Anthony F. Pivarunas Duane E. Champion Margaret S. Avery 20251126 spreadsheet ScienceBase U.S. Geological Survey Measurement-level data are deposited in the MagIC community paleomagnetic database. https://doi.org/10.5066/P1RHWJBN https://doi.org/10.7288/V4/MAGIC/20334 https://earthref.org/MagIC/20334 This dataset consists of 424 paleomagnetic sites from Newberry Volcano. 15 sites were analyzed at the natural remanent magnetization level, 256 sites were analyzed with blanket demagnetization, and 153 sites were analyzed with modern stepwise demagnetization protocols. 412 sites yield acceptable paleomagnetic data. These data were collected to assess the behavior of the geomagnetic field and assist in geologic mapping and correlation of volcanic units at Newberry Volcano. An appropriate use of the data would be to correlate volcanic units, identify periods of volcanic activity, or study the geomagnetic field. The measurement level data for this dataset are in the MagIC database at https://earthref.org/MagIC/20334. 19770101 20181231 observed In work As needed -121.3640 -120.8600 43.9140 43.5130 ISO 19115 Topic Category geoscientificInformation None paleomagnetism volcanism Oregon USGS Metadata Identifier USGS:67cb42add34ecfe34cc7d89f None Oregon Newberry Volcano None. Please see 'Distribution Info' for details. None. Users are advised to read the dataset's metadata thoroughly to understand appropriate use and data limitations. Anthony F Pivarunas USGS - ALASKA REGION Research Geophysicist mailing and physical

NASA AMES-Moffett Field,Moffett Field - Building 19

Moffett Field CA 94035 650-439-2053 apivarunas@usgs.gov Julie Donnelly-Nolan, Robert Jensen, Mark Stelten, Marvin Lanphere, U.S. Forest Service, Volcano Science Center This dataset was produced on computers running DOS, Windows, and Macintosh operating systems over the decades-long production of these paleomagnetic data. Calculations on these data were performed with (laboratory-developed) Fortran and (open-source) Python software packages. The file format of the dataset is text (CSV or tab-delimited) files. There are 3 files in this data release: 'Newberry_sites_all.csv', 'Newberry_units_all.csv', 'Newberry_units_modern.csv'. Julie M. Donnelly-Nolan Robert A. Jensen Duane E. Champion Mark E. Stelten Joel E. Robinson 2026 publication Laboratory standards were run to assess magnetometer accuracy over the data acquisition period. Data were examined for general consistency. Issues of data duplication and accuracy of sites and units were checked. Upload of electronic files for this dataset conform to MagIC Data Model 3.0 as validated during their upload process. No formal logical tests were conducted. Data set is considered complete for the information presented. No formal positional accuracy tests were conducted. No formal positional accuracy tests were conducted. Paleomagnetic samples were collected and processed using standard paleomagnetic protocols (Butler, 1992). Sites consisted of multiple cores up to 12 cm long drilled with a gasoline-powered, water-cooled, diamond-bit coring drill from a single cooling unit. Sites were oriented in the field using a U.S. Geological Survey or Pomeroy orienting fixture with a magnetic compass. An astrocompass or sun compass was used for orienting when possible to correct magnetic declination. Unknown Samples were trimmed to standard size specimens. Unknown The natural remanent magnetization of specimens was measured with a magnetometer. Pilot specimens were demagnetized at most sites. Other specimens were then subjected to demagnetization at the appropriate interval as determined from pilot specimen measurements. Beginning in the late 2000s, all specimens were subjected to stepwise demagnetization. Unknown Specimen data were used to calculate mean directions at the site level using Fisher (1953) statistics. The directions used to calculate the mean are either the natural remanent magnetization directions, the blanket demagnetized directions, or the lines/planes assessed from stepwise demagnetized data (Kirschvink, 1980). Unknown .001 .001 Decimal degrees World Geodetic System 1984 (WGS 84) WGS_1984 6378137.0 298.257223563 Newberry_units_all.csv, Newberry_units_modern.csv Comma Separated Value (CSV) file containing data. Producer Defined unit Code for volcanic unit on map of Newberry Volcano Producer Defined NoData Volcanic unit is not on the map of Newberry Volcano. Producer defined Alphanumeric code. lat latitude of the paleomagnetic site (coordinate system WGS 1984) Producer Defined 43.40567 44.27976 lon longitude of the paleomagnetic site (coordinate system WGS 1984) Producer Defined 238 240 dec paleomagnetic declination of mean direction from site Producer Defined 0.0 360.0 inc paleomagnetic inclination of mean direction from site Producer Defined -63.4 82.0 a95 the radius of the interval of 95% confidence about the mean site direction (Fisher, 1953) Producer Defined 0.9 36.6 k the paleomagnetic precision parameter (Fisher, 1953) Producer Defined << empty cell >> No Data Producer defined 21 33583 N number of sites used to calculate the mean direction for the volcanic unit Producer Defined 1 42 n number of samples used to calculate mean direction of the volcanic unit Producer Defined 2 326 ntotal number of samples analyzed from unit in total Producer Defined 6 345 order Stratigraphic order of volcanic units on the map of Newberry Volcano. Numbers above 200 are categorical and refer to general order for units that are not on the map. Producer Defined 2 300 age age of unit, unit of kilo annum Producer Defined 7.0 670.0 age_1_sigma 1 sigma uncertainty on age determination Producer Defined 0.12 765 kilo annum age_type MagIC Data Model 3 method codes for nature of age determination Producer Defined GM-ARAR radiometric age from argon geochronology Producer defined GM-CC-STRAT inferred age from stratigraphic constraints Producer defined GM-C14 radiometric age from radiocarbon geochronology Producer defined vgp_lat Latitude of virtual geomagnetic pole which would produce the paleomagnetic direction observed at the site Producer Defined -90 90 degrees vgp_lon Latitude of virtual geomagnetic pole which would produce the paleomagnetic direction observed at the site Producer Defined 0 360 degrees Newberry_sites_all.csv Comma Separated Value (CSV) file containing data. Producer Defined site Unique code for paleomagnetic site acquired in the field. Producer Defined Alphanumeric codes unit Code for volcanic unit on map of Newberry Volcano Producer Defined strings description Full name of volcanic unit from code description in the 'unit' column Producer Defined strings order Stratigraphic order of volcanic units on the map of Newberry Volcano. Numbers above 200 are categorical and refer to general order for units that are not on the map. Producer Defined 2 1000 lat latitude of the paleomagnetic site (coordinate system WGS 1984) Producer Defined << empty cell >> No Data Producer defined 43.376 44.544 lon longitude of the paleomagnetic site (coordinate system WGS 1984) Producer Defined << empty cell >> No Data Producer defined 238 240 dec paleomagnetic declination of mean direction from site Producer Defined << empty cell >> No Data Producer defined 0.0 359.9 inc paleomagnetic inclination of mean direction from site Producer Defined << empty cell >> No Data Producer defined -66.5 83.6 a95 the radius of the interval of 95% confidence about the mean site direction (Fisher, 1953) Producer Defined << empty cell >> No Data Producer defined 0.7 18.7 k the paleomagnetic precision parameter (Fisher, 1953) Producer Defined << empty cell >> No Data Producer defined 16 33583 n number of samples used to calculate mean site direction Producer Defined << empty cell >> No Data Producer defined 2 24 ntotal number of samples analyzed from site Producer Defined << empty cell >> No Data Producer defined 2 25 result_quality description of analytical result from site Producer Defined b unsuccessful experiment, data not considered further. Producer defined g good experiment, data used in further analysis Producer defined g:o good experiment, however, data discarded due to non-proximity to Newberry Volcano or poor age constraints Producer defined method_codes MagIC Data Model 3 method codes for demagnetization and mean calculation Producer Defined << empty cell >> No Data Producer defined DE-NRM mean direction calculated from natural remanent magnetization Producer defined DE-BLANKET:LT-AF-D mean direction calculated from a single blanket step of demagnetization Producer defined LT-AF-D:DE-BFL alternating field demagnetization, mean direction calculated from stepwise demagnetization data of lines only Producer defined LT-AF-D:DE-FM-LP alternating field demagnetization, mean direction calculated from stepwise demagnetization data of lines and planes Producer defined LT-AF-D alternating field demagnetization Producer defined LT-HT-Z thermal demagnetization Producer defined LT-AF-D:DE-BFP alternating field demagnetization, mean direction calculated from stepwise demagnetization data of planes only Producer defined lithologies geologic rock type Producer Defined << empty cell >> No Data Producer defined Basalt Basalt rock Producer defined Basaltic Andesite Basaltic andesite rock Producer defined Lava Flow A volcanic lava flow Producer defined Andesite Andesite rock Producer defined Tuff Volcanic tuff Producer defined Andesitic Tuff Volcanic tuff with andesitic composition Producer defined Rhyolite Rhyolite rock Producer defined age age of unit, unit of kilo annum Producer Defined 5.0 8830.0 age_1_sigma 1 sigma uncertainty on age determination Producer Defined 0.12 765 kilo annum age_type MagIC Data Model 3 method codes for nature of age determination Producer Defined << empty cell >> No Data Producer defined GM-CC-STRAT age inferred from stratigraphic constraints Producer defined GM-C14 radiometric age from radiocarbon methods Producer defined GM-ARAR radiometric age from argon geochronology methods Producer defined There are two detailed tabs which describe the overall table: ('Newberry_sites_all.csv') and the two data files filtered from that one: ('Newberry_units_all.csv', 'Newberry_units_modern.csv'). Description of the data files: 'Newberry_sites_all.csv' : This table has the record of all 424 sites sampled around Newberry Volcano. Paleomagnetic data from successful analyses are presented. There are 18 columns. 'Newberry_units_all.csv': This table has the summary paleomagnetic data from all map units. If there were multiple sites in a given mapped volcanic unit, only the mean direction is on this table. If there was only one site in the map unit, then that site is presented. There are 16 columns. 'Newberry_units_modern.csv': This table has the summary paleomagnetic data from map units that were stepwise demagnetized in accordance with modern methods. All data from this table is contained in ‘Newberry_units_all.csv’; however, this table is most suitable for re-use in modern data compilations. There are 16 columns. Present data release. U.S. Geological Survey - ScienceBase mailing address

Denver Federal Center

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Denver CO 80225 1-888-275-8747 sciencebase@usgs.gov Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. Digital Data https://www.sciencebase.gov/catalog/item/67cb42add34ecfe34cc7d89f https://doi.org/10.5066/P1RHWJBN https://earthref.org/MagIC/20334 https://doi.org/10.7288/V4/MAGIC/20334 None 20251126 Anthony F Pivarunas USGS - ALASKA REGION Research Geophysicist mailing and physical

NASA AMES-Moffett Field,Moffett Field - Building 19

Moffett Field CA 94035 1-650-439-2053 apivarunas@usgs.gov FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998