Table 1.
Description of the North American tree-ring-based fire history database used in this study obtained from the International Multiproxy Paleofire Database, World Data Center for Paleoclimatology (www.ncdc.noaa.gov/paleo/impd/paleofire.html)
| Region | Location | Number of sites | Number of fires (scars) | Number of fires (scars) by 1550 CE | Number of fires (scars) by 1700 CE |
|---|---|---|---|---|---|
| SMO | Sierra Madre Occidental, Mexico | 8 | 231 (1,469) | 0 (0) | 2 (2) |
| AZ | Arizona | 20 | 276 (4,785) | 3 (21) | 63 (605) |
| SNM | Southern New Mexico | 37 | 430 (3,791) | 4 (51) | 58 (558) |
| NNM | Northern New Mexico | 41 | 462 (6,013) | 25 (120) | 150 (1,147) |
| SCO | Southern Colorado | 29 | 243 (2,109) | 19 (105) | 82 (512) |
| NCO | Northern Colorado | 14 | 102 (1,155) | 2 (11) | 23 (129) |
| BHI | Black Hills, South Dakota | 29 | 320 (1,980) | 5 (26) | 90 (435) |
| SNE | Sierra Nevada, California | 54 | 1,220 (6,091) | 26 (181) | 188 (1,024) |
| PNW | Blue Mountains, Oregon, Washington Southern British Columbia, Canada | 6 | 229 (5,646) | 5 (25) | 61 (627) |
| Total | 238 | 3,513 (33,039) | 89 (540) | 717 (5,039) | |