Skyler P. Mavor Ryan S. Crow George Billingsley 20250721 tabular digital data https://doi.org/10.5066/P1OXUWOP This is a data release of a .csv file that provides measurements of structural features in the Grand Canyon region. These data document structural attitudes, used to describe the orientations of geologic features in three dimensions. Included fields describe the type of geologic feature mentioned, the azimuth and inclination of the measurement (for planar data these correspond to the strike and dip of the feature in right-hand-rule azimuth convention), and the geologic unit from which the measurement was collected. Confidence fields describe the geologist's confidence that the feature was correctly identified, and the measurement precision expressed in degrees of uncertainty. Location information are given in latitude and longitude, as well as a confidence field to convey the location uncertainty. Measurements are attributed individually to the source of the orientation information and the positional information. This release includes data compiled for a publication in preparation and includes measurements of jointing near the Grand Canyon south rim. These data document the fracture patterns that may influence groundwater flow in the area. Structural measurements were collected during geologic mapping and scientific investigations in the Grand Canyon region. These data, of geologic orientation information, can be used to better characterize the geologic structure and tectonic history of the region, as well as influence of the geology to groundwater flow. 2025 publication date Complete As needed Grand Canyon region. -112.2989 -112.0991 36.1131 36.0004 ISO 19115 Topic Category geoscientificInformation USGS Thesaurus fracture (geologic) structural geology deformation (geologic) None GMEG (Geology, Minerals, Energy, and Geophysics Science Center) NCGMP (National Cooperative Geologic Mapping Program) LOCOS (Geologic Mapping of the Lower Colorado River System) USGS Metadata Identifier USGS:68406a41d4be022b9cea5ca6 Common geographic areas Grand Canyon National Park Arizona Kaibab National Forest No access constraints. Please see 'Distribution Information' for details. Any derivative products utilizing these datasets shall clearly indicate their source. If data are modified in any way the user is obligated to describe the types of modifications that have been made. User specifically agrees not to misrepresent these datasets, nor to imply that changes that were made were approved by the USGS. Even though the dataset includes information about positional accuracy, it is NOT a survey document and should not be utilized as such. Users are advised to read the dataset's metadata thoroughly to understand appropriate use and data limitations. Skyler P Mavor USGS - SOUTHWEST REGION Research Geologist mailing and physical

Flagstaff Science Campus, Building 3

Flagstaff AZ 86001 928-556-7198 smavor@usgs.gov Funding for data collection was provided by the U.S. Geological Survey National Cooperative Geologic Mapping Program to the USGS Geology, Minerals, Energy, and Geophysics Science Center (GMEG). Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Environment of data creation: Windows 11 Enterprise, Version 23H2, 64-bit operating system, x64-based processor; ArcGIS Pro 3.4.3 Environment of metadata creation: Windows 11 Enterprise, Version 23H2, 64-bit operating system, x64-based processor; Metadata Wizard v2.1.0 The data have been formatted partly following the GeMS (Geologic Map Schema) guidelines for an OrientationPoints feature class of a geologic map database. The attribute field IdentityConfidence conveys the geologist's confidence that the feature that was measured is correctly identified as described in the Type field. The attribute field OrientationConfidenceDegrees conveys the geologist's confidence in the measuring equipment, expressed in a value of degrees. These values may be null (populated with -9999) if not provided. Azimuth and Inclination values were checked for logical consistency with the type of measurement provided. For instance, measurements with a Type value of Vertical joint were checked to ensure that the Inclination value is equal to 90. The MapUnit field was visually checked to ensure that the value is consistent with geologic mapping. The data include joint measurements within 10 kilometers of studied springs. Other measurement types collected by geologists, as well as measurements outside of this area, are not included. The attribute LocationConfidenceMeters conveys positional accuracy for data collected by known methods. These data were located using mobile tablet devices and populated with a positional accuracy determined by the device GPS unit. A value of -9999 in this field denotes data for which the method of locating the measurement is unknown and thus the positional accuracy cannot be determined. A formal accuracy assessment of the vertical positional information in the data set has either not been conducted or is not applicable. U.S. Geological Survey 2020 publication Techniques and Methods 11-B10 https://doi.org/10.3133/tm11B10 Digital and/or Hardcopy 2020 publication date GeMS Digital geologic map publication standards. Structural measurements were collected by geologists as part of an in-progress geologic mapping effort. Measurements were largely collected in the field using standard structural geology methods including measurements with a Brunton compass or by digital device. Some measurements, mostly those attributed in the DataSourceID field to G. Billingsley, were collected presumably using a combination of aerial imagery and field observations, though the details pertaining to specific measurements are no longer available. Measurements were logged digitally into a geologic mapping database using the GeMS schema. The data for v1.0 of this data release were filtered spatially and by attribute to include measurements of joint attitudes within 10 kilometers of selected springs near the Grand Canyon south rim. The filtered data were exported from ArcGIS Pro and edited in Microsoft Excel to remove unneeded fields of the GeMS schema in preparation for this data release. GeMS 2025 Skyler P Mavor USGS - SOUTHWEST REGION Research Geologist mailing and physical

Flagstaff Science Campus, Building 3

Flagstaff AZ 86001 928-556-7198 smavor@usgs.gov Vector Entity point 40 Universal Transverse Mercator 12 0.9996 -111.0 0.0 500000.0 0.0 coordinate pair 0.6096 0.6096 meters North_American_Datum_1983 GRS 1980 6378137.0 298.257222101 Structural measurements in the Grand Canyon region.csv Comma Separated Value (CSV) file containing point structural attitude information. Producer Defined Type Specifies type of geologic feature represented by this database row. GeMS Vertical joint Planar fractures that accommodated extension perpendicular to the plane and no shear displacement, oriented such that the plane is parallel to a vertical line. Producer defined Inclined joint Planar fractures that accommodated extension perpendicular to the plane and no shear displacement, oriented such that the plane is neither vertical nor horizontal. Producer defined Azimuth Strike of planar feature or trend of linear feature, as measured in degrees clockwise from geographic North. GeMS 0 347 Degrees Inclination Dip of planar feature or plunge of linear feature, as measured in degrees down from horizontal. GeMS 74 90 Degrees LocationConfidenceMeters Radius (in meters) of positional-uncertainty envelope around this point feature. GeMs -9999 No Data Producer defined 4 29 Meters IdentityConfidence Indicates how confidently this point feature has been identified as a particular type. GeMS certain Identity of a feature can be determined using relevant observations and scientific judgment; therefore, one can be reasonably confident in the credibility of this interpretation GeMS OrientationConfidenceDegrees Estimated circular error (in degrees) of this orientation. For planar features, error is in orientation of pole to plane. GeMS -9999 No Data Producer defined 5 10 degrees MapUnit Records map unit to which this observation pertains. GeMS Pkh Harrisburg member of the Kaibab Formation (Lower Permian) Producer defined Pc Coconino Sandstone (Lower Permian) Producer defined IPMs Wescogame (Upper Pennsylvanian), Manakacha (Middle Pennsylvanian), and Watahomigi Formations (Lower Pennsylvanian and Upper Mississippian), undivided Producer defined Cm Muav Formation and Frenchman Mountain Dolostone (Middle Cambrian) Producer defined Ct Tapeats Sandstone (Middle Cambrian) Producer defined Cba Bright Angel Shale (Middle Cambrian) Producer defined Locationsourceid Identifies source of location of this point feature. GeMS G. Billingsley George Billingsley Producer defined R.S. Crow Ryan Crow Producer defined S.P. Mavor Skyler Mavor Producer defined OrientationSourceID Identifies source of orientation data for this point feature. GeMS G. Billingsley George Billingsley Producer defined R.S. Crow Ryan Crow Producer defined S.P. Mavor Skyler Mavor Producer defined Notes Free text for additional information specific to this point feature. GeMS << empty cell >> No Data Producer defined Additional information about the measurement is populated in this field. Lat_NAD83 Latitude in the NAD83 datum. Producer Defined 36.00134369 36.11308567 degrees Long_NAD83 Longitude in the NAD83 datum. Producer Defined -112.2977715 -112.1006409 degrees OrientationPoints_ID Unique identifier for the individual measurements. Producer Defined Unique identifier text values in the ESRI Global ID 36-character format. 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://doi.org/10.5066/P1OXUWOP None 20250721 Skyler P Mavor USGS - SOUTHWEST REGION Research Geologist mailing and physical

Flagstaff Science Campus, Building 3

Flagstaff AZ 86001 928-556-7198 smavor@usgs.gov FGDC Biological Data Profile of the Content Standard for Digital Geospatial Metadata FGDC-STD-001.1-1999