Version 2025-12-04: (_v2 files):

The lab data folder contains a .csv and a point shapefile that includes locations of samples analyzed for trace and major elements joined to analytical lab data.  Descriptions of analytical data fields are included in csv file.  Please note, shapefile truncates field names for analytical data. 

Sample analytical method information can be obtained from the USGS publication: "Geochemical data generated by projects funded by the USGS Earth Mapping Resources Initiative (ver. 11.0, January 2025)"; doi:10.5066/P9WHRLXH.
Full citation: U.S. Geological Survey, 2021, Geochemical data generated by projects funded by the USGS Earth Mapping Resources Initiative (ver. 11.0, January 2025): U.S. Geological Survey data release, https://www.sciencebase.gov/catalog/item/601963c6d34edf5c66f0d0e5.

Depth measurements for samples are noted in Depth_FT and Depth_Inch data columns.
Depth_FT is measured in feet from land surface elevation. Values of -999 represent nulls or no data.
Depth_inch is measured in inches from land surface elevation. Values of -999 represent nulls or no data.


Version 2022-10-05: (_v1 files):
The lab data folder contains a .csv and a point shapefile that includes locations of samples analyzed for trace and major elements joined to analytical lab data.  Descriptions of analytical data fields are included in csv file.  Please note, shapefile truncates field names for analytical data. 