noaa-fire-44988 Stephens fire data from Illilouette Creek basin - IMPD USILL001 Stephens, S.L. Stephens fire data from Illilouette Creek basin - IMPD USILL001 2026-07-09 NCEI-Paleoclimatology ONLINE Files 00acea4c-965d-4eef-9eca-0845e05e6712 10.25921/8vxn-9c28 https://www.ncei.noaa.gov/access/paleo-search/study/44988 Investigator S.L. Stephens earth science paleoclimate fire history|tree ring age,null,null,year Common Era,null,fire history|tree ring,null,null,N,null earth science paleoclimate fire history|tree ring sample identification,null,null,dimensionless,null,fire history|tree ring,null,null,N,null earth science paleoclimate fire history|tree ring tree demographic and injury and fire event code,wood,null,dimensionless,null,fire history|tree ring,null,null,C,text description of fire event; refer to IMPD documentation for description of codes earth science paleoclimate fire history fire scar dates geoscientificInformation 1623 CE 2005 CE 327 cal yr BP -55 cal yr BP Complete 37.675156 37.675156 -119.485662 -119.485662 2239 2239 Continent North America United States Of America California Illilouette Creek basin - IMPD USILL001>LATITUDE 37.675156>LONGITUDE -119.485662 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncei.noaa.gov/products/paleoclimatology Data Center Contact NOAA World Data Service for Paleoclimatology paleo@noaa.gov 828-271-4800 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Collins, B.M. and Stephens, S.L. 2007 Frontiers in Ecology and the Environment 5 10 523-527 10.1890/070007

Past policies of excluding all wildfires from forests throughout the US are giving way to new strategies that incorporate naturally ignited fires into forest and fire management. In this paper, we evaluate the effects of long-standing natural fire programs (now referred to as wildland fire use or WFU) in two Sierra Nevada wilderness areas. We present reconstructions of historical fire occurrence using tree ring proxies, along with chronologies of tree recruitment, to infer the effects of WFU programs on forest structure. Historically, fires burned every 6 to 9 years, which moderated tree recruitment. Fire suppression policies established in the early 1900s successfully excluded fire and allowed for unprecedented tree recruitment. Despite the substantial changes in forest structure and composition, the frequency and extent of fires during the current WFU period (1972–present) approach historical levels. This information can provide some necessary insight in implementing WFU policy and developing management plans for similar forest types throughout the western US. STUDY NOTES: This dataset was contributed as part of the North American Tree-ring Fire Scar Synthesis (NAFSS) project (https://www.ncei.noaa.gov/access/paleo-search/study/34853). Data were contributed to the project from the original data generators. Sample Storage Location: Dating Method: Dated Related ITRDB_Chronology: Not Applicable Fire scar data from this site are available in FHX2 format at: https://www.ncei.noaa.gov/pub/data/paleo/firehistory/firescar/northamerica/usill001.fhx along with associated metadata at: https://www.ncei.noaa.gov/pub/data/paleo/firehistory/firescar/northamerica/usill001-fhx-noaa.txt

GET DATA https://www.ncei.noaa.gov/pub/data/paleo/firehistory/firescar/northamerica/usill001.fhx GET DATA https://www.ncei.noaa.gov/pub/data/paleo/firehistory/firescar/northamerica/usill001-fhx-noaa.txt USA/NOAA DIF Version 9.8.4 2026-08-05 2026-08-05