Wong, Florence L. , 1995, Sediment distribution on a stream-dominated continental margin, Northern California; Implications from heavy-mineral studies: Open-file report 95-614, U.S. Geological Survey, Menlo Park, 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 0.0001. Longitudes are given to the nearest 0.0001. Latitude and longitude values are specified in Decimal degrees.
Alpha numeric number based on cruise and core information
|Range of values|
Percentages of actinolite, apatite, augite, basaltic hornblende, blue-green amphibole, brown hornblende, colorless clinopyroxene, enstatite, epidote, garnet, glaucophane, green hornblende, heavy minerals , hypersthene, lawsonite, opaque minerals, other minerals, rock fragments, spinel, termolite, tourmaline, unknown minerals, and zircon
Michael E. Field, Samuel H. Clarke, Jr. and Michael E. White at the USGS for collection of samples and Florence Wong for the analysis of data. For usSEABED, formatting: Jane Reid (USGS); Formatting corrections: Jane Reid (USGS) and Chris Jenkins (University of Colorado)
"The purpose of this study is to use heavy minerals to distinguish the river sources off northern California, to refine the dispersal pattern previously identified for Klamath sediment, and to determine the contribution of the Eel River to the shelf and slope sediments."
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.
From OFR 80-1080: "Positioning data were obtained at sea using satellite navigation and Loran C systems, and a shipborne electronic ranging system employing shore- based transponders. Radar was used infrequently for positioning where terrain masking or equipment malfunctions were encountered. Data from the satellite and Loran C systems were integrated by means of a Dead Reckoning computer (DRC). Positions derived from the DRC and electronic ranging systems initially were plotted separately and weighted according to their relative accuracy; subsequently these data were corrected and merged to produce maps of position location for geophysical tracklines and sampling stations. Estimated position accuracy ranges from + 50 m where positions were determined principally by electronic ranging (approximately 90 percent of the cruise) to an average of about + 500 m where DRC or radar positions were used exclusively (approximately 10 percent of the cruise). Positions given to 0.0001 decimal degrees."
Precision bathymetric and shallow subbottom records were obtained using 12 kHz and 3.5 kHz profiling systems employing hull-mounted transducers and hydrophones. Subsample depths given as nearest centimeter.
No estimate made for original data. For inclusion into usSEABED, all data in the report were included.
Data fall within normal ranges for the given parameters.
Are there legal restrictions on access or use of the data?
- None. Paper copy of report is available through the USGS, and is also available online.
- Cite Florence Wong and the U.S. Geological Survey as the originators of the data.
Open file report 95-614
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 through the USGS; scanned images are also available online at: <http://pubs.er.usgs.gov/pubs/ofr/ofr95614>
Plug-in not required, but best viewed with downloadable program DjVu at <http://www.lizardtech.com/download/dl_options.php?page=plugins>