TIFF image format of radiographs of gravity cores collected in 2008 by the U.S. Geological Survey around Puerto Rico and the U.S. Virgin Islands and accompanied by CSV and XLS files containing image lists and section information

Each core was cut into sections on the ship after collection. The cores were then split into halves back onshore. This process step and subsequent process steps were performed by the same person.

Once back onshore, digital x-radiographs of each core section were acquired at Falmouth Hospital (Falmouth, Massachusetts). The x-ray machine took approximately 30 cm interval photos of the cores. Each photo should overlap on each side with the preceding and succeeding interval by a few centimeters. The files were named for the core (ex 5GGC) then the section (1, 2, or 3) and then the interval (1, 2, 3, 4, or 5). The section numbers increase from bottom to top, while the interval numbers increase from top to bottom. The number in the photo is the frame number which increments consecutively from top to bottom. The excel spreadsheet (2008PR_radiographs.xls) give the image filename, the core from which is came, the interval of the total core represented, the frame number, and any additional notes. Within the images, the ruler measurement has a maximum value of 115 cm, so only represents the location within the section, not the core as a whole. For core 5GGC, the bottom-most section of the core is from the core cutter and indicates that in the filename (5GGC_cc_1) as opposed to having a section and interval number.
*The interval for core 33GGC is approximate because the core ran past the ruler. ** The bottom 47 cm of core 38GGC was not scanned
An example of a core and the order of the images from top to bottom is as follows:

5GGC_sect2_1
5GGC_sect2_2
5GGC_sect2_3
5GGC_sect2_4
5GGC_sect2_5
5GGC_sect1_1
5GGC_sect1_2
5GGC_sect1_3
5GGC_sect1_4
5GGC_sect1_5
5GGC_cc_1

Edits to the metadata were made to fix any errors that MP v 2.9.36 flagged. This is necessary to enable the metadata to be successfully harvested for various data catalogs. In some cases, this meant adding text "Information unavailable" or "Information unavailable from original metadata" for those required fields that were left blank. Other minor edits were probably performed (title, publisher, publication place, etc.). Added additional online links in the Identification section. The source information was incomplete and had to be modified to meet the standard. Fixed a link to data in the entity and attribute overview section. The metadata date (but not the metadata creator) was edited to reflect the date of these changes. The metadata available from a harvester may supersede metadata bundled within a download file. Compare the metadata dates to determine which metadata file is most recent.

Added keywords section with USGS persistent identifier as theme keyword.