Skip USGS links group
U.S. Geological Survey - science for a changing world
NOAA logo with link to NOAA home page >CZM logo with link to CZM home page

Woods Hole Science Center

End of USGS links group

Sea-Floor Character and Sedimentary Processes of Great Round Shoal Channel, Offshore Massachusetts


Sediment Data

Skip past contents information
Title Page
Introduction
Setting
Methods
Overview
Discussion
Interpretation
Data Catalog
Acknowledgments
References
List of Figures
Bottom Photographs
Sediment Data
Contacts
Disclaimers

Click on figure for larger image.

Figure 15. Map showing the station locations used to verify the acoustic data with bottom sampling and photography during the RAFAEL 06005 cruise.
Figure 15. Map showing the station locations used to verify the acoustic data with bottom sampling and photography during the RAFAEL 06005 cruise.

The sediment grain-size dataset provided here contains information on the collection, location, description, and texture of sediments at stations occupied during the verification cruise RAFAEL 06005 (fig. 15). All analyses were conducted in the sedimentation laboratory at the USGS's Woods Hole Science Center. Records without textural data and statistics are based on visual descriptions. The basic structure of the data is in "flat-file" format, a matrix where records are rows representing individual samples and the columns contain sample- and station-specific information. This matrix contains 43 fields which are defined in the Data Dictionary below.

The sediment data are provided in two formats: Microsoft Excel and delimited ASCII text format. In the delimited ASCII text file, each field or column of data is separated from the next by commas and can be downloaded into many types of software.

raf06005_seddata.xls
raf06005_seddata.txt

Data Dictionary

An integral part of any database is the dictionary that explains the structure and content. It contains a list of the fields and the definitions of parameters measured. Data utilization is facilitated by reference to this compilation because it defines abbreviations and lists field names.

LABNO - Unique sample identifier assigned in the laboratory

STATIONID - Sample name or number as assigned in the field

PROJECTID - Project under which samples were taken or data generated

CRUISEID - Name or number of cruise on which sample collected or station occupied

PRINCIPAL - Name of Principal Investigator

MONTH - Calendar month sample analyzed

DAY - Calendar day sample analyzed

YEAR - Calendar year sample analyzed

LATITUDE - Latitude in decimal degrees

LONGITUDE - Longitude in decimal degrees (west longitudes are negative values)

DEVICE - Device used to collect the sample

AREA - General geographic area

DEPTH_M - Measured depth of water overlying sediment at sample time, not corrected for tides, in meters

T_DEPTH - Top depth of the sample below the sediment-water interface, in cm

B_DEPTH - Bottom depth of the sample below the sediment-water interface, in cm

WEIGHT - Weight of sample in grams

ZGRAVEL - Gravel content in percent dry weight of the sample (particles with nominal diameters greater than 2 mm; -1 phi and larger)

ZSAND - Sand content in percent dry weight of the sample (particles with nominal diameters less than 2 mm, but greater than or equal to 0.0625 mm ; 0 through 4 phi)

ZSILT - Silt content in percent dry weight of the sample (particles with nominal diameters less than 0.0625 mm, but greater than or equal to 0.004 mm; 5 through 8 phi, inclusive)

ZCLAY - Clay content in percent dry weight of the sample (particles with nominal diameters less than 0.004 mm; 9 phi and smaller)

SEDCLASS - Sediment description based on a rigorous definition (Shepard, 1954)

MEDIAN - Middle point in the grain size distribution in phi units

MEAN - Average value in the grain size distribution in phi units

STDDEV - Standard deviation (root mean square of the deviations) of the grain size distribution in phi units (i.e., sorting)

SKEWNESS - Deviation from symmetrical form of the grain size distribution in phi units

KURTOSIS - Degree of curvature near the mode of the grain size distribution in phi units

PHI_11 - Weight percent of the sample in the 11 fraction (nominal diameter of particles greater than or equal to 0.5 µm, but less than 0.001 mm); fine clay

PHI_10 - Weight percent of the sample in the 10 fraction (nominal diameter of particles greater than or equal to 0.001 mm, but less than 0.002 mm); medium clay

PHI_9 - Weight percent of the sample in the 9 fraction (nominal diameter of particles greater than or equal to 0.002 mm, but less than 0.004 mm); coarse clay

PHI_8 - Weight percent of the sample in the 8 fraction (nominal diameter of particles greater than or equal to 0.004 mm, but less than 0.008 mm); very fine silt

PHI_7 - Weight percent of the sample in the 7 fraction (nominal diameter of particles greater than or equal to 0.008 mm, but less than 0.016 mm); fine silt

PHI_6 - Weight percent of the sample in the 6 fraction (nominal diameter of particles greater than or equal to 0.016 mm, but less than 0.031 mm); medium silt

PHI_5 - Weight percent of the sample in the 5 fraction (nominal diameter of particles greater than or equal to 0.031 mm, but less than 0.0625 mm); coarse silt

PHI_4 - Weight percent of the sample in the 4 fraction (nominal diameters of particles greater than or equal to .0625 mm, but less than 0.125 mm); very fine sand

PHI_3 - Weight percent of the sample in the 3 fraction (nominal diameter of particles greater than or equal to 0.125 mm, but less than 0.25 mm); fine sand

PHI_2 - Weight percent of the sample in the 2 fraction (nominal diameter of particles greater than or equal to 0.25 mm, but less than 0.5 mm); medium sand

PHI_1 - Weight percent of the sample in the 1 fraction (nominal diameter of particles greater than or equal to 0.5 mm, but less than 1 mm); coarse sand

PHI_0 - Weight percent of the sample in the 0 fraction (nominal diameters of particles greater than or equal to 1 mm, but less than 2 mm); very coarse sand

PHIM1 - Weight percent of the sample in the -1 fraction (nominal diameter of particles greater than or equal to 2 mm, but less than 4 mm); very fine pebbles (granules)

PHIM2 - Weight percent of the sample in the -2 fraction (nominal diameter of particles greater than or equal to 4 mm, but less than 8 mm); fine pebbles

PHIM3 - Weight percent of the sample in the -3 fraction (nominal diameter of particles greater than or equal to 8 mm, but less than 16 mm); medium pebbles

PHIM4 - Weight percent of the sample in the -4 fraction (nominal diameter of particles greater than or equal to 16 mm, but less than 32 mm); coarse pebbles

PHIM5 - Weight percent of the sample in the -5 fraction (nominal diameter of particles greater than or equal to 32 mm; very coarse pebbles to boulders

NOTE: Microsoft Excel software is necessary to view spreadsheets in XLS format.


Skip past contents informationTitle | Introduction | Setting | Methods | Overview | Discussion | Interpretation | Data Catalog | Acknowledgments | References | Figures | Bottom Photographs | Sediment Data | Contacts

Skip Navigation

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo USAGov logo U.S. Department of the Interior | U.S. Geological Survey

URL: woodshole.er.usgs.gov/pubs/of2007-1138/html/sedimentdata.html
Page Contact Information: WHSC Webmaster
This page last modified on Wednesday, 03-Oct-2007 12:37:37 EDT