Hurwitz, Shaul Peek, Sara King, John Pigati, Jeff Honke, Jeff Damby, David E. Stricker, Craig 20200827 tables (.csv) and images (.pdf, .tiff) Reston, VA U.S. Geological Survey https://doi.org/10.5066/P9LEQ5HC Shaul Hurwitz John C. King Gregory T. Pederson Justin T. Martin David E. Damby Michael Manga Jefferson D. G. Hungerford Sara Peek 20201017 publication Geophysical Research Letters vol. 47, issue 20 n/a American Geophysical Union (AGU) http://dx.doi.org/10.1029/2020GL089871 Old Faithful Geyser in the Upper Geyser Basin of Yellowstone National Park is one of the best studied geysers in the world. Under research permit YELL-SCI-8030, samples from 13 silicified tree remnants were collected adjacent to the Old Faithful Geyser cone in April and November 2019. The silicified wood samples were dated using the radiocarbon (14C) method and were analyzed by scanning electron microscope (SEM) to determine the extent of wood silicification. This study was conducted in order to provide new information on the geyser’s past long-term (decadal to centennial) eruptive activity. Understanding Old Faithful’s past could provide a baseline for understanding future changes in its eruption intervals. Data were collected to assess past activity at Old Faithful Geyser. 2019 ground condition Complete None planned -110.828024 -110.827579 44.460828 44.460301 USGS Thesaurus carbon-14 analysis carbon isotope analysis tree ring analysis geochronology hydrothermal processes USGS Metadata Identifier USGS:5eb9b5ba82ce25b5135d2718 Geographic Names Information System (GNIS) Yellowstone National Park Old Faithful Geyser USGS Thesaurus: Time Periods Holocene none none Shaul Hurwitz ALASKA REGION: VOLCANO SCIENCE CENTER Research Hydrologist Mailing and Physical

350 North Akron Road

Moffett Field CA 94035 US 650-439-2441 shaulh@usgs.gov This research was conducted under Yellowstone Research Permit YELL-SCI-8030. We thank Jefferson Hungerford, William E. Keller, Behnaz Hosseini, and Annie Carlson at the National Park Service for their assistance with sample collection. No formal attribute accuracy tests were conducted No formal logical accuracy tests were conducted Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. No formal positional accuracy tests were conducted No formal positional accuracy tests were conducted Samples were identified and collected in the field. Photos and notes were taken. GPS points were taken using a Eos Arrow submeter GNSS receiver. 2020 Point OldFaithful_Tree_Locations.csv Sample names, locations, and notes the authors sample_id An alphanumeric sample identifier assigned in the field Producer defined. A string beginning with "OFL" and ending with a number, counting up from 100 - i.e., the first sample is "OFL-101". Samples OFL-103 and OFL-103-2 were subsamples from the same location. date The date the sample was collected. Producer defined. 04/15/2019 11/06/2019 dates latitude The latitude at which the sample was collected. Producer defined. 44.460301 44.460828 longitude The longitude at which the sample was collected. Producer defined. -110.828024 -110.827579 easting (WGS84, UTM 12T) The easting (UTM 12T) at which the sample was collected. Producer defined. 513680 513716 northing (WGS84, UTM 12T) The northing (UTM 12T) at which the sample was collected. Producer defined. 4923013 4923072 notes Descriptions of the sample and surroundings. Producer defined. Text describing the sample and its surroundings. Silicified_Wood_Sample_Descriptions.pdf Photos annotated with sample names and precise locations, with text descriptions. the authors Silicified wood from around Old Faithful Geyser, Yellowstone National Park Photos annotated with sample names and precise locations, with text descriptions. Producer defined. Photos annotated with sample names and precise locations, with text descriptions. ScienceBase US Geological Survey Mailing and Physical

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Denver CO 80225 US 1-888-275-8747 sciencebase@usgs.gov Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. This information product is in the public domain. The data have been approved for release and publication by the U.S. Geological Survey (USGS). Although the data have been subjected to rigorous review and are substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, the data are released on the condition that neither the USGS nor the U.S. Government may be held liable for any damages resulting from authorized or unauthorized use. Although the data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and/or contained herein. Users of the data are advised to read all metadata and associated documentation thoroughly to understand appropriate use and data limitations. 20200827 Sara E Peek ALASKA REGION: VOLCANO SCIENCE CENTER Research Hydrologist Mailing and Physical

350 North Akron Road

Moffett Field CA 94035 US 650-329-4509 speek@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998