William S. Butcher
1951
Part I: Lithology of the offshore San Diego area; Part II: Foraminifera, Coronado Bank and vicinity, California
Paper
Los Angeles
University of California
PhD. dissertation. Parts included in Submarine Geology off San Diego, California, by K.O. Emery, W.S. Butcher, H.R. Gould, and F.P. Shepard, Journal of Geology v. 60, number 6, pp. 551-548.
"The lithology of the land and island areas adjacent to the San Diego area are reviewed briefly. The geology of Los Coronados Islands is presented in more detail than formerly and the importance of faulting is shown. A total of 418 rock samples collected in the offshore San Diego area have been examined and classified lithologically. The rocks have been subdivided into three classifications on the basis of rounding and composition: 1.) rocks essentially in place, 2) transported rocks, and 3) authigenic rocks. Charts of the 3 lithologic classifications are presented. The rocks essentially in place and the transported rocks occupy two belts: 1.) Coronado Bank - Coronado Escarpment and 2) Pt. Loma - Tia Juana River. Cretaceous rocks are exposed off Pt. Loma; and Late Pliocene to Pleistocene, on Coronado Bank. These may be correlatives of the 'Chico' and San Diego formations, respectively. The transported rocks are derived from distant sources for the most part, but a small portion is derived from the outcrop areas. The authigenic rock is phosphorite which is almost confined to Coronado Bank. The age of the formation of the major portion of the phosphorite is believed to be post-Late Pliocene and pre-last glacial. The physiography of the area is dominated by the Coronado Escarpment, a probable fault scarp. North of the Los Coronados Islands, Loma Sea Valley and Coronado Canyon mark other faults. Los Coronados Islands are probably tilted fault blocks."
The study of the lithology of the offshore San Diego area has been undertaken with the purpose of determining the areas of bedrock outcrops, their lithology, and the geologic age. A further purpose of this study is to determine, in so far as possible, the structure of the area. The transported rocks are studied to determine their composition and origin. The authigenic rock, phosphorite, is studied to determine the age and mode of formation in this area.
Funded by the Office of Naval Research (N6-ori-111, Task 6). Data digitized by the USGS for inclusion into usSEABED (http://walrus.wr.usgs.gov/usseabed)
1951
Publication date
None planned
-117.48333
-117.15500
32.74833
32.31833
None
University of California, Los Angeles
Grab
Dredge
ISO 19115 Topic Category
Oceans and Estuaries
Location
GeoscientificInformation
NASA/Global Change Master Directory (GCMD) Earth Science Keyword. Version 5.3.3
Marine Sediments
Sediment Composition
Sedimentary Structures
Terrigenous Sediments
Geographic Names Information System (GNIS)
California
San Diego
None
Los Coronados Island
Coronado Bank
Geologic
Cretaceous
Pleistocene
Late Pliocene
None. Report is available at libraries.
Cite William S. Butcher and UCLA as originator of the data.
University of California
Physical
Department of Earth and Space Sciences
595 Charles Young Drive East
Los Angeles
CA
90095-1567
310-825-2779
info@ess.ucla.edu
Butcher_PhD_51
Sample distribution with coastline and bathymetry for reference.
.jpg
William S. Butcher at the University of California, Los Angeles 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).
Tkme: Another editor for formal metadata by Peter N. Schweitzer (U.S. Geological Survey, Reston, VA 22092), version 2.9.13, Microsoft Windows Version 5.1; Microsoft Word 2000 9.0
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.
Data are consistent.
All data in Appendix A were digitized; Heavy mineral analyses (unlocated) and foraminiferal identification were not digitized.
Navigational technique not given in paper. Positions given to degrees minutes, tenths. Dredge samples have start and end positions; in usSEABED, point locations for dredged samples are taken at midpoints.
Depth determination technique not given in paper. Depths given in fathoms.
No information is given on the processing of the samples. Only simple descriptions are included in the report.
Unknown
Butcher_PhD_1951
University of California
Physical
Department of Earth and Space Sciences
595 Charles Young Drive East
Los Angeles
CA
90095-1567
310-825-2779
info@ess.ucla.edu
Vector
Entity point
418
0.03167
0.05500
Decimal degrees
Point
SDTS point
Source report
Sample number
Sample number
Source report
Alpha numeric code
Water depth
Water depth
Source report
506
1570
Meters
1.0
Lithologic description
Sample descriptions
Source report
Written text including shape, number of specimens, maximum size (in centimeters), and lithology.
University of California
Physical
Department of Earth and Space Sciences
595 Charles Young Drive East
Los Angeles
CA
90095-1567
310-825-2779
info@ess.ucla.edu
Butcher PhD 1951.
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.
Report is available at libraries.
None
None
1945
2005
U.S. Geological Survey
Jane A. Reid
Geologist
Physical and mail
400 Natural Bridges Drive
Santa Cruz
CA
95060
831-427-4727
jareid@usgs.gov
Email preferred
CSDGM Version 2
FGDC-STD-001-1998
None
Metadata was written by a user of the data. Any information contained in the physical report is authoritative and supercedes any information given here.