Identification_Information: Citation: Citation_Information: Originator: Herbert Palfrey Colomb, Jr. Publication_Date: 1973 Title: Recent marine sediments of the central California continental shelf between Point Lobos and Point Sur Geospatial_Data_Presentation_Form: Paper Publication_Information: Publication_Place: Monterey, CA Publisher: United States Naval Postgraduate School Other_Citation_Details: Partial funding through the Office of Naval Research Description: Abstract: "Seventy sediment samples were collected from the continental shelf between Pt. Lobos and Pt. Sur for textural analysis to determine their statistical properties. Based upon the parameters of mean grain-size, standard deviation, and skewness, three distinct belts of sediments were found. Along the coast the sediments were composed of medium sand-sized, moderately to well sorted particles. Down the center of the shelf a discontinuous band of fine sand occurs in the depths of 35 to 65 fm. The outer band appears to follow the break in the continental shelf and is composed of relatively coarse sediment. Two bathymetric and 3.5 kHz seismic profiling cruises were made through the area. The results of these cruises indicate that the offshore extension of the Palo Colorado fault follows a branch of the Carmel submarine canyon. The primary source of sediments appears to be weathering of coastal rock formations, with sediment distribution due to wave action." Purpose: "The objective of this study was to describe and explain the distribution of the recent sediments along the central California continental shelf between Point Lobos and Point Sur, California." Supplemental_Information: Data digitized by the USGS for inclusion into usSEABED (http://walrus.wr.usgs.gov/usseabed) Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1971 Currentness_Reference: Publication date Status: Progress: Complete Maintenance_and_Update_Frequency: None Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -122.0600 East_Bounding_Coordinate: -121.9100 North_Bounding_Coordinate: 36.5242 South_Bounding_Coordinate: 36.2717 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: U.S. Navy Theme_Keyword: Postgraduate School Theme_Keyword: NPS Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: Oceans and Estuaries Theme_Keyword: Location Theme_Keyword: GeoscientificInformation Theme: Theme_Keyword_Thesaurus: NASA/Global Change Master Directory (GCMD) Earth Science Keyword. Version 5.3.3 Theme_Keyword: Marine Sediments Theme_Keyword: Sediment Composition Theme_Keyword: Sedimentary Structures Theme_Keyword: Sedimentary Textures Theme_Keyword: Terrigenous Sediments Place: Place_Keyword_Thesaurus: Geographic Names Information System (GNIS) Place_Keyword: California Place_Keyword: Point Lobos Place_Keyword: Point Sur Place: Place_Keyword_Thesaurus: None Place_Keyword: Continental shelf Access_Constraints: Available at the USGS library and other libraries Use_Constraints: Cite Herbert Palfrey Colomb, Jr. and the U.S. Naval Postgraduate School as the originators of the data. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Naval Postgraduate School Contact_Address: Address_Type: Physical Address: 1 University Circle City: Monterey State_or_Province: CA Postal_Code: 93943 Contact_Voice_Telephone: 831.656.2441 Browse_Graphic: Browse_Graphic_File_Name: Colomb_MS_1973 Browse_Graphic_File_Description: Screen grab of GIS-produced sample distribution, with bathymetry and land for reference. Browse_Graphic_File_Type: JPG Data_Set_Credit: Herbert P. Colomb Jr at the United States Naval Postgraduate School for the collection and analysis of data. For inclusion into usSEABED: Digitization: Jane Reid (USGS); Formatting corrections: Jane Reid (USGS) and Chris Jenkins (University of Colorado) Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: No estimate made for the accuracy of the data in the original report. Data digitized by the USGS and partners were visually compared to the source data, and corrected. Where appropriate, data were tested for completeness using MS Excel. Locations checked using GIS. Logical_Consistency_Report: Data fall within normal ranges for sediment statistics. Completeness_Report: Digitized data include table 2 and some information in the text. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Navigation technique not noted in report. Locations given to nearest hundredth of a decimal minute. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Water depths measured by fathometer; water depths given to nearest fathom. No accuracy estimations noted in report. Lineage: Process_Step: Process_Description: Grain-size analyses were conducted in accordance with the procedures outline in Krumbein and Pettijohn (1938). Grab samples were split to obtain a representative subsample of about 250 to 300 g. The subsample was then wet-sieved through a 4.0 phi screen to separate the sand and gravel-size fractions from the silt and clay-size fractions...." The dried coarse fraction was sieved at 0.5 phi intervals in a Ro-tap for 10 minutes, and weighed to the nearest 0.1 mg. Fine fraction (< 4.0 phi) were pipetted at 0.5 interval, except those samples which contained less than 5% of the total sample weight were dried and weighed directly. Statistics were computed using a program written by W. R. Anikouchine (Dinger, 1970), including Trask, Inman, and Folk and Ward values as modified by Carter, 1971. Source_Used_Citation_Abbreviation: Krumbein and Pettijohn, 1938 Source_Used_Citation_Abbreviation: Dinger, 1970 Process_Date: 1971 Source_Produced_Citation_Abbreviation: Colomb_MS_1973 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Naval Postgraduate School Contact_Address: Address_Type: Physical Address: 1 University Circle City: Monterey State_or_Province: CA Postal_Code: 93943 Contact_Voice_Telephone: 831.656.2441 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Point Point_and_Vector_Object_Count: 66 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.00017 Longitude_Resolution: 0.00017 Geographic_Coordinate_Units: Decimal degrees Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: Point Entity_Type_Definition: SDTS point Entity_Type_Definition_Source: Source report Attribute: Attribute_Label: Depth Attribute_Definition: Water depth of sample Attribute_Definition_Source: Colomb, 1973 Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 36 Range_Domain_Maximum: 210 Attribute_Units_of_Measure: Meters Attribute_Measurement_Resolution: 1.0 Attribute: Attribute_Label: Gravel Attribute_Definition: Gravel Attribute_Definition_Source: Krumbein and Pettijohn, 1938 Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 74.4 Attribute_Units_of_Measure: Percent Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: Sand Attribute_Definition: Sand Attribute_Definition_Source: Krumbein and Pettijohn, 1938 Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 20.53 Range_Domain_Maximum: 99.46 Attribute_Units_of_Measure: Percent Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: Silt Attribute_Definition: Silt Attribute_Definition_Source: Krumbein and Pettijohn, 1938 Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.23 Range_Domain_Maximum: 15.41 Attribute_Units_of_Measure: Percent Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: Mean Attribute_Definition: Mean of grainsize distributions Attribute_Definition_Source: Folk and Ward, 1957 Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -1.69 Range_Domain_Maximum: 3.53 Attribute_Units_of_Measure: Phi Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: Dev. Attribute_Definition: Standard deviation of grainsize distribution (sorting) Attribute_Definition_Source: Folk and Ward, 1957 Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -0.67 Range_Domain_Maximum: 0.56 Attribute_Units_of_Measure: Phi Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: Skew. Attribute_Definition: Skewness of grainsize distribution Attribute_Definition_Source: Folk and Ward, 1957 Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.33 Range_Domain_Maximum: 3.69 Attribute_Units_of_Measure: Unitless Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: Text Attribute_Definition: Descriptive text Attribute_Definition_Source: Source report Attribute_Domain_Values: Unrepresentable_Domain: Text about the identification of gravel clasts. Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Naval Postgraduate School Contact_Address: Address_Type: Physical Address: 1 University Circle City: Monterey State_or_Province: CA Postal_Code: 93943 Contact_Voice_Telephone: 831.656.2441 Resource_Description: H.P. Colomb, Jr. Masters thesis, 1971 Distribution_Liability: Although this dataset has been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data. Users of the data should be aware of limitations of the data due to possible imprecision due to navigational inaccuracies and limitations of the statistical data. Standard_Order_Process: Non-digital_Form: Report is available at some libraries. Fees: None Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: Mail and physical Address: 345 Middlefield Road City: Menlo Park State_or_Province: CA Postal_Code: 94025 Contact_Voice_Telephone: 650.329.5026 Contact_Electronic_Mail_Address: men_lib@usgs.gov Resource_Description: 536 (276) C714r Distribution_Liability: Although this dataset has been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data. Users of the data should be aware of the limitations of the data due to possible imprecision due to navigational inaccuracies, statistical limitations, and digitizing errors. Standard_Order_Process: Non-digital_Form: Report is available for viewing or checkout at the USGS library, Menlo Park, and at other libraries. Fees: None Technical_Prerequisites: None Available_Time_Period: Time_Period_Information: Single_Date/Time: Calendar_Date: 1973 Metadata_Reference_Information: Metadata_Date: 2005 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Jane A. Reid Contact_Position: Geologist Contact_Address: Address_Type: Physical and mail Address: 400 Natural Bridges Drive City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Contact_Voice_Telephone: 831-427-4727 Contact_Electronic_Mail_Address: jareid@usgs.gov Contact_Instructions: Email preferred Metadata_Standard_Name: CSDGM Version 2 Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Access_Constraints: None Metadata_Use_Constraints: Metadata was written by a user of the data. Any information contained in the physical report is authoritative and supercedes any information given here.