Short Field
Name 
FullLength
Field Name 
Field Description 
GROUP 
Group 
Number assigned to data based on source
1 = Samples taken before start of the joint
USGS/WHOI
project
2 = USGS/WHOI
Atlantic Continental Margin Program stations
3 = Sediment entirely or partially analyzed, processed, or visually described by USGS Woods Hole scientists; most samples analyzed in the USGS Woods Hole Sediment Laboratory.

DB_ID 
USGS
unique sample identifier 
Unique identification number generated in the
sedimentation laboratory of the USGS's Woods Hole Coastal and Marine Science Center.
For samples analyzed after 1980 this identifier consists of 2
characters and 3 numerics (e.g. AS114). For samples analyzed before1980, this identifier consists of 4 numerics possibly
followed by as many as 2 characters. 
FIELD_NO 
Field Identifier 
Sample name or number as assigned in the field by the Chief
Scientist. 
PROJECT 
Project name 
Project name or number under which samples were
taken or data generated; sometimes project name indicates a more
specific area. 
CRUISE_ID 
Cruise ID 
Name or number of cruise on which sample collected. Historically
cruise identifiers were a combination of ship name, year of cruise
and cruise leg. In more recent years, cruise identifier is a
sequential serial number assigned to field activities within a
specific year. 
CONTACT 
Principal contact 
Name of Principal Investigator or Chief
Scientist responsible for data collection (usually first initial and
last name) 
AREA 
Area 
General geographic area of data collection.
Name is general enough to easily locate area on a state map. 
LATITUDE 
Latitude 
Latitude coordinate, in decimaldegrees, of
sample location. South latitude recorded as negative values. 
LONGITUDE 
Longitude 
Longitude coordinate, in decimal degrees, of sample location. West
longitude is recorded as negative values. 
DEPTH_M

Depth or sounding in meters 
Measured depth, in meters, of water overlying
sediment at sample time. Depth value is not corrected for tides. 
T_DEPTH 
Top depth 
Top depth of sample, in centimeters, below the sedimentwater
interface. 
B_DEPTH

Bottom depth 
Bottom depth of sample, in centimeters, below
the sedimentwater interface. 
DEVICE 
Sampling device 
Device used to collect the sample. 
MONTH_COLL

Month collected 
Calendar month sample collected. 
DAY_COLL 
Day collected 
Calendar day sample collected. 
YEAR_COLL

Year collected 
Calendar year sample collected. 
MONTH_ANAL 
Month analyzed 
Calendar month sample collected. 
DAY_ANAL 
Day analyzed 
Calendar day sample collected. 
YEAR_ANAL 
Year analyzed 
Calendar year sample collected. 
WEIGHT

Weight 
Weight of dry sample in grams. 
GRAVEL_PCT 
%Gravel 
Gravel content in percent dry weight of the sample (particles with
nominal diameters greater than 2
mm; 1 phi and larger. 
SAND_PCT 
%Sand 
Sand content in percent dry weight of sample
(particles with nominal diameters less than 2
mm
but greater than or equal to 0.0625 mm;
0 phi through 4 phi). 
SILT_PCT 
%Silt 
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 phi through 8 phi, inclusive). 
CLAY_PCT 
%Clay 
Clay content in percent dry weight of the sample
(particles with nominal diameters less than 0.004
mm; less than 8 phi). 
CLASSIFICATION 
Classification 
Sediment description based on rigorous definition (usually Shepard,1954).
Classes include:
GRAVEL – gravel equal to or greater than 50 percent
GRAVELLY SEDIMENT – gravel equal to or greater than 10 percent, but less than 50 percent.
SAND – sand equal to or greater than 75 percent
SILTY SAND  sand less than 75 percent and equal to or greater than 50 percent, silt greater than clay, and clay less than 20 percent
CLAYEY SAND  sand less than 75 percent and equal to or greater than 50 percent, clay greater than silt, and silt less than 20 percent
SILT  silt equal to or greater than 75 percent
SANDY SILT – silt less than 75 percent and equal to or greater than 50 percent, sand greater than clay, and clay less than 20 percent
CLAYEY SILT  silt less than 75 percent and equal to or greater than 50 percent, clay greater than sand, and sand less than 20 percent
CLAY – clay equal to or greater than 75 percent
SANDY CLAY  clay less than 75 percent and equal to or greater than 50 percent, sand greater than silt, and silt less than 20 percent
SILTY CLAY  clay less than 75 percent and equal to or greater than 50 percent, silt greater than sand, and sand less than 20 percent
SAND SILT CLAY – clay, sand, and silt greater than 20 percent each

MEDIAN 
Median 
Middle point in the grain size distribution in
phi units. 
MEAN 
Mean 
Average value in the grain size distribution in phi units. 
STDEV 
Standard deviation (sorting) 
Standard deviation (root mean square of the
deviations) of the grain size distribution in phi units. 
SKEWNESS 
Skewness 
Skewness (deviation from symmetrical form) of the grain size
distribution in phi units. 
KURTOSIS 
Kurtosis 
Kurtosis (degree of curvature near the mode) of
the grain size distribution in phi units. 
MODE1CLASS 
Mode 1 class 
First mode (particle size that occurs the most number of times) in
phi units. 
MODE1FREQ 
Mode 1 strength 
Modal strength of the first mode in percent. 
MODE2CLASS 
Mode 2 class 
Second mode in phi units. 
MODE2FREQ 
Mode 2 strength 
Modal strength of the second mode in percent. 
MODE3CLASS 
Mode 3 class 
Third mode in phi units. 
MODE3FREQ 
Mode 3 strength 
Modal strength of the third mode in percent. 
NMODES 
No. of modes 
Number of modes. 
PHIm5 
5 Phi 
Weight percent of the sample in the 5 phi
fraction and coarser (nominal diameter of particles greater than or
equal to 32mm); very coarse pebbles
to cobbles 
PHIm4 
4
Phi 
Weight percent of the sample in the 4 phi fraction (nominal
diameter of particles greater than or equal to 16mm,
but less than 32mm); coarse pebbles. 
PHIm3 
3 Phi 
Weight percent of the
sample in the 3 phi fraction (nominal diameter of particles greater
than or equal to 8mm, but less than
16mm); medium pebbles. 
PHIm2 
2 Phi 
Weight percent of the sample in the 2 phi
fraction (nominal diameter of particles greater than or equal to 4mm,
but less than 8mm); fine pebbles. 
PHIm1 
1 Phi 
Weight percent of the
sample in the 1 phi fraction (nominal diameter of particles greater
than or equal to2mm, but less than 4mm);
very fine pebbles (granules). 
PHI_0 
0 Phi 
Weight percent of the sample in the 0 phi
fraction (nominal diameter of particles greater than or equal to 1mm,
but less than 2mm); very coarse sand. 
PHI_1 
1 Phi 
Weight percent of the
sample in the 1 phi fraction (nominal diameter of particles greater
than or equal to 0.5mm, but less
than 1mm); coarse sand. 
PHI_2 
2 Phi 
Weight percent of the sample in the 2 phi
fraction (nominal diameter of particles greater than or equal to
0.25mm, but less than 0.5mm);
medium sand. 
PHI_3 
3 Phi 
Weight percent of the
sample in the 3 phi fraction (nominal diameter of particles greater
than or equal to 0.125mm, but less
than 0.25mm); fine sand. 
PHI_4 
4 Phi 
Weight percent of the sample in the 4 phi
fraction (nominal diameter of particles greater than or equal to
0.0625mm, but less than 0.125mm);
very fine sand. 
PHI_5 
5 Phi 
Weight percent of the
sample in the 5 phi fraction (nominal diameter of particles greater
than or equal to 0.031mm, but less
than 0.0625mm); coarse silt. 
PHI_6 
6 Phi 
Weight percent of the sample in the 6 phi
fraction (nominal diameter of particles greater than or equal to
0.016mm, but less than 0.031mm);
medium silt. 
PHI_7 
7 Phi 
Weight percent of the
sample in the7 phi fraction (nominal diameter of particles greater
than or equal to 0.008mm, but less
than 0.016mm); fine silt. 
PHI_8 
8 Phi 
Weight percent of the sample in the 8 phi
fraction (nominal diameter of particles greater than or equal to
0.004mm, but less than 0.008mm);
very fine silt. 
PHI_9 
9 Phi 
Weight percent of the
sample in the 9 phi fraction (nominal diameter of particles greater
than or equal to 0.002mm, but less
than 0.004mm); coarse clay. 
PHI_10 
10 Phi 
Weight percent of the sample in the 10 phi
fraction (nominal diameter of particles greater than or equal to
0.001mm, but less than 0.002mm);
medium clay. 
PHI_11 
11 Phi 
Weight percent of the
sample in the 11 phi fraction and finer (nominal diameter of
particles greater than or equal to 0.5(m); fine clay. 
ANALYST 
Analyst 
Name (usually first initial and last name)
of person who performed the grain size or physical properties
analysis. 
ANAL_COMM 
Comments on
analyses 
Any further information about sediment
analysis for all or specific parameters in this table. 
LITHOLOGY 
Lithology 
General lithologic description of sample. 
COMMENTS 
Comments 
Comments on sample collection or lithology. 