Florida Bay core logs disposition and analysis parameters

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Charles W. Holmes (retired)

Debra Willard

Publication_Date: Unknown
Title: Florida Bay core logs disposition and analysis parameters
Geospatial_Data_Presentation_Form: spreadsheet
Online_Linkage: <>
The data set contains the core number, location, latitude/longitude, date collected, storage location, core surface description, and analyses for cores taken from Rabbitt Key, Cluett Key, Whipray Basin, Bob Allen Key, Rankin Bight, Lake Ingraham, Russell Bank, Johnson Key, Porjoe Key, Trout Creek, Little Madeira Bay, Crocodile Point, Pass Key, and Park Key
The use of radioactive isotopes is founded on the known physical property of radioactive material, the half-life. A half-life of an isotope is the amount of time it takes for half of a given number of atoms to "decay" to another element. The age of objects that contain radioactive isotopes with known half-lives can be calculated by determining the percent of the remaining radioactive material. To use this method successfully certain other prerequisites must be met. These are: 1. the chemistry of the nuclide (element) is known; 2. once the nuclide is incorporated into the substrate the only change is radioactive decay, and 3. in order to be useful, it is relatively easy to measure.
Beginning_Date: 19940207
Ending_Date: 19970613
Currentness_Reference: ground condition
Progress: complete
Maintenance_and_Update_Frequency: none planned
West_Bounding_Coordinate: -81.096
East_Bounding_Coordinate: -80.4082
North_Bounding_Coordinate: 25.2091
South_Bounding_Coordinate: 24.9843
Theme_Keyword_Thesaurus: none
Theme_Keyword: core location
Theme_Keyword: radionuclides
Theme_Keyword: radioactive isotopes
Theme_Keyword: sediments
Theme_Keyword: nutrients
Theme_Keyword: surface disturbed zones
Theme_Keyword: piston core
Theme_Keyword: geology
Theme_Keyword: geochemistry
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: environment
Theme_Keyword: geoscientificInformation
Theme_Keyword: inlandWaters
Theme_Keyword: 007
Theme_Keyword: 008
Theme_Keyword: 012
Department of Commerce, 1995, Countries, Dependencies, Areas of Special Sovereignty, and Their Principal Administrative Divisions, Federal Information Processing Standard (FIPS) 10-4, Washington, D.C., National Institute of Standards and Technology
Place_Keyword: United States
Place_Keyword: 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, D. C., NIST
Place_Keyword: Florida
Place_Keyword: 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
Place_Keyword: Monroe County
Place_Keyword_Thesaurus: USGS Geographic Names Information System
Place_Keyword: Bob Allen Key
Place_Keyword: Cluett Key
Place_Keyword: Crocodile Point
Place_Keyword: Florida Bay
Place_Keyword: Johnson Key
Place_Keyword: Lake Ingraham
Place_Keyword: Little Madeira Bay
Place_Keyword: Pass Key
Place_Keyword: Porjoe Key
Place_Keyword: Rabbit Key
Place_Keyword: Rankin Bight
Place_Keyword: Taylor Slough
Place_Keyword: Trout Creek
Place_Keyword: Whipray Basin
Place_Keyword_Thesaurus: none
Place_Keyword: Central Everglades
Place_Keyword: Russell Bank
Access_Constraints: none
None. Acknowledgement of the U.S. Geological Survey would be appreciated for products derived from these data.
Contact_Person: Debra A Willard
Contact_Organization: U.S. Geological Survey
Address_Type: mailing address
Address: 926A National Center
City: Reston
State_or_Province: VA
Postal_Code: 20192
Contact_Voice_Telephone: 703 648 5320
Contact_Facsimile_Telephone: 703 648 6953
Marci Margot and Bowdewjn Remick assisted in analysis of the cores.
Native_Data_Set_Environment: MS Excel
Holmes, Charles W.

Robbins, John, Halley, Robert, Bothner, Michael, ten Brink, Marilyn, Marot, Marci

Publication_Date: 2001
Sediment dynamics of Florida Bay mud banks on a decadal time scale
Geospatial_Data_Presentation_Form: report
Series_Name: Bulletins of American Paleontology
Issue_Identification: 361
Publication_Place: Ithica, NY
Publisher: Paleontoligical Research Institution
in Paleoecological studies of South Florida

Bruce Wardlaw, editor

Logical_Consistency_Report: not applicable
Information is provided for all the cores used in the study. The list was revised 10/29/1997
Horizontal_Positional_Accuracy_Report: The location of sample sites was established by GPS.
Long cores (>1 m in length), were taken in >30 cm of water through the "moon pool" of a motorized 25 ft pontoon barge either grounded on the bank or anchored with 4 anchors. The location was established by GPS. A portable 12 ft high tripod was placed over the moon pool to hold the coring piston and for extraction of the core. Cores were taken with 10.8 cm-diameter, clear, FDA food grade polycarbonate tubing. A PVC piston with two O-ring seals was used. The piston was pushed into the bottom of the core tube to a position several cm above the bottom of the tube. A 10 m length of .25 cm diameter braided polypropylene line, attached to a ring threaded into the top of the piston, was pulled through the core tube. The core tube was then carefully lowered through the moon pool and any air trapped in the space between piston and the bottom of the core tube was removed and filled with water. When the tube was several cm above the bottom, the free end of line attached to the piston was affixed to the head of the tripod. Thus when the core tube penetrates the sediment, the piston remains in a fixed position a few cm above the sediment surface producing a vacuum that retards compaction. When the apparatus was set in position, the core tube was quickly thrust about 30 cm into the sediment by hand. Next, an aluminum clamp with handles was fixed to the core tube and two people then forced the core barrel in until it reached the underlying Pleistocene limestone. Next the clamp with handles was removed and a clamp with lifting rings was attached near the air/water interface. A cable through a pulley at the top of the tripod and attached to a hand winch mounted on one leg of the tripod was attached to the lifting ring on the clamp. The cable winch was necessary for extraction due to the weight of the core and strong suction created by the mud. Before extraction, the polypropylene line was removed from the tripod and fixed to the extraction clamp. This was to ensure that the piston remained in a fixed position during extraction and to retard loss of sediment from the bottom of the barrel. A benefit of the clear core tubing was that any leakage around the piston's O-ring seal could be readily observed during the extraction process. A person in the water wearing a face mask observed the core tube to be certain no sediment was lost at the sediment/water interface, to record any elevation difference between the sediment surface inside and outside the core at full penetration, and to quickly place a plastic pipe cap on the bottom of the core as it emerged from the sediment. The core was winched above the surface of the moon pool and lowered to rest vertically on deck. The pipe cap was taped tightly to the tube to prevent leakage. Excess tubing was cut off just below the piston using a large pipe cutter so the piston could be carefully removed without disturbing the sediment surface. In some cases the water above the sediment was carefully siphoned off with a tube to prevent sloshing of water during transport to the laboratory which would disturb the sediment surface. In other cases the piston was left in the core tube during transport. All cores were transported vertically. Each evening cores were transported vertically to a local hospital where X-ray photographs were prepared.

The cores were selected for analysis based on the x-rays. Those cores selected for further analysis were selected on the basis of laminations or other features which indicated the lack of disturbance. The core was placed in an extruding device vertically. The core was then extruded up into a template and sliced. This slice (hockey puck) was place on a preweighed titanium plate and the wet weight determined. The ring was then removed and the slice was trimmed to remove the outer portion of the core. This was done to prevent any contamination that may have occurred at the side of the core barrel during the coring operation. This sample was then bagged and weighed. This weight was found to be important in the determination of water content and thus the dry weight as water was lost during the period of initial sampling and the laboratory analysis. These sample were then stored in a refrigerator and then transhipped to the home based laboratory. For those core selected for trace metal analysis, the slices were sampled from the center of the "hockey puck" with titanium tools and place in an acid washed plastic bottle and frozen.

Process_Date: Unknown
Contact_Person: Debra A Willard
Contact_Organization: U.S. Geological Survey
Address_Type: mailing address
Address: 926A National Center
City: Reston
State_or_Province: VA
Postal_Code: 20192
Contact_Voice_Telephone: 703 648 5320
Contact_Facsimile_Telephone: 703 648 6953

Indirect_Spatial_Reference: Florida Bay

Latitude_Resolution: 0.01
Longitude_Resolution: 0.01
Geographic_Coordinate_Units: Decimal degrees
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.257

The spreadsheet contains the following information: Core No., Location, Latitude, Longitude, Date Collected, Storage Location, Core Surface Description, and Analyses.
Entity_and_Attribute_Detail_Citation: USGS personnel

Contact_Person: Heather S.Henkel
Contact_Organization: U.S. Geological Survey
Address_Type: mailing address
Address: 600 Fourth St. South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: 727 803-8747 ext 3028
Contact_Facsimile_Telephone: 727 803-2030
Resource_Description: Florida Bay Core Logs Disposition and Analysis Parameters
Distribution_Liability: The data have no implied or explicit guarantees
Format_Name: MS Excel
Format_Version_Date: 1997
Transfer_Size: 0.02
Network_Resource_Name: <>
Access_Instructions: Data may be downloaded from the SOFIA website
Fees: none

Metadata_Date: 20071031
Contact_Person: Heather Henkel
Contact_Organization: U.S. Geological Survey
Address_Type: mailing and physical address
Address: 600 Fourth Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: 727 803-8747 ext 3028
Contact_Facsimile_Telephone: 727 803-2030
Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998

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U.S. Department of the Interior, U.S. Geological Survey
Comments and suggestions? Contact: Heather Henkel - Webmaster
Generated by mp version 2.8.18 on Wed Oct 31 14:54:38 2007