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publications > open file report > OFR 2006-1271 > methods
Descriptions and Preliminary Report on Sediment Cores from the Southwest Coastal Area, Part II: Collected July 2005, Everglades National Park, Florida
METHODS
Twelve piston cores were collected from six sites in Everglades National Park on July 12 and 14, 2006 (Table 2; Figures 1 and 4) under ENP Permit # EVER- 2004-SCI-0099. Duplicate cores, A and B, were taken side by side at each site (10-20 cm apart for most cores, ~1m apart for GLW705-SBLMA & B). X-radiographs of the A cores were made, and the upper 20 cm of each A core were cut vertically into 1-cm segments for analyses; below 20 cm the samples were cut into 2-cm segments. The subset A cores are currently undergoing analysis for faunal remains (ostracodes, foraminifers and mollusks), pollen, radiometric dating, and sedimentary and shell geochemistry. The B cores will be sliced vertically, digitally scanned, and sub-sampled for microbial DNA where appropriate. Portions of the subset B cores will be archived for future additional analyses.
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| Figure 4. Digital Orthophoto Quadrangles (DOQs) showing July 2005 core locations. A. Composite of four DOQs from Shark River and Harney River areas. SR1=Shark River, near entrance to Ponce de Leon Bay plotted on overlap between Whitewater Bay W NW and Harney River SW DOQs. SR2=Shark River system, north of main channel plotted on Harney River SW DOQ. SHR1=South Harney, near mouth of South Creeks plotted on Shark Point SE DOQ. HR1=Harney River, near water station plotted on Harney River SW DOQ. All images obtained from http://edcsns17.cr.usgs.gov/EarthExplorer/ [larger image] |
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| Figure 4. (Continued) B. Composite of four DOQs from the Lostmans River area. FBLM1=First Bay of Lostmans River plotted on Lostmans Ranger Station SW DOQ. SBLM2=Second Bay of Lostmans River plotted on Lostmans Ranger Station NE DOQ. All images obtained from http://edcsns17.cr.usgs.gov/EarthExplorer/ [larger image] |
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| Table 2: List of cores collected in July 2005 in the southwest coastal area of Everglades National Park. See Figures 1 and 2 for locations. |
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| [Click here to see entire table] |
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Processing of faunal and floral remains within the cores is currently underway and will follow the procedures described in Cronin and others (2001), Brewster-Wingard and others (2001), Ishman and others (1998), and Willard and others (2001). In order to provide a quick overview of significant environmental changes taking place within these cores for this report, samples were scanned for their molluscan faunal content. These scans are quick visual identifications of the observable mollusks and do not constitute a thorough or quantitative examination. The observed presence of key environmental and/or salinity-indicator molluscan species is noted in Table 3.
| Table 3: Presence (P) of mollusks that serve as key salinity and/or environmental indicators is shown on table. Note: this list does not represent all mollusks present in the samples. Also, three cores were not processed (Lostmans River, First and Second Bay cores and Harney core near water monitoring station); mollusks were examined in the samples during description, and are therefore biased towards the larger taxa. "No visible shell material" means no obvious molluscan shell material present. Closer examination of samples may indicate occurrences of mollusks. |
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| [Click here to see entire table] |
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