eheyerdahl@fs.fed.us, 406-829-6939) Reference: Keeling, E.G., A. Sala, and T.H. DeLuca. 2006. Effects of fire exclusion on forest structure and composition in unlogged ponderosa pine/Douglas-fire forests. Forest Ecology and Management. 237:418-428. Heyerdahl, Emily K.; Morgan, Penelope; Riser, James P., II. 2008. Crossdated fire histories (1650-1900) from ponderosa pine-dominated forests of Idaho and western Montana. Gen. Tech. Rep. RMRS-GTR-214WWW. Fort Collins, CO: US Department of Agriculture, Forest Service, Rocky Mountain Research Station. 83 p. Available from TreeSearch: http://www.treesearch.fs.fed.us/ Abstract: This site was sampled as part of a study of the effects of 20th-century fire exclusion (site TW in Keeling et al. 2006), hence the relatively short record. Tree locations were determined using handheld global position system receivers. Injuries in the FHX file include both eroded scars (i.e., ones for which much or all of the overlapping, curled woundwood rings were destroyed by subsequent fires or rot) and abrupt changes in the width of annual rings that were synchronous with fire scars on other trees at this sites. We assigned ring-boundary scars to the preceeding calendar year at this site. Comments: Samples located on ridge just west of Twentythree Mile Creek, north of Forest Road 221 along the Selway River. Individual Sample Information: (tree ID,number of samples dated,number of scars dated,number of injuries dated,species,live?,UTM-E (NAD27, zone 11),UTM-N (NAD27, zone 11)) TTM01,1,4,0,Pinus ponderosa,live,623316,5104241 TTM02,1,3,0,Pinus ponderosa,live,623417,5104644 TTM03,1,7,0,Pinus ponderosa,live,623163,5103852 TTM04,1,2,0,Pinus ponderosa,snag,623163,5103811 TTM05,1,2,0,Pinus ponderosa,snag,623139,5103772 TTM06,1,5,0,Pinus ponderosa,live,623139,5103772 TTM07,2,6,0,Pinus ponderosa,snag,623061,5103638 TTM08,1,5,0,Pinus ponderosa,snag,623061,5103658 TTM09,1,4,1,Pinus ponderosa,snag,623055,5103597 TTM10,1,3,0,Pinus ponderosa,live,623886,5104589 TTM11,1,5,2,Pinus ponderosa,live,623594,5103855 TTM12,1,4,1,Pinus ponderosa,snag,623610,5103859 CORRECTION TO DATA: On June 1, 2021, a correction was made to data file usttm001.fhx. REASONING: sample TTM04 (column 4) contained '|' (recorder) in year 1999, year after the end of sequence ']' (bark), at 1998. CORRECTION: change year 1999 to '.' (non-recorder). Fire History Graphs: Fire History Graphs illustrate specific years when fires occurred and how many trees were scarred. They are available in both PDF and PNG formats. The graphs consist of 2 parts, both of which show the X axis (time line) at the bottom with the earliest year of information on the left and the latest on the right. The Fire Index Plot is the topmost plot, and shows two variables: sample depth (the number of recording trees in each year) as a blue line along the left Y axis, compared with the percent trees scarred shown as gray bars along the right Y axis. Below, the Fire Chronology Plot consists of horizontal lines representing injuries by year on individual sampled trees. Symbols are overlain that denote the years containing the dendrochronologically-dated fire scars or injuries. The sample ID of each tree is displayed to the right of each line. The Composite Axis below represents the composite information from all individual series. The symbols used to represent the fire scars or injuries, and the filters used to determine the composite information, are shown in the legend. These graphs were created using the Fire History Analysis and Exploration System (FHAES). See https://www.fhaes.org for more information.