Photographs and photomicrographs of selected pre-Middle Jurassic basement rocks beneath the Atlantic and Gulf Coastal Plains in Florida (ver. 1.1, June 2026)

This data release contains photographs and photomicrographs from drill cores and cuttings of pre-Middle Jurassic basement rocks that are buried beneath Coastal Plain sedimentary deposits in Florida. These samples provide rare insights into deeply buried rocks that have no surface exposures and no known exposed correlates. These images were acquired to support the characterization, discrimination, and correlation of map units comprising Florida’s basement infrastructure.

These are the original images. Annotated images with additional comments are available in the companion USGS Data Report #1209. Types of images included are hand sample photographs; optical photomicrographs in plane-, cross-polarized, and reflected light (PPL, XPL, and RL, respectively); and scanning electron microscope (SEM) images including back-scattered electron (BSE) images, cathodoluminescence (CL) images, and qualitative elemental abundance maps determined by energy dispersive spectroscopy (EDS). All images are in tag image file (.tif) or joint photographic experts group (.jpg) format. Contents of this release are: 1) a table of image information (FL_basement_images_table.csv), 2) a zipped folder containing two hundred nineteen (219) images (FL_basement_images.zip), 3) a data dictionary (FL_basement_images_data_dictionary.csv) defining attributes (column headings) in FL_basement_images_table.csv, 4) a key to image types (FL_basement_image_type_key.csv), and 5) metadata (FL_basement_images_metadata.xml). Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

First release: 2024
Revised: June 2026 (ver. 1.1)