CRLS98014 Sediment Grab Samples

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: David C. Twichell
Publication_Date: 20000120
Title: CRLS98014 Sediment Grab Samples
Publication_Information:
Publication_Place: Woods Hole, MA
Publisher: U.S. Geological Survey
Description:
Abstract:
Two 21-day field operations were conducted in 1997 and 1998 in the estuaries and on the inner continental shelf off the northern Oregon and southern Washington coast. These cruises aboard the R/V Corliss were run in order to generate reconnaissance maps of the seafloor geology and the shallow subsurface stratigraphy using sidescan-sonar and seismic-reflection mapping techniques. The 1998 cruise also collected sediment grab samples, bottom photographs, and video images to verify the sidescan-sonar imagery and to document the seafloor geology. The combination of these data with previously collected sediment sample data (Robert, 1974; Nittrouer, 1978; and Smith et. al., 1980) has been used to define the extent and lithology of shelf sediments associated with the Columbia River littoral cell. This work is one component of a larger project studying the erosion of the Washington Oregon coasts and is being coordinated by the U.S. Geological Survey and the Washington State Department of Ecology. The reasons for collecting these data are to provide a regional synthesis of the offshore geology for this project and to support a wide variety of management decisions and to provide a basis for further process-oriented investigations.
Purpose:
This GIS overlay contains sediment sample locations and analyses information collected aboard the R/V Corliss in 1998.
Supplemental_Information:
Roberts, R.W., 1974, Marine sedimentological data of the Washington continental shelf: University of Washington, Department of Oceanography Special Report 57, 129p.

Nittrouer, C.A., 1978, The process of detrital sediment accumulation in a continental shelf environment: an examination of the Washington shelf: PhD Thesis, University of Washington, Seattle, WA. 243p.

Smith, J.M., Messmer, L.W., Phipps, J.B., Samuelson, D.F., and Schermer, E.D., 1980, Grays Harbor and Chehalis River improvements to navigation environmental studies - Grays Harbor ocean disposal study: literature review and preliminary benthic sampling: U.S. Army Corps of Engineers Internal Report.

Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19980828
Ending_Date: 19980916
Currentness_Reference: 1998
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -124.500000
East_Bounding_Coordinate: -123.080000
North_Bounding_Coordinate: +47.350000
South_Bounding_Coordinate: +45.900000
Keywords:
Theme:
Theme_Keyword_Thesaurus: General
Theme_Keyword: ArcView
Theme_Keyword: shapefile
Theme_Keyword: surficial geology
Theme_Keyword: sediment samples
Theme_Keyword: points
Theme_Keyword: CRLS98014
Place:
Place_Keyword_Thesaurus: General
Place_Keyword: Pacific Ocean
Place_Keyword: Washington
Place_Keyword: Oregon
Place_Keyword: WA
Place_Keyword: OR
Place_Keyword: Columbia River
Place_Keyword: Columbia River littoral cell
Place_Keyword: Inner shelf
Place_Keyword: Washington continental shelf
Place_Keyword: Washington coastal zone
Temporal:
Temporal_Keyword_Thesaurus: General
Temporal_Keyword: Modern
Access_Constraints: None
Use_Constraints:
The U.S. Geological Survey must be referenced as the originator of the dataset in any future products or research derived from these data.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: David C. Twichell
Contact_Organization: U.S. Geological Survey
Contact_Position: Oceanographer
Contact_Address:
Address_Type: mailing and physical address
Address:
U.S. Geological Survey
Woods Hole Field Center
384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: USA
Contact_Voice_Telephone: 508-548-8700
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: dtwichell@usgs.gov

Data_Quality_Information:
Logical_Consistency_Report:
Each sediment sample was analyzed using the same techniques, therefore highly consistent.
Completeness_Report:
All sediment samples acquired on the cruise CRLS98014 are presented in this dataset.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
These navigational points actually represent the ship's position. No instrumentation was on board to give the sediment sampler's position while on the seafloor. However, most of the samples were taken in fairly shallow water, therefore the potential for ship offset due to wire angle is minimized.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
Although depth measurements were taken with an Odem fathometer, the criteria for taking these measurements is not particularly strict.  A rough estimate of vertical accuracy is +/- 1 meter.
Lineage:
Process_Step:
Process_Description:
The sediment sample locations and associated sample identification were logged shipboard. Sediment analyses were performed in the USGS Woods Hole sediment lab. This analyses information was then joined to the sediment sample location in ArcInfo. The data were then converted to ArcView shapefiles.
Process_Date: 19980000
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: VeeAnn A. Cross
Contact_Organization: U.S. Geological Survey
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: mailing and physical address
Address:
U.S. Geological Survey
Woods Hole Field Center
384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov

Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Point

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.00018
Longitude_Resolution: 0.00026
Geographic_Coordinate_Units: Decimal degrees
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137.0
Denominator_of_Flattening_Ratio: 298.257222101
Vertical_Coordinate_System_Definition:
Depth_System_Definition:
Depth_Datum_Name: Local surface
Depth_Resolution: 2
Depth_Distance_Units: Meters
Depth_Encoding_Method: Attribute values

Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: grabsamp.dbf
Entity_Type_Definition: ArcView shapefile attribute table
Entity_Type_Definition_Source: ESRI
Attribute:
Attribute_Label: Long
Attribute_Definition:
Longitude coordinate of sample recorded in decimal degrees.
Attribute_Definition_Source: Data processor - VeeAnn A. Cross
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -124.3323
Range_Domain_Maximum: -123.9635
Unrepresentable_Domain: character set
Attribute_Units_of_Measure: Decimal degrees
Attribute:
Attribute_Label: Lat
Attribute_Definition:
Latitude coordinate of sample recorded in decimal degrees.
Attribute_Definition_Source: Data processor - VeeAnn A. Cross
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 46.0501
Range_Domain_Maximum: 47.1894
Attribute_Units_of_Measure: Decimal degrees
Attribute:
Attribute_Label: Samp_id
Attribute_Definition:
Sediment sample identification label assigned in the published literature.
Attribute_Definition_Source: Sample collector
Attribute_Domain_Values:
Unrepresentable_Domain: character field
Attribute:
Attribute_Label: Gravel
Attribute_Definition: Percentage of total sediment sample larger than or equal to -1 phi (>= 2.0 mm)
Attribute_Definition_Source: Based on the Udden-Wentworth sediment classification scale, with the phi scale devised by Krumbein.
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.00
Range_Domain_Maximum: 74.85
Attribute_Units_of_Measure: Percentage of total sample.
Attribute:
Attribute_Label: Sand
Attribute_Definition: Percentage of total sediment sample that falls in the range of less than -1 phi (2.0 mm) to 4.0 phi (62.5 Ám).
Attribute_Definition_Source: Based on the Udden-Wentworth sediment classification scale, with the phi scale devised by Krumbein.
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 15.09
Range_Domain_Maximum: 99.66
Attribute:
Attribute_Label: Silt
Attribute_Definition: Percentage of total sediment sample that falls in the range of less than 4 phi (62.5 Ám) to 8.0 phi (3.91 Ám).
Attribute_Definition_Source: Based on the Udden-Wentworth sediment classification scale, with the phi scale devised by Krumbein.
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.10
Range_Domain_Maximum: 73.36
Attribute:
Attribute_Label: Clay
Attribute_Definition: Percentage of total sediment sample less than 8 phi (3.91 Ám).
Attribute_Definition_Source: Based on the Udden-Wentworth sediment classification scale, with the phi scale devised by Krumbein.
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.02
Range_Domain_Maximum: 11.55
Attribute:
Attribute_Label: Siltclay
Attribute_Definition: Percentage of total sediment sample that falls in the silt plus clay fraction i.e. less than 4 phi (62.5 Ám).
Attribute_Definition_Source: User defined based on the Udden-Wentworth sediment classification scheme.
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.12
Range_Domain_Maximum: 84.91
Attribute:
Attribute_Label: Depth_m
Attribute_Definition: Distance from the sea surface to the sea floor where the sediment sample was taken - measured in meters.
Attribute_Definition_Source: User defined.
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: 73.00
Attribute_Units_of_Measure: meters
Attribute:
Attribute_Label: Class
Attribute_Definition:
gravel>10%--- any sample that has more than 10% gravel

sand---sample has > 75% sand but < 10% gravel

sandy_silt---sample has 50-75% silt, 20-50% sand, < 20% clay

silty_sand---sample has 50-75% sand, 20-50% silt, < 20% clay

no_sample--- no sediment sample was colletected, but this location is retained because either seafloor video or photos were taken.

Attribute_Definition_Source: User defined based on Udden-Wentworth and modified Shepard classification scheme.
Attribute_Domain_Values:
Unrepresentable_Domain: character field
Attribute:
Attribute_Label: Median
Attribute_Definition: Computed median phi of the sediment sample derived using method of moments statistics (Folk, 1974).
Attribute_Definition_Source: Computed - user defined.
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -2.21
Range_Domain_Maximum: 5.34
Attribute_Units_of_Measure: phi
Attribute:
Attribute_Label: Mean
Attribute_Definition: Computed mean phi of the sediment sample derived using method of moments statistics (Folk, 1974).
Attribute_Definition_Source: Computed - user defined.
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -1.97
Range_Domain_Maximum: 5.41
Attribute_Units_of_Measure: phi
Attribute:
Attribute_Label: Stddev
Attribute_Definition: Computed standard deviation of the sediment sample derived using method of moments statistics (Folk, 1974).
Attribute_Definition_Source: Computed - user defined.
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.24
Range_Domain_Maximum: 2.11
Attribute:
Attribute_Label: Skew
Attribute_Definition: Computed skewness of the sediment sample derived using method of moments statistics (Folk, 1974).
Attribute_Definition_Source: Computed - user defined.
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -1.64
Range_Domain_Maximum: 8.85
Attribute:
Attribute_Label: Kurt
Attribute_Definition: Computed kurtosis of the sediment sample derived using method of moments statistics (Folk, 1974).
Attribute_Definition_Source: Computed - user defined.
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -0.83
Range_Domain_Maximum: 364.37
Attribute:
Attribute_Label: Phi11
Attribute_Definition: Percentage of total sediment sample < 0.97 Ám
Attribute_Definition_Source: User defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.00
Range_Domain_Maximum: 1.56
Attribute:
Attribute_Label: Phi10
Attribute_Definition: Percentage of total sediment sample that falls in the range of 1.95 Ám > x > 0.97 Ám.
Attribute_Definition_Source: User defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.01
Range_Domain_Maximum: 4.14
Attribute:
Attribute_Label: Phi9
Attribute_Definition: Percentage of total sediment sample that falls in the range of 3.91 Ám >x > 1.95 Ám.
Attribute_Definition_Source: User defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.01
Range_Domain_Maximum: 5.85
Attribute:
Attribute_Label: Phi8
Attribute_Definition: Percentage of total sediment sample that falls in the range of 7.81Ám > x > 3.91 Ám.
Attribute_Definition_Source: User defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.01
Range_Domain_Maximum: 8.50
Attribute:
Attribute_Label: Phi7
Attribute_Definition: Percentage of total sediment sample that falls in the range of 15.63 Ám > x > 7.81 Ám.
Attribute_Definition_Source: User defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.02
Range_Domain_Maximum: 18.88
Attribute:
Attribute_Label: Phi6
Attribute_Definition: Percentage of total sediment sample that falls in the range of 31.25 Ám > x > 15.63 Ám.
Attribute_Definition_Source: User defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.03
Range_Domain_Maximum: 21.38
Attribute:
Attribute_Label: Phi5
Attribute_Definition: Percentage of total sediment sample that falls in the range of 62.5 Ám > x > 31.25 Ám.
Attribute_Definition_Source: User defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.04
Range_Domain_Maximum: 41.91
Attribute:
Attribute_Label: Phi4_00
Attribute_Definition: Percentage of total sediment sample that falls in the range of 74.3 Ám > x > 62.5 Ám.
Attribute_Definition_Source: User defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.03
Range_Domain_Maximum: 25.85
Attribute:
Attribute_Label: Phi3_75
Attribute_Definition: Percentage of total sediment sample that falls in the range of 88.4 Ám > x > 74.3 Ám.
Attribute_Definition_Source: User defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.03
Range_Domain_Maximum: 40.73
Attribute:
Attribute_Label: Phi3_50
Attribute_Definition: Percentage of total sediment sample that falls in the range of 105.1 Ám > x > 88.4 Ám.
Attribute_Definition_Source: User defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.02
Range_Domain_Maximum: 32.27
Attribute:
Attribute_Label: Phi3_25
Attribute_Definition: Percentage of total sediment sample that falls in the range of 125.0 Ám > x > 105.1 Ám.
Attribute_Definition_Source: User defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.05
Range_Domain_Maximum: 27.35
Attribute:
Attribute_Label: Phi3_00
Attribute_Definition: Percentage of total sediment sample that falls in the range of 148.7 Ám > x > 125.0 Ám.
Attribute_Definition_Source: User defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.16
Range_Domain_Maximum: 57.99
Attribute:
Attribute_Label: Phi2_75
Attribute_Definition: Percentage of total sediment sample that falls in the range of 176.8 Ám > x > 148.7 Ám.
Attribute_Definition_Source: User defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.35
Range_Domain_Maximum: 40.74
Attribute:
Attribute_Label: Phi2_50
Attribute_Definition: Percentage of total sediment sample that falls in the range of 210.2 Ám > x > 176.8 Ám.
Attribute_Definition_Source: User defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.22
Range_Domain_Maximum: 20.31
Attribute:
Attribute_Label: Phi2_25
Attribute_Definition: Percentage of total sediment sample that falls in the range of 250.0 Ám > x > 210.2 Ám.
Attribute_Definition_Source: User defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.07
Range_Domain_Maximum: 27.46
Attribute:
Attribute_Label: Phi2_00
Attribute_Definition: Percentage of total sediment sample that falls in the range of 297.3 Ám > x > 250.0 Ám.
Attribute_Definition_Source: User defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.05
Range_Domain_Maximum: 22.91
Attribute:
Attribute_Label: Phi1_75
Attribute_Definition: Percentage of total sediment sample that falls in the range of 353.6 Ám > x > 297.3 Ám.
Attribute_Definition_Source: User defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.01
Range_Domain_Maximum: 9.71
Attribute:
Attribute_Label: Phi1_50
Attribute_Definition: Percentage of total sediment sample that falls in the range of 420.4 Ám > x > 353.6 Ám.
Attribute_Definition_Source: User defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.01
Range_Domain_Maximum: 4.30
Attribute:
Attribute_Label: Phi1_25
Attribute_Definition: Percentage of total sediment sample that falls in the range of 500.0 Ám > x > 420.4 Ám.
Attribute_Definition_Source: User defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.01
Range_Domain_Maximum: 3.33
Attribute:
Attribute_Label: Phi1_00
Attribute_Definition: Percentage of total sediment sample that falls in the range of 594.6 Ám > x > 500.0 Ám.
Attribute_Definition_Source: User defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.01
Range_Domain_Maximum: 4.93
Attribute:
Attribute_Label: Phi0_75
Attribute_Definition: Percentage of total sediment sample that falls in the range of 707.1 Ám > x > 594.6 Ám.
Attribute_Definition_Source: User defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.00
Range_Domain_Maximum: 5.69
Attribute:
Attribute_Label: Phi0_50
Attribute_Definition: Percentage of total sediment sample that falls in the range of 840.9 Ám > x > 707.1 Ám.
Attribute_Definition_Source: User defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.00
Range_Domain_Maximum: 10.80
Attribute:
Attribute_Label: Phi0_25
Attribute_Definition: Percentage of total sediment sample that falls in the range of 1.0 mm > x > 840.9 Ám.
Attribute_Definition_Source: User defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.00
Range_Domain_Maximum: 11.11
Attribute:
Attribute_Label: Phi0_00
Attribute_Definition: Percentage of total sediment sample that falls in the range of 1.19 mm > x > 1 mm.
Attribute_Definition_Source: User defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.00
Range_Domain_Maximum: 12.60
Attribute:
Attribute_Label: Phi_0_25
Attribute_Definition: Percentage of total sediment sample that falls in the range of 1.41 mm > x > 1.19 mm.
Attribute_Definition_Source: User defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.00
Range_Domain_Maximum: 13.51
Attribute:
Attribute_Label: Phi_0_50
Attribute_Definition: Percentage of total sediment sample that falls in the range of 1.68 mm > x > 1.41 mm.
Attribute_Definition_Source: User defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.00
Range_Domain_Maximum: 10.33
Attribute:
Attribute_Label: Phi_0_75
Attribute_Definition: Percentage of total sediment sample that falls in the range of 2.0 mm > x > 1.68 mm.
Attribute_Definition_Source: User defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.00
Range_Domain_Maximum: 8.80
Attribute:
Attribute_Label: Phi_1_00
Attribute_Definition: Percentage of total sediment sample that falls in the range of 2.38 mm > x > 2.0 mm.
Attribute_Definition_Source: User defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.00
Range_Domain_Maximum: 4.41
Attribute:
Attribute_Label: Phi_1_25
Attribute_Definition: Percentage of total sediment sample that falls in the range of 2.83 mm > x > 2.38 mm.
Attribute_Definition_Source: User defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.00
Range_Domain_Maximum: 6.26
Attribute:
Attribute_Label: Phi_1_50
Attribute_Definition: Percentage of total sediment sample that falls in the range of 3.36 mm > x > 2.83 mm.
Attribute_Definition_Source: User defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.00
Range_Domain_Maximum: 5.19
Attribute:
Attribute_Label: Phi_1_75
Attribute_Definition: Percentage of total sediment sample that falls in the range of 4.0 mm > x > 3.36 mm.
Attribute_Definition_Source: User defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.00
Range_Domain_Maximum: 5.79
Attribute:
Attribute_Label: Phi_2_00
Attribute_Definition: Percentage of total sediment sample that falls in the range of 4.76 mm > x > 4.0 mm.
Attribute_Definition_Source: User defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.00
Range_Domain_Maximum: 4.09
Attribute:
Attribute_Label: Phi_2_25
Attribute_Definition: Percentage of total sediment sample that falls in the range of 5.66 mm > x > 4.76 mm.
Attribute_Definition_Source: User defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.00
Range_Domain_Maximum: 5.27
Attribute:
Attribute_Label: Phi_2_50
Attribute_Definition: Percentage of total sediment sample that falls in the range of 6.73 mm > x > 5.66 mm.
Attribute_Definition_Source: User defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.00
Range_Domain_Maximum: 6.57
Attribute:
Attribute_Label: Phi_2_75
Attribute_Definition: Percentage of total sediment sample that falls in the range of 8.0 mm > x > 6.73 mm.
Attribute_Definition_Source: User defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.00
Range_Domain_Maximum: 8.31
Attribute:
Attribute_Label: Phi_3_00
Attribute_Definition: Percentage of total sediment sample that falls in the range of 16.0 mm > x > 8.0 mm.
Attribute_Definition_Source: User defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.00
Range_Domain_Maximum: 24.10
Attribute:
Attribute_Label: Phi_4_00
Attribute_Definition: Percentage of total sediment sample is > 16.0 mm.
Attribute_Definition_Source: User defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.00
Range_Domain_Maximum: 7.69
Overview_Description:
Entity_and_Attribute_Overview:
In order to convert from phi to mm, the following equation can be used:  mm = 2-(phi)

PHI                      MM

11.00                0.000488281

10.00                0.000976563

9.00                  0.001953125

8.00                  0.00390625

7.00                  0.0078125

6.00                  0.015625

5.00                  0.03125

4.00                  0.0625

3.75                  0.074325445

3.50                  0.088388348

3.25                  0.105112052

3.00                  0.125

2.75                  0.148650889

2.50                  0.176776695

2.25                  0.210224104

2.00                  0.25

1.75                  0.297301779

1.50                  0.353553391

1.25                  0.420448208

1.00                  0.5

0.75                  0.594603558

0.50                  0.707106781

0.25                  0.840896415

0.00                  1.0

-0.25                 1.189207115

-0.50                 1.414213562

-0.75                 1.681792831

-1.00                 2.0

-1.25                 2.37841423

-1.50                 2.828427125

-1.75                 3.363585661

-2.00                 4.0

-2.25                 4.75682846

-2.50                 5.656854249

-2.75                 6.727171322

-3.00                 8.0

-4.00               16.0

A value of 9999 is reserved for a nodata value. If any attribute has a value of 9999, it indicates the particular attribute information is unavailable.

Entity_and_Attribute_Detail_Citation: Wentworth , C.K., 1929, Method of computing mechanical composition types in sediments: Geological Society of America Bulletin, v.40, p. 771-790.
Entity_and_Attribute_Detail_Citation: Krumbein, W.C., 1934, Size frequency distributions of sediments: Journal of Sedimentary Petrology, v. 4, p. 65-77.
Entity_and_Attribute_Detail_Citation: Shepard, F.P., 1954, Nomenclature based on sand-silt-clay ratios: Journal Sedimentary Petrology, v.24, p.151-158.
Entity_and_Attribute_Detail_Citation: Folk, R.L., 1974, The petrology of sedimentary rocks: Austin, Tex., Hemphill Publishing Co., 182 p.

Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Nancy Soderberg
Contact_Organization: U.S. Geological Survey
Contact_Position: Data Librarian
Contact_Address:
Address_Type: mailing and physical address
Address:
U.S. Geological Survey
Woods Hole Field Center
384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: USA
Contact_Voice_Telephone: 508-548-8700
Contact_Facsimile_Telephone: 508-457-2313
Contact_Electronic_Mail_Address: nsoderberg@usgs.gov
Resource_Description: U.S. Geological Survey CD-ROM Open-File Report
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Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
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Offline_Option:
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Recording_Format: ISO 9600 with Rock Ridge extensions
Compatibility_Information: UNIX, DOS, MAC
Fees: none at this time
Technical_Prerequisites:
This interpretation is available in ArcView shapefile format. The user must have ArcView, Arc Explorer, or another GIS package capable of importing and reading these data.

Metadata_Reference_Information:
Metadata_Date: 20000119
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: VeeAnn A. Cross
Contact_Organization: U.S. Geological Survey
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: mailing and physical address
Address:
U.S. Geological Survey
Woods Hole Field Center
384 Woods Hole Rd
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: USA
Contact_Voice_Telephone: 508-548-8700
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: 19940608

Generated by mp on Tue Jan 25 19:38:17 2000