Carbon 14 dates and locations, Columbia River Littoral Cell, WA/OR, USA

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Metadata:
Identification_Information:
Citation:
Citation_Information:
Originator: Portland State University, Department of Geology
Publication_Date: Unpublished material
Title:
Carbon 14 dates and locations, Columbia River Littoral Cell, WA/OR, USA
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: Portland, OR, USA
Publisher: Portland State University
Other_Citation_Details:
Curt Peterson (1), David Percy (1) 1) Department of Geology, Portland State University, Portland, OR, 97201 Major support for this project comes from the Southwest Washington Coastal Erosion Study-US Geological Survey (USGS). Further support comes from Portland State University.
Online_Linkage: nwdata.geol.pdx.edu
Description:
Abstract:
Radiocarbon dating of shoreface deposits, e.g., wood, shell and peat materials, has been performed for various sedimentology, archaeology, and paleotsunami investigations in the study area. The radiocarbon dates range from about 5 ka, establishing the onset of beach progradation at the preserved backedge of the Long Beach subcell, to historical time in modern beaches along the broad barriers and beach plains. Caution should be used in interpreting the beach-plain radiocarbon dates, as outlined below. Beach deposits can include older shell and wood materials that are reworked and re-deposited during shoreface retreat events. For example the reworking of an existing foredune-ridge paleosol by a catastrophic beach retreat event could incorporate 'old' wood or charcoal into the younger beach-scarp deposit. On the other hand interdune-valley pond and peat deposits develop well after shoreline progradation. For example, a net 1-3 m rise in sea-level required to flood the interdune-valleys after beach progradation should occur on millennium time scales, i.e., about one meter sea-level rise per 1,000 years in late-Holocene time. Therefore, basal peat deposits in the interdune-valleys likely post-date the shoreline progradation by one or more millennia. As a final example of age bias the C14-dated archaeological sites on foredune-ridges are assumed to post-date shoreline progradation. The cultural sites were likely located landward of active foredunes, i.e., in forested dune-ridges. Such locations would have reduced the occupants' exposure to onshore wind, blowing sand, and winter rain. In summary, the radiocarbon dating of beach plain samples yields limiting dates of shoreline positions that are useful for long-term (millennium) periods of net progradation. Higher-resolution shoreline mapping requires other proxies that represent geologically instantaneous events throughout the littoral cell.
Purpose:
The primary purpose of this work is to determine the age of materials and use them in a geological context.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19980601
Ending_Date: 20020415
Currentness_Reference: Publication Date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -124.3
East_Bounding_Coordinate: -123.890000
North_Bounding_Coordinate: +47.3
South_Bounding_Coordinate: +46.000000
Keywords:
Theme:
Theme_Keyword_Thesaurus: Tri - Service Spatial Data Standard
Theme_Keyword: Geology
Theme_Keyword: Coastal Deposition
Theme_Keyword: foredune ridge
Theme_Keyword: radiocarbon date
Theme_Keyword: c14
Theme_Keyword: carbon 14
Place:
Place_Keyword_Thesaurus: Geographic Names Information System
Place_Keyword: Washington
Place_Keyword: Oregon
Temporal:
Temporal_Keyword_Thesaurus: None
Temporal_Keyword: 5000ka
Temporal_Keyword: 5000bc
Access_Constraints: None
Use_Constraints:
The authors require that they be informed of any use of this data. An email to the contact person is appropriate for this purpose, a response should be received before proceeding.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: David Percy
Contact_Organization: Portland State University, Dept of Geology
Contact_Position: GIS Manager
Contact_Address:
Address_Type: mailing and physical address
Address:
Portland State University Department of Geology Room 17 Cramer Hall 1721 SW Broadway
City: Portland
State_or_Province: OR
Postal_Code: 97201
Country: USA
Contact_Voice_Telephone: 503-725-3373
Contact_Facsimile_Telephone: 503-725-3025
Contact_Electronic_Mail_Address: percyd@pdx.edu
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Most C14 attribute fields (setting, material type) are not uniquely defined. Age field and st dev are received from the reporting lab.
Logical_Consistency_Report:
All data sets within this report are logically consistent, particularly in regard to the temporal domain. That is, dunerige timelines do not cross scarp timelines. Care must be taken with the C14 interpretations.
Completeness_Report:
Data is complete at this level of detail. Further work could reveal more detail.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Location accuracy ranges from consumer grade GPS (+/- 5meters) to field note level (1/4 section).
Lineage:
Process_Step:
Process_Description:
Location data is retrieved from individual investigators in various coordinate systems and converted using ESRI projection tools to a common projection. Table is manually updated with age report from lab.
Process_Date: Unknown
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
VPF_Terms_Description:
VPF_Topology_Level: 0
VPF_Point_and_Vector_Object_Information:
VPF_Point_and_Vector_Object_Type: Node
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: Lambert Conformal Conic
Lambert_Conformal_Conic:
Standard_Parallel: 45.8333333333
Standard_Parallel: 47.3333333333
Longitude_of_Central_Meridian: -120.500000
Latitude_of_Projection_Origin: +45.333333
False_Easting: 500000
False_Northing: 0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 3
Ordinate_Resolution: 5
Planar_Distance_Units: Meters
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
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: C14 location and date
Entity_Type_Definition: Point
Entity_Type_Definition_Source: GIS
Attribute:
Attribute_Label: site_id
Attribute_Definition: unique site identifier, from different studies
Attribute_Definition_Source: various researchers
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: a
Range_Domain_Maximum: z
Attribute:
Attribute_Label: crlc_id
Attribute_Definition: internal unique identifier
Attribute_Definition_Source: internally defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: crlc001
Range_Domain_Maximum: crlc100
Attribute:
Attribute_Label: UTM_n
Attribute_Definition: UTM Northing Coordinate - Nad 83 zone 10
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: 10,000,000
Attribute_Units_of_Measure: meters
Attribute:
Attribute_Label: UTM_E
Attribute_Definition: UTM Easting Coordinate - Nad 83 zone 10
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: 10,000
Attribute_Units_of_Measure: meters
Attribute:
Attribute_Label: lab_num
Attribute_Definition: Lab that processed the sample
Attribute_Definition_Source: self
Attribute_Domain_Values:
Unrepresentable_Domain: varies
Attribute:
Attribute_Label: C14_age
Attribute_Definition: Corrected age, based on ratio of carbon isotopes
Attribute_Definition_Source: science!
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: 40,000
Attribute_Units_of_Measure: radiocarbon years
Attribute:
Attribute_Label: St_dev
Attribute_Definition: Standard deviation of age date, uncertainty.
Attribute_Definition_Source: statistics!
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1
Range_Domain_Maximum: 10,000
Attribute:
Attribute_Label: material
Attribute_Definition: Desription of material dated.
Attribute_Definition_Source: internally.
Attribute_Domain_Values:
Unrepresentable_Domain: varies
Attribute:
Attribute_Label: subsurface
Attribute_Definition: Depth below surface that sample was collected from
Attribute_Definition_Source: length measure.
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: 10
Attribute_Units_of_Measure: meters
Attribute:
Attribute_Label: setting
Attribute_Definition: geomorphic setting of collected sample.
Attribute_Definition_Source: coastal geomorphology.
Attribute_Domain_Values:
Unrepresentable_Domain: varies
Attribute:
Attribute_Label: source
Attribute_Definition: original publication this C14 date appears in.
Attribute_Definition_Source: published data sets
Attribute_Domain_Values:
Unrepresentable_Domain: varies
Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: David Percy
Contact_Address:
Address_Type: mailing and physical address
Address:
Portland State University Department of Geology Room 17 Cramer Hall 1721 SW Broadway
City: Portland
State_or_Province: OR
Postal_Code: 97201
Contact_Voice_Telephone: 503-725-3373
Contact_Facsimile_Telephone: 503-725-3025
Distribution_Liability:
This Compact Disc-Read Only Memory (CD-ROM) publication was prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, make any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitude or imply its endorsement, recommendation, or favoring by the United States Governemnt or any agency thereof. Any views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. Although all data published on this CD-ROM have been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and related materials and/or the functioning of the software. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of this data, software, or related materials.
Metadata_Reference_Information:
Metadata_Date: 20010809
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: David Percy
Contact_Organization: Portland State University Department of Geology
Contact_Position: GIS Manager
Contact_Address:
Address_Type: mailing and physical address
Address:
Portland State University Department of Geology Room 17 Cramer Hall 1721 SW Broadway
City: Portland
State_or_Province: OR
Postal_Code: 97201
Country: USA
Contact_Voice_Telephone: 503-725-3373
Contact_Electronic_Mail_Address: percyd@pdx.edu
Metadata_Standard_Name:
Content Standard for Digital Geospatial Metadata ("CSDGM version 2")
Metadata_Standard_Version: FGDC-STD-001-1998

Generated by mp version 2.7.9 on Thu May 16 14:10:08 2002