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This data set depicts the geologic structures of the Sacramento Valley as mapped in USGS Professional Paper 1359, "Late Cenozoic Tectonism of the Sacramento Valley, California" (Harwood and Helley, 1987). The purpose of this dataset is to make the geologic data published in Harwood and Helley (1987) publicly available, for use in external mapping/GIS applications. The associated data are considered DWR enterprise GIS data, which meet all appropriate requirements of the DWR Spatial Data Standards, specifically the DWR Spatial Data Standard version 3.6, dated September 27, 2023. DWR makes no warranties or guarantees — either expressed or implied — as to the completeness, accuracy, or correctness of the data. DWR neither accepts nor assumes liability arising from or for any incorrect, incomplete, or misleading subject data.
Comments, problems, improvements, updates, or suggestions should be forwarded to GIS@water.ca.gov. |
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This data set depicts the geologic structures of the Sacramento Valley as mapped in USGS Professional Paper 1359, "Late Cenozoic Tectonism of the Sacramento Valley, California" (Harwood and Helley, 1987). The purpose of this dataset is to make the geologic data published in Harwood and Helley (1987) publicly available, for use in external mapping/GIS applications. The associated data are considered DWR enterprise GIS data, which meet all appropriate requirements of the DWR Spatial Data Standards, specifically the DWR Spatial Data Standard version 3.6, dated September 27, 2023. DWR makes no warranties or guarantees — either expressed or implied — as to the completeness, accuracy, or correctness of the data. DWR neither accepts nor assumes liability arising from or for any incorrect, incomplete, or misleading subject data.
Comments, problems, improvements, updates, or suggestions should be forwarded to GIS@water.ca.gov. |
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Department of Water Resources, Northern Region Office, Groundwater and Geological Investigations Section. Originator: Jonathan Mulder. Updates: Nate Cheshier
Harwood, D.S.and Helley, E.J., 1987. Late Cenozoic Tectonism of the Sacramento Valley, California: U.S. Geological Survey Professional Paper
1359, 53 p. |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This data set is a series of polylines denoting the major geologic structures of the Sacramento Valley as mapped in USGS Professional Paper 1359, "Late Cenozoic Tectonism of the Sacramento Valley, California" (Harwood and Helley,1987). This data set was created by scanning the original sheets from (Harwood and Helley, 1987), the sheets were georeferenced individually and the geologic information was digitized using AutoCAD 2006. The accuracy of the digitized lines was deemed to be within acceptable error tolerances, with the digitized lines accurately matching the original drafted lines. In general, the width of the contact lines on the paper copy, accounting for scale, ranged up to about 20 meters (66 feet). During the original digitization, minor topological mistakes (such as identical rock units on both sides of a lithologic contact or unclosed polygons) and omissions (such as unidentified lithologic units) were applied according to the best available knowledge. Comparisons were made between the original mylar and colorized field sheets (as available), in addition to the Geologic Map of the Battle Creek Fault Zone, Northern Sacramento Valley, California (USGS Map MF-1298, 1981), the Geologic Map of the Chico Monocline and Northeastern Part of the Sacramento Valley, California (USGS Miscellaneous Investigations Series Map I-1238, 1981), the Geologic Map of the Red Bluff 30' X 60' Quadrangle, California (USGS Geologic Investigation Series Map I-2542, 1995), and the Geologic Map of the Whitmore Quadrangle, California (Geologic Quadrangle Map GQ-993).</SPAN></P></DIV></DIV></DIV> |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 11 0;"><SPAN>The original source projection of the DWR GIS atlas dataset was Transverse Mercator, NAD83 UTM Zone 10. For copies of data in original projection, please contact DWR directly.</SPAN></P><P><SPAN>None. Reference should be made to the Department of Water Resources, Northern Region Office, Groundwater and Geological Investigations Section as the originator of this data.</SPAN></P></DIV></DIV></DIV> |
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i08_GeologicStructures_SacramentoValley |
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["Geology","Structural Geology","Harwood and Helley","United States Geological Survey","USGS","Department of Water Resources","DWR","Map","Geographic Information Systems","GIS","Tectonics","Deformation","Atlas","DWR GIS Atlas","Sacramento Valley","California"] |
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en-US |
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150000000 |
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