Name: Christiansen samples

Display Field: SampleID

Type: Feature Layer

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Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This database was prepared using a combination of materials that include aerial photographs, topographic maps (1:24,000 and 1:250,000), field notes, and a sample catalog. Our goal was to translate sample collection site locations at Yellowstone National Park and surrounding areas into a GIS database. This was achieved by transferring site locations from aerial photographs and topographic maps into layers in ArcMap. Each field site is located based on field notes describing where a sample was collected. Locations were marked on the photograph or topographic map by a pinhole or dot, respectively, with the corresponding station or site numbers. Station and site numbers were then referenced in the notes to determine the appropriate prefix for the station. Each point on the aerial photograph or topographic map was relocated on the screen in ArcMap, on a digital topographic map, or an aerial photograph. Several samples are present in the field notes and in the catalog but do not correspond to an aerial photograph or could not be found on the topographic maps. These samples are marked with “No” under the LocationFound field and do not have a corresponding point in the SampleSites feature class. Each point represents a field station or collection site with information that was entered into an attributes table (explained in detail in the entity and attribute metadata sections). Tabular information on hand samples, thin sections, and mineral separates were entered by hand. The Samples table includes everything transferred from the paper records and relates to the other tables using the SampleID and to the SampleSites feature class using the SampleSite field.</SPAN></P><P><SPAN>Data were minimally modified by the Wyoming State Geological Survey (WSGS) in March, 2022 for simplified display on the interactive Geology of Yellowstone Map. The SampleSites feature class was joined to the Samples nonspatial table by the SampleSite field. Records where LocationFound = "No" were deleted because these records lack spatial data. The SampleSites feature class was then joined to the HandSamples, ThinSections, and MineralSeparates nonspatial tables by the SampleID field. Records from these three nonspatial tables that are populated (in other words, where the data exist), were assigned a "Yes" value in the "Hand sample?", "Thin section?", and "Mineral separates?" fields respectively; all other records were assigned "No" values in these fields. The joined table was exported to the final feature class, and some fields were added, given different aliases, or had their visibility turned off for simplified display on the interactive Geology of Yellowstone Map. The WSGS has not formally reviewed or quality-controlled these data; users are encouraged to consult the original data source.</SPAN></P></DIV></DIV></DIV>

Service Item Id: 3ce021cb9a2949b79a459460f8ba1615

Copyright Text: Rock samples collected and analyzed by Robert L. Christiansen, Edward W. Hildreth, Richard M. Blank, and Harold J. Prostka during 1965-2001. Robinson, J.E., McConville, E.G., Szymanski, M.E., and Christiansen, R.L., 2021, Yellowstone Sample Collection - database: U.S. Geological Survey data release, https://doi.org/10.5066/P94JTACV.

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Type ID Field: null

Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID )
• SampleID ( type: esriFieldTypeString, alias: Sample number, length: 50 )
• SampleSite ( type: esriFieldTypeString, alias: Sample site, length: 50 )
• Year_ ( type: esriFieldTypeString, alias: Year, length: 50 )
• SampleSource ( type: esriFieldTypeString, alias: Geologist, length: 50 )
• Unit ( type: esriFieldTypeString, alias: Unit, length: 100 )
• Label ( type: esriFieldTypeString, alias: Label, length: 50 )
• Notes ( type: esriFieldTypeString, alias: Notes, length: 400 )
• Hand_sample ( type: esriFieldTypeString, alias: Hand sample?, length: 3 )
• Thin_section ( type: esriFieldTypeString, alias: Thin section?, length: 3 )
• Min_sep ( type: esriFieldTypeString, alias: Mineral separates?, length: 3 )
• Data_source ( type: esriFieldTypeString, alias: Data source, length: 200 )

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