Geologic Map of the southern White Ledge Peak and Matilija 7.5’ quadrangles, Santa Barbara and Ventura Counties, California by Scott A. Minor and Theodore R. Brandt 2015 Scientific Investigations Map 3321 ABSTRACT: This report presents a digital geologic strip map of the southern parts of the contiguous White Ledge Peak and Matilija 7.5’ quadrangles in coastal southern California. With a compilation scale of 1:24,000 (one inch on the map to 2,000 feet on the ground), the map depicts the distribution of bedrock units, surficial deposits, and associated deformation adjacent to and south of the Arroyo Parida fault and in the southern Ojai Valley east of the Ventura River. This new compilation, combined with a recently published geologic map of the Santa Barbara coastal plain (U.S. Geological Survey Scientific Investigations Map 3001), completes a 69-km-long east-west mapping transect from Goleta to Ojai by the U.S. Geological Survey. These two contiguous geologic maps provide new insights and constraints on Neogene-through-Quaternary tectonic deformation and consequent landscape change, including geohazards in the urbanized southern flank of the Santa Ynez Mountains. A principal aim of the new mapping and associated fault-kinematic measurements is to document and constrain the nature of transpressional strain transfer between various regional, potentially seismogenic faults. In the accompanying pamphlet, surficial and bedrock map units are described in detail as well as a summary of the structural and fault- kinematic framework of the map area. New biostratigraphic and biochronologic data based on microfossil identifications are presented in expanded unit descriptions of the marine Neogene Monterey and Sisquoc Formations. Site-specific fault-kinematic observations are embedded in the digital map database. This compilation provides a uniform geologic digital geodatabase and map plot files that can be used for visualization, analysis, and interpretation of the area’s geology, geologic hazards, and natural resources. DISCLAIMERS: This database, identified as SIM3321, has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use. Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty, expressed or implied is made regarding the display or utility of the data on any other system, or for general or scientific purposes, nor shall the act of distribution constitute such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and/or contained herein. Any use of trade, product or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Geological Survey. Although this information product, for the most part, is in the public domain, it also contains copyrighted material as noted in the text. Permission to reproduce copyrighted items for other than personal use must be secured from the copyright owner. DATA FILES: The database can be downloaded via the Web from http://dx.doi.org/10.3133/sim3321/. ArcInfo export files, ArcView shapefiles, and an ArcGIS geodatabase may be extracted from a zip-compressed file (sim3321_GIS.zip). In addition, an Adobe Portable Document Format (PDF) file (sim3321 _map.pdf, or sim3321_map_hillshade) can be downloaded, from which paper copies may be printed. The database contact is: Theodore R. Brandt 303-236-1901 tbrandt@usgs.gov U.S. Geological Survey Box 25046, Mail Stop 980 Denver, CO 80225 The data were compiled from field mapping and interpretation of color infrared aerial photographs. David J. Lidke (U.S. Geological Survey), and Larry D. Gurrola (Professional Geologist) reviewed the geologic map and accompanying text. This geospatial database consists of ArcInfo export files (.e00), ArcView shapefiles, and ArcGIS geodatabase files contained in a zip archive. See the list below. Please refer to the file sim3321.met for detailed metadata documentation for this geospatial database. List of files: 00ReadMe.txt sim3321_pamphlet.pdf sim3321_map.pdf sim3321_map_geo.pdf (georeferenced pdf for users' convenience; no hillshade included) sim3321.met wlmabasr.tif wlmabasr.tfw wlmahlsd.tif wlmahlsd.tfw sim3321_GIS.zip: e00 directory: wlmageo.e00 wlmafold.e00 wlmapnt.e00 wlmampnt.e00 wlmaslip.e00 wlmamslip.e00 wlmadec.e00 wlmahlsd.e00 wpgcmykg.shd.e00 geol_sfo.lin.e00 geoscamp2.mrk.e00 import.aml shapefiles directory: wlmageo.shp (.dbf/.prj/.sbn/.sbx/.shx.xml/.shx) polygon wlmageol.shp (.dbf/.prj/.sbn/.sbx/.shx.xml/.shx) line wlmafold.shp (.dbf/.prj/.sbn/.sbx/.shx.xml/.shx) line wlmapnt.shp (.dbf/.prj/.sbn/.sbx/.shx.xml/.shx) point wlmampnt.shp (.dbf/.prj/.sbn/.sbx/.shx.xml/.shx) point wlmaslip.shp (.dbf/.prj/.sbn/.sbx/.shx.xml/.shx) point wlmamslip.shp (.dbf/.prj/.sbn/.sbx/.shx.xml/.shx) point wlmadec.shp (.dbf/.prj/.sbn/.sbx/.shx.xml/.shx) point sim3321_gdb.zip directory (contains GIS data as geodatabase feature classes) HOW TO OBTAIN THE DIGITAL FILES: The digital files constituting the geologic map database of this report can be obtained via the Internet from the U.S. Geological Survey publications website. Go to the web page at http://dx.doi.org/10.3133/sim3321 and follow the directions to download the files. The main product is a Portable Document Format (.pdf) map, which requires Adobe Acrobat for viewing. Acrobat software runs on a variety of systems, and is available for download free of charge from Adobe at http://www.adobe.com.