Thin section images from hand samples from the Lady of the Lake intrusion, Montana.

This dataset includes photographic images of thin sections created from hand samples collected from the Lady of the Lake intrusion, Montana, a shapefile representing the locations of the hand samples, and images showing examples of the approximate scale on the images. The samples were collected in order to help define platinum group element (PGE), gold, and titanium vanadium iron resources associated with the Lady of the Lake intrusion. The images of the entire thin section, in plane-polarized (PPL) and cross-polarized light (XPL), were taken using a high-resolution digital camera on a macro stand. The PPL and XPL images were exported from the camera in both raw .CR2 and compressed .jpg format. Reflected light (RL) images of the thin sections were taken using a Keyence VHX-7000 digital microscope. The RL images were exported from the Keyence as .tif images. Thin sections with a coverslip were not imaged in reflected light. The data are organized into two zip files, one containing the thin section images (LotL_thin_section_images.zip), and one containing a shapefile of the locations of the hand samples (LadyoftheLake_thinsection_sample_locations_shapefile.zip). The thin section images are in two folders, one containing the 'RAW' unprocessed .CR2 images and associated .xmp metadata files, and unprocessed .tif images (LotL_Original_Images), and another folder containing processed .jpg images (LotL_Processed_Images). The processed images were run through a series of tools in Photoshop in order to improve the appearance of the images. The images taken in reflected light were not run through the Photoshop processing. The file name of each photograph correlates to the hand sample ID from which the thin section was sourced, and whether the photograph represents a plane-polarized (PPL), cross-polarized (XPL), or reflected (RL) light image. For example, the "LL90-17_XPL.JPG" file is a cross-polarized image of the thin section sourced from the "LL90-17" hand sample. The RL images include a scale bar. The PPL and XPL images do not show a scale bar, however the thin section holder, viewable in the images, can be used as an approximate scale bar. The width of the rectangular opening of the thin section holder is approximately 48 millimeters wide. See the "Scale_bar_example_PPL.JPG" and "Scale_bar_example_XPL.JPG" image files for examples. The image files have Section 508 compliant metadata as per USGS section 508 compliancy officer guidelines. The .xmp files are included with the 'RAW' .CR2 files because the original .CR2 metadata cannot be altered. In order to add descriptive information to the metadata, the .xmp files must be included. The image metadata for the .jpg and .tif files can be viewed using software such as Adobe Photoshop, Adobe Bridge, or Windows file explorer. The raw .CR2 images edited metadata (.xmp files) can be viewed in Adobe Photoshop and Adobe Bridge, but is not viewable using Windows file explorer. For the .CR2 images, only the original metadata, created when the photograph was taken, can be be viewed using Windows file explorer.

[
  "010:12"
]

[
  "geospatial"
]