Schatz, Byron, 1963, A restudy of bottom sediments near the entrance of the Golden Gate: Hydraulic Engineering Laboratory Technical Report HEL 4-3, University of California, Berkeley, CA.
This is a Vector data set. It contains the following vector data types (SDTS terminology):
Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest .0001. Longitudes are given to the nearest .0001. Latitude and longitude values are specified in Decimal degrees.
| Range of values | |
|---|---|
| Minimum: | 20 |
| Maximum: | 670 |
| Units: | Microns |
| Resolution: | 1.0 |
| Range of values | |
|---|---|
| Minimum: | 1 |
| Maximum: | 61 |
| Units: | Percent |
| Resolution: | 1.0 |
Byron Scatz at the University of California at Berkeley for the collection and analysis of data. For inclusion into usSEABED: Digitization: Jennifer Mendonca (USGS, data) and Nadine Golden (USGS, locations); Formatting corrections: Jane Reid (USGS) and Chris Jenkins (University of Colorado)
510-642-3261 (voice)
"A restudy of the selected offshore samples was initiated in order to determine the existence of zones of heavy minerals or 'pay streaks' of heavy mineral accumulation and their relation to median grain diameters of bottom surface sediments."
Person who carried out this activity:
510-642-3261 (voice)
Trask, P.D., 1954, San Francisco Bay sediment study: University of California Institute of Engineering Research 57, issues 1 and 2, University of California, Berkeley, CA.
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.
Navigational technique not stated, although some samples may have been gathered by Navy divers. Locations were digitized in ArcMap 8.3 using a scanned copy of the figure 1.
All data were digitized unless locations or values could not be resolved during digitization. Percents of heavy minerals in the 74 to 177 micron size range was digitized from figure 5. Not digitized were the percent of bottom samples in the 77 to 147 micron size range and the percent of bottom samples in the 105 to 61 micron size range (figures 3 and 4, respectively)
Data fall within normal ranges for median grain size values.
Are there legal restrictions on access or use of the data?
- Access_Constraints: Available at the USGS library and others
- Use_Constraints:
- Cite Byron Schatz and the University of California, Berkeley as the source of the information
510-642-3261 (voice)
HEL Report 2-4
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.
Report is available at libraries.
650.329.5026 (voice)
men_lib@usgs.gov
S(276) UN39hel no. 4-3
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.
Report is available for viewing or checkout at the USGS library, Menlo Park, and at other libraries.
None
831-427-4727 (voice)
jareid@usgs.gov