Charles W. Holmes (retired) Debra Willard 2002 digital images http://sofia.usgs.gov/exchange/holmes/holmesxradio.html The x-radiographs of Florida Bay cores were used to examine the internal sediment structure of sediment contained in a core and assess whether the sediment was mixed. In order to manage an ecosystem, it is imperative to define the rate at which ecologic, physical and chemical changes have occurred. The lack of historical records documenting ecological changes dictates that other methods are used to measure the rate of change. A common method of "dating" change is to measure the decay of naturally occurring radioactive nuclides. 1994 1997 ground condition Complete None planned -81.1 -80.4 25.21 24.9 none radioactive isotopes radionuclides ecology geology hydrology piston core sediment cores ISO 19115 Topic Category 007 012 environment inlandWaters Department of Commerce, 1995, Countries, Dependencies, Areas of Special Sovereignty, and Their Principal Administrative Divisions, Federal Information Processing Standard (FIPS) 10-4, Washington, DC, National Institute of Standards and Technology United States US U.S. Department of Commerce, 1987, Codes for the identification of the States, the District of Columbia and the outlying areas of the United States, and associated areas (Federal Information Processing Standard 5-2): Washington, DC, NIST Florida FL Department of Commerce, 1990, Counties and Equivalent Entities of the United States, Its Possessions, and Associated Areas, FIPS 6-3, Washington, DC, National Institute of Standards and Technology Monroe County Miami-Dade County USGS Geographic Names Information System Florida Bay Cluett Key Bob Allen Key Rabbit Key Whipray Basin Rankin Bight Lake Ingraham Johnson Key Porjoe Key Pass Key Crocodile Point Trout Creek Little Madeira Bay none Central Everglades Russell Bank none none Debra A Willard U.S. Geological Survey mailing address

926A National Center

Reston VA 20192 703 648 5320 703 648 6953 dwillard@usgs.gov JPEG images Gough, L. P. Kotra, R. K.; Holmes, C. W.; Orem, W. H.; Hageman, P. L.; Briggs, P. H.; Meier, A. L.; Brown, Z. A. 2000 report USGS Open-File Report 00-327 Reston, VA U.S. Geological Survey http://sofia.usgs.gov/publications/ofr/00-327/ unknown unknown X-radiographs were made of cores from Rabbit Key, Cluett Key Pond, Whipray Basin,Bob Allen Key, Rankin Bight, Lake Ingraham, north and south Russell Bank, Johnson Key, Porjoe Key, Pass Key, Crocodile Point, Trout Creek Spiit, and Little Madeira Bay to assess sediment disturbance over the length of the cores. The x-radiographs were made in a hospital using their x-ray equipment. Unknown Debra A Willard U.S. Geological Survey mailing address

926A National Center

Reston VA 20192 703 648 5320 703 648 6953 dwillard@usgs.gov Florida Bay 0.01 0.01 Decimal degrees North American Datum of 1983 Geodetic Reference System 80 6378137 298.257 Heather S.Henkel U.S. Geological Survey mailing address

600 Fourth St. South

St. Petersburg FL 33701 USA 727 803-8747 ext 3028 727 803-2030 hhenkel@usgs.gov X-Radiographs Data No warrantees are implied or explicit for the data JPEG unknown 0.26 http://sofia.usgs.gov/exchange/holmes/holmesxradio.html Data may be downloaded from the SOFIA website none 20071031 Heather Henkel U.S. Geological Survey mailing and physical address

600 Fourth Street South

St. Petersburg FL 33701 USA 727 803-8747 ext 3028 727 803-2030 sofia-metadata@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998