APP-07_AgeDates - Location of radiocarbon age dates sampled from vibracores collected by the U.S. Geological Survey within Apalachicola Bay, Florida, 2007 (points)

Metadata also available as - [Outline] - [Parseable text]

Frequently-anticipated questions:

What does this data set describe?

Title:
APP-07_AgeDates - Location of radiocarbon age dates sampled from vibracores collected by the U.S. Geological Survey within Apalachicola Bay, Florida, 2007 (points)
Abstract:
In 2007, the U.S. Geological Survey collected 24 vibracores within Apalachicola Bay, Florida. The vibracores were collected using a Rossfelder electric percussive (P-3) vibracore system during a cruise on the R/V Gilbert. Selection of the core sites was based on a geophysical survey that was conducted during 2005 and 2006 in collaboration with the National Oceanic and Atmospheric Administrations (NOAA) Coastal Services Center (CSC) and the Apalachicola Bay National Estuarine Research Reserve. Available data include the vibracore data logs and photographs, select seismic-reflection profiles (from the geophysical survey), and core-derived data including: grain size analyses, radiocarbon ages, microfossil counts, and sedimentological interpretations. The long-term goal of this study is to provide maps, data, and assistance to the Apalachicola Bay National Estuarine Research Reserve in their effort to monitor and understand the geology and ecology of Apalachicola Bay Estuary. These data will inform coastal managers charged with resource preservation.
  1. How should this data set be cited?

    U.S. Geological Survey, 2009, APP-07_AgeDates - Location of radiocarbon age dates sampled from vibracores collected by the U.S. Geological Survey within Apalachicola Bay, Florida, 2007 (points): Open-File Report 2009-1031, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.

    Online Links:

    This is part of the following larger work.

    Twichell, D., Pendleton, E., Poore, R., Osterman, L., and Kelso, K., 2009, Vibracore, Radiocarbon, Microfossil, and Grain-Size Data from Apalachicola Bay, Florida: Open-File Report 2009-1031, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -85.074083
    East_Bounding_Coordinate: -84.916167
    North_Bounding_Coordinate: 29.691900
    South_Bounding_Coordinate: 29.605850

  3. What does it look like?

    <https://pubs.usgs.gov/of/2009/1031/images/age_loc.jpg> (JPEG)
    Radiocarbon age date locations within Apalachicola Bay, Florida

  4. Does the data set describe conditions during a particular time period?

    Beginning_Date: 22-May-2007
    Ending_Date: 26-May-2007
    Currentness_Reference: ground condition

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: vector digital data

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a Vector data set. It contains the following vector data types (SDTS terminology):

      • Entity point (34)

    2. What coordinate system is used to represent geographic features?

      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.000001. Longitudes are given to the nearest 0.000001. Latitude and longitude values are specified in Decimal degrees.

      The horizontal datum used is D_WGS_1984.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257224.

      Vertical_Coordinate_System_Definition:
      Depth_System_Definition:
      Depth_Datum_Name: Mean lower low water
      Depth_Distance_Units: meters
      Depth_Resolution: 0.5
      Altitude_System_Definition:
      Altitude_Encoding_Method:
      Explicit elevation coordinate included with horizontal coordinates
      Altitude_Resolution: 0.000000

  7. How does the data set describe geographic features?

    APP-07_AgeDates
    ESRI point shapefile representing the location of 34 radiocarbon age dates produced from 10 vibracores that were collected within Apalachicola Bay, Florida in 2007. (Source: U.S. Geological Survey)

    Shape
    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    FID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    LAT_DD
    Latitude of core in decimal degrees (WGS84) (Source: U.S. Geological Survey)

    Range of values
    Minimum:29.60585
    Maximum:29.6919
    Units:signed decimal degrees
    Resolution:.00000001

    LON_DD
    Longitude of core in decimal degrees (WGS84) (Source: U.S. Geological Survey)

    Range of values
    Minimum:-85.074083
    Maximum:-84.916167
    Units:signed decimal degrees
    Resolution:.00000001

    W_DEPTH_m
    water depth (meters) at core location (MLLW) (Source: U.S. Geological Survey)

    Range of values
    Minimum:-3.72
    Maximum:-1.87
    Units:meters
    Resolution:.01

    CRUISE_ID
    ID associated with cruise aboard the R/V Gilbert of St. Petersburg, FL (Source: U.S. Geological Survey)

    Character string

    SITE_ID
    Identification number for planned vibracore sites (Source: U.S. Geological Survey)

    Character string

    CORE_ID
    ID name given to core based on cruise number and core site (Source: U.S. Geological Survey)

    Character string

    CORE_L_cm
    total length of core (cm) (Source: U.S. Geological Survey)

    Range of values
    Minimum:398
    Maximum:547
    Units:centimeters
    Resolution:0.5

    DATE_COLL
    Month, day, and year of core collection (DD-MON-YR) (Source: U.S. Geological Survey)

    Character string

    DEVICE
    Device used for core collection (Source: U.S. Geological Survey)

    Character string

    LOCATION
    Geographic area within Apalachicola Bay of core collection (Source: U.S. Geological Survey)

    Character string

    SAMPLE_ID
    ID name given to core sample based on cruise number, core site, and the top (in cm) of the radiocarbon sample. (Source: U.S. Geological Survey)

    Character string

    SAM_TOP_cm
    top of radiocarbon sample (Source: U.S. Geological Survey)

    Range of values
    Minimum:52
    Maximum:547
    Units:cm
    Resolution:0.5

    SAM_BOT_cm
    bottom of radiocarbon sample (Source: U.S. Geological Survey)

    Range of values
    Minimum:54
    Maximum:547
    Units:cm
    Resolution:0.5

    DATE_ANALY
    month, day, and year that the radiocarbon sample was analyzed (Source: U.S. Geological Survey)

    Character string

    MATERIAL
    type of material collected for radiocarbon analysis (Source: U.S. Geological Survey)

    ValueDefinition
    shellthe material was a type of shell (i.e. oyster shell)
    woodthe material was a type of wood (i.e. tree fragment)

    C14_AGE
    age of the sample in uncorrected radiocarbon years before 1950 (Source: U.S. Geological Survey)

    Range of values
    Minimum:900
    Maximum:54200
    Units:years
    Resolution:5

    AGE_ERROR
    error associated with radiocarbon age determination (Source: U.S. Geological Survey)

    Range of values
    Minimum:35
    Maximum:2800
    Units:years
    Resolution:5

    Entity_and_Attribute_Overview:
    Data within this file are related to radiocarbon subsamples from 10 vibracores. For whole-core determinations please refer to that file within the data catalog: APP-07_CoreLocations..

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

  3. To whom should users address questions about the data?

    David C. Twichell
    U.S. Geological Survey
    Oceanographer
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598

    (508) 548-8700x2266 (voice)
    (508) 457-2310 (FAX)
    dtwichell@usgs.gov

Why was the data set created?

This data set contains spatial and radiocarbon age information for 10 of the 24 vibracores collected by the U.S. Geological Survey during a 2007 cruise within Apalachicola Bay, Florida. These data are available in shapefile, CSV, and XLS format.

How was the data set created?

  1. From what previous works were the data drawn?

    USGS (source 1 of 1)
    U.S. Geological Survey, Unpublished Material, vibracores collected by the U.S. Geological Survey within Apalachicola Bay, FL.

    Type_of_Source_Media: paper
    Source_Contribution:
    Twenty-four vibracores were collected within Apalachicola Bay, Florida during May 2007. Vibracore sites were selected based on the identification of target areas. These target areas were chosen from the analysis of geophysical data collected during 2005 and 2006 in collaboration with the National Oceanic and Atmospheric Administrations (NOAA) Coastal Services Center (CSC) and the Apalachicola Bay National Estuarine Research Reserve. The vibracores were collected using a Rossfelder electric percussive (P-3) vibracore system. The cores were collected in a 7.62 cm (3 in) diameter by 6.10 m (20 ft) long aluminum tube with a copper core catcher riveted to the bottom. The vibracoring rig was mounted, depolyed, and recovered on the port side of the R/V Gilbert. The ship was anchored from the bow and stern to maintain ship position as a hydraulic crane deployed and recovered the coring rig. Following recovery, the bottom of the core was capped with a plastic cap, water was drained from the top of the core barrel by drilling a hole in the aluminum tube immediately above the sediment/water interface, and the pipe was cut at the sediment/water interface. Each core was cut into one-meter sections (measuring down from the sediment/water interface) on the boat deck, the ends were capped, each section labeled, and stored on deck for transport. Core sections for all 24 vibracores were transported to the U.S. Geological Survey Florida Integrated Science Center (FISC) where the 1-meter core sections were split in half (lengthwise), described, and photographed in the FISC core laboratory. One half of each core section was preserved and archived in a clear plastic sleeve with the ends taped shut to minimize moisture loss. The other half, the working half, of the core was used for visual descriptions, photographs, and eventually sub-sampling. Visual core descriptions were recorded on field sheets that contained information regarding: cruise, core number, describer, general station location, lithologic units, sedimentary structures, biota, and a depiction of the stratigraphic column. The cores were photographed by aligning all sections of a vibracore abreast with depth indicators located between sections. After photographing, all core sections were wrapped in plastic sleeves with the ends taped shut to minimize moisture loss, and stored in labeled cardboard boxes in the FISC core repository.

  2. How were the data generated, processed, and modified?

    Date: 2007 (process 1 of 3)
    Wood fragments and shells were collected within select vibracores for radiocarbon age analysis. In total 34 radiocarbon ages were produced from wood fragments and shells in 10 of the 24 vibracores. Wood and shell samples were converted to graphite targets at a U.S. Geological Survey laboratory in Reston, VA, and the AMS 14C ages were determined on these targets at the Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory in Livermore, CA. The age results were recorded in a spreadsheet (Microsoft Office Excel 2003) including: core location, core id, top of sample, base of sample, material dated, 14C age, and age error. All dates were 14C dates (in years before 1950) and had no corrections applied to them.

    Person who carried out this activity:

    Richard Z. Poore
    U.S. Geological Survey
    Geologist
    600 4th Street South
    St. Petersburg, FL 33701

    (727) 803-8747x3131 (voice)
    727) 803-2032 (FAX)
    rpoore@usgs.gov

    Date: 2009 (process 2 of 3)
    Vibracore location and radiocarbon age information was exported from the spreadsheet (Microsoft Office Excel 2003) as a comma-separated value (CSV) file and imported to ArcCatalog (version 9.3) by right-clicking on the CSV file and selecting 'create feature class --> from XY table'. Parameters for the import are: X Field - longitude; Y Field - latitude; Z Field - water depth. This process created an ESRI point Z shapefile where each subsample from a vibracore is a unique record with sample specific attributes. The original depth value (Z) was recorded in the spreadsheet from the ship's fathometer (not tide corrected). This value was replaced in ArcGIS using XTools Pro (version 5.2) for ArcGIS desktop --> Table Operations -->Add X,Y,Z coordinates. Only the Z coordinate was added using z-values from the tide-corrected (MLLW) basemap: apbaybath25m. This created a vertical measue of water depth at each core location in meters below MLLW.

    Person who carried out this activity:

    Elizabeth A. Pendleton
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598

    (508) 548-8700x2259 (voice)
    (508) 457-2310 (FAX)
    ependleton@usgs.gov

    Date: 2009 (process 3 of 3)
    The final radiocarbon shapefile was exported to Microsoft Excel format (XLS) and Comma-Separated Value (CSV) format using ArcMap (version 9.3) and XTools Pro (version 5.2) for ArcGIS desktop. This final export to CSV and XLS format was done to include the ESRI generated fields in all formats of the data, and to correct the Z-value to MLLW in all files.

    Person who carried out this activity:

    Elizabeth A. Pendleton
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598

    (508) 548-8700 x2259 (voice)
    (508) 457-2310 (FAX)
    ependleton@usgs.gov

  3. What similar or related data should the user be aware of?

    Twichell, D., Andrews, B., Edmiston, H., and Stevenson, W., 2007, Geophysical Mapping of Oyster Habitats in a Shallow Estuary; Apalachicola Bay, Florida: U.S. Geological Survey Open-File Report 2006-1381, U.S. Geological Survey, Woods Hole Science Center, Woods Hole, MA.

    Online Links:

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?

    All attributes were checked to ensure that the data translation from spreadsheet to shapefile and back was correct.

  2. How accurate are the geographic locations?

    The vibracore location for these data were recorded from the ship's Differential Global Positioning System (DGPS); they are accurate to +/- 1 to 2 meters, horizontally. Additionally, the ship was anchored from the stern and bow during vibracore collection, and this configuration could create extra horizontal uncertainty. Core locations are assumed to be accurate within +/- 20 meters.

  3. How accurate are the heights or depths?

    The water depth value in the attribute table is taken from the 25-m Apalachicola Bathymetric grid included in this report. Please see the metadata file for apbaybath25m for more detailed vertical accuracy information.

  4. Where are the gaps in the data? What is missing?

    Navigation from ship GPS was used to generate this shapefile. All vibracores were collected from the R/V Gilbert using a Rossfelder vibracore. One vibracore was collected at each of the 23 predetermined locations, with the exception of site 18. Two cores were collected here because the first core (App07-18A) was recovered without a core catcher on the end, and several centimeters of the sample were lost. A second core was taken (App07-18B) at site 18, and both cores were processed and preserved. Of the 24 vibracores collected, 10 were selected for radiocarbon age date sampling. This file contains sample data from within these 10 selected vibracores

  5. How consistent are the relationships among the observations, including topology?

    Any spurious data points were removed during creation of the spreadsheet file. These data are related to centimeter-scale subsamples within vibracores collected by USGS in 2007. The whole-core determinations are located in a separate file.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints: None
Use_Constraints:
The Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the originator of the dataset.

  1. Who distributes the data set? (Distributor 1 of 1)

    David C. Twichell
    U.S. Geological Survey
    Oceanographer
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598

    (508) 548-8700x2266 (voice)
    (508) 457-2310 (FAX)
    dtwichell@usgs.gov

  2. What's the catalog number I need to order this data set?

    Downloadable Data

  3. What legal disclaimers am I supposed to read?

    Neither the U.S. Government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

  4. How can I download or order the data?

  5. What hardware or software do I need in order to use the data set?

    This zip file contains data available in Environmental Systems Research Institute (ESRI) point shapefile (.shp), Microsoft Excel Spreadsheet (.xls), and comma separated text (.csv) format. The user must have ArcGIS or ArcView 3.0 or greater software to read and process the shapefile, Microsoft Excel 2003 or higher to read the XLS file, or any text-reading software will open the CSV file. In lieu of ArcView or ArcGIS, the user may utilize another GIS application package capable of importing the data. A free data viewer, ArcExplorer, capable of displaying the data is available from ESRI at www.esri.com.

Who wrote the metadata?

Dates:
Last modified: 15-Jul-2009
Metadata author:
Elizabeth A. Pendleton
U.S. Geological Survey
Geologist
384 Woods Hole Road
Woods Hole, MA 02543-1598
USA

508-548-8700 x2259 (voice)
(508)-457-2310 (FAX)
ependleton@usgs.gov

Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:

Generated by mp version 2.8.25 on Wed Jul 15 14:24:38 2009