Title: Geologic Structures, Elk River Watershed, California, 1940-2000
- Point data
- 2005
- Not owned by MIT (Owned by Stanford)
Dates
- Issued: 2005
- Coverage: 2005
Publishers
- California Geological Survey
Summary
This point shapefile represents geologic structures, such as quarries and bedding, within the Elk River watershed in Humboldt County, California. This dataset is the product of the Department of Conservation, California Geological Survey’s (CGS) investigation of landslides in the Elk River watershed. The 52 square mile study area is located in Humboldt County in northwestern California. The investigation was based on interpretation of 1940, 1941, 1948, 1954, 1962, 1965, 1984, 1988, 1996 and 2000 aerial photos, findings from CGS’s landslide mapping conducted in the early 1980s (Kilbourne, R.T. 1982-84, Manson, M. W. 1984), as well as other sources. Mapping was conducted at 1:24,000 scale. The resulting maps are titled “Geologic and Geomorphic Features Related to Landsliding, Elk River Watershed” (Plate 1) and “Relative Landslide Potential with Geologic and Geomorphic Features, Elk River Watershed” map (Plate 2). This study was conducted at a regional scale of mapping using ten sets of aerial photos combined with a compilation of earlier published and unpublished work. Other photo sets may reveal additional landslides. The regional nature of the study makes the data and maps, including the relative landslide potential zones, inappropriate as a substitute for site-specific analysis. CGS evaluated the geology, relative slope stability and geomorphic characteristics within the watershed, and compiled the digital geospatial data described in this document. This mapping and compilation is geared toward providing baseline geologic and geomorphic data to aid in responsible land management, as well as the development of watershed restoration projects, watershed management strategies, and watershed plans. Initial checking of attributes was conducted by the geologists who mapped the features. Limited field assessment of attributes was completed. The 'confidence' attribute indicates the geologist's level of certainty in a given feature (typically as viewed through a stereoscope). Peer reviewers and GIS staff conducted additional quality control. Because the attribute fields are designed to address various types of mapping products, and because some data is compiled from other sources, not all attribute fields are populated. Marshall, G., Mendes, E., California Geological Survey and California Dept. of Conservation. (2005). Geologic Structures, Elk River Watershed, California, 1940-2000 California Geological Survey. Available at: http://purl.stanford.edu/rm725tv4032. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.
Subjects
- Geology
- California, Northern
- Humboldt County (Calif.)
- Watersheds
- Quarries and quarrying
- Geoscientific Information
- Datasets
Geospatial coordinates
- Bounding Box: BBOX (-124.201346, -123.981886, 40.745432, 40.667695)
- Geometry: BBOX (-124.201346, -123.981886, 40.745432, 40.667695)
Provider
Stanford
Rights
- Access rights: Public
Citation
Marshall, Gerald, Mendes, Eric, California Geological Survey, California. Department of Conservation. Geologic Structures, Elk River Watershed, California, 1940-2000. California Geological Survey. Point data. https://purl.stanford.edu/rm725tv4032
Format
Shapefile
Languages
- English