Jeff W. Beeson Samuel Y. Johnson Susan A. Cochran 2019 GeoTIFF Data Series DS 781 Reston, VA U.S. Geological Survey https://doi.org/10.5066/P9PNNI9H https://www.sciencebase.gov/catalog/item/5d12884de4b0941bde56eb59 Nadine E. Golden 2013 database Data Series DS 781 Reston, VA U.S. Geological Survey https://pubs.usgs.gov/ds/781/ https://cmgds.marine.usgs.gov/data/csmp/PuntaGordaToPointArena/data_catalog_PuntaGordaToPointArena.html This part of DS 781 presents data for the depth-to-transition map of the Punta Gorda to Point Arena, California, region. The raster data file is included in the "DepthToTransition_PuntaGordaToPointArena.zip," which is accessible from https://doi.org/10.5066/P9PNNI9H. As part of the USGS's California State Waters Mapping Project, a 50-m grid of sediment thickness for the seafloor within the 3-nautical mile limit between Punta Gorda and Point Arena was generated from seismic-reflection data collected between 2010 and 2012, and supplemented with geologic structure (fault) information following the methodology of Wong (2012). Water depths determined from bathymetry data were added to the sediment thickness data to provide information on the depth to base of the post-LGM unit. Reference Cited: Wong, F. L., Phillips, E.L., Johnson, S.Y., and Sliter, R.W., 2012, Modeling of depth to base of Last Glacial Maximum and seafloor sediment thickness for the California State Waters Map Series, eastern Santa Barbara Channel, California: U.S. Geological Survey Open-File Report 2012-1161, 16 p. (available at https://pubs.usgs.gov/of/2012/1161/). To expand geologic mapping to the seafloor within the California's State Waters, to update coastal geologic mapping, and to contribute to a uniform regional geologic database, which can be used geographic information systems. Additionally, to aid in assessments and mitigation of geologic hazards in the Punta Gorda to Point Arena coastal region and to provide sufficient geologic information for land-use and land-management decisions both onshore and offshore. This information is not intended for navigational purposes. Additional information about the field activities from which these data were derived is available online at: https://cmgds.marine.usgs.gov/fan_info.php?fan=C110NC https://cmgds.marine.usgs.gov/fan_info.php?fan=B510NC https://cmgds.marine.usgs.gov/fan_info.php?fan=B0412NC Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in Esri format, this metadata file may include some Esri-specific terminology. 20100809 20120925 ground condition at time seismic data were collected Complete None planned -124.452888 -123.702617 40.300181 39.020333 ISO 19115 Topic Category environment geoscientificInformation oceans Data Categories for Marine Planning Physical Habitats and Geomorphology Distributions USGS Thesaurus marine geology seismic reflection methods maps and atlases stratigraphic thickness geospatial datasets Marine Realms Information Bank (MRIB) keywords sediment deposition seismic reflection profiling None U.S. Geological Survey USGS Coastal and Marine Hazards and Resources Program CMHRP Pacific Coastal and Marine Science Center PCMSC USGS Metadata Identifier USGS:5d12884de4b0941bde56eb59 Geographic Names Information System (GNIS) Pacific Ocean State of California Punta Gorda Point Delgada Shelter Cove Fort Bragg Mendocino Point Arena NGA GEOnet Names Server (GNS) Spanish Canyon Delgada Canyon Noyo Canyon None USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originator of the dataset and in products derived from these data. U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

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Santa Cruz CA 95060-5792 US 831-427-4747 pcmsc_data@usgs.gov https://www.sciencebase.gov/catalog/file/get/5d1288d4e4b0941bde56eb6b?name=DepthToTransition_PuntaGordaToPointArena.jpg&allowOpen=true Depth-to-Transition for the region between Punta Gorda and Point Arena JPEG Microsoft Windows Server 2008 R2 Version 6.1 (Build 7601) Service Pack 1; Esri ArcCatalog 10.0 Jeff W. Beeson Samuel Y. Johnson 2019 Open-File Report 2019-1072 Reston, VA U.S. Geological Survey https://doi.org/10.3133/ofr20191072 The data points from seismic-reflection profiles are dense along tracklines (about 1-2 m apart) and sparse between tracklines (typically 1,000 m apart). 50-m cell size for interpolation is better supported along track than between. No formal logical accuracy tests were conducted. All vector geometry and attributes are present. Sediment thickness data points exported from Kingdom Suite profiling software were processed within the California 3-nmi limit. The sparker position may vary as much as 20 m from the navigation reference on the vessel. Estimated to be approximately 1 m, along the track lines where data is well constrained, but may be much greater in areas where interpolation occurred. Beeson, J.W. Johnson, S.Y. Goldfinger, C. Hartwell, S.R. 2016 SEG-Y online U.S. Geological Survey https://doi.org/10.5066/F7GT5K8R SEG-Y 20100809 20120925 ground condition seismic digital seismic data from Punta Gorda to Point Arena used to interpret seafloor depth and subsurface geologic structure Jeff W. Beeson Samuel Y. Johnson 2019 shapefile U.S. Geological Survey data release doi: 10.5066/P9PNNI9H online U.S. Geological Survey https://doi.org/10.5066/P9PNNI9H shapefile 2019 publication date faults faults from Punta Gorda to Point Arena were used to interpret subsurface geologic structure Water bottom (seabed) and depth to base of the Last Glacial Maximum (LGM) horizons were digitized from seismic-reflection data using Kingdom Suite software. The difference between the two horizons was exported from Kingdom Suite for every shot point as XY coordinates (UTM Zone 10) and two-way travel time (TWT). The thickness was determined by applying a sound velocity to the TWT of 1,500 m/sec in water and 1,600 m/sec velocity in sediment, resulting in sediment thickness values. seismic faults 2017 SedimentThicknessPoints XY locations and sediment thickness values Z were imported to ArcGIS format as points and interpolated to a preliminary surface with TopoRaster from which isopachs (thickness contours) were extracted at 2.5 m intervals. Further refinement of this sediment thickness map and the isopach shapefile (see https://pubs.usgs.gov/ds/781/PuntaGordaToPointArena/data/Isopachs_PuntaGordaToPointArena.zip) was accomplished through several iterations of manual editing to incorporate geology and fault information following the methodology of Wong (2012; see https://pubs.usgs.gov/of/2012/1161/). SedimentThicknessPoints 2017 SedimentThickness XY locations and water bottom (seabed) values Z were imported to ArcGIS format as points and interpolated to a preliminary surface with TopoRaster. seismic 2017 seabed The depth to the base of the post-Last Glacial Maximum (LGM) unit was generated by adding the sediment thickness to water depth, as measured on the seismic-reflection data. SedimentThickness seabed 2017 DepthToTransition Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed. 20201102 U.S. Geological Survey Susan Cochran Geologist Mailing and Physical

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Santa Cruz CA 95060 831-460-7545 scochran@usgs.gov Raster Pixel 14132 6267 Universal Transverse Mercator 10 0.9996 -123.00000 0.00000 500000.0 0.00 row and column 50.0 50.0 Meters WGS84 WGS84 6378137.00 298.257223563 Value depth to transition, in meters Esri VALUE Depth in meters (water depth plus sediment thickness) to the transgressive surface Esri 20.94 250.09 meters 0.01 Grid value is water depth plus the thickness of sediment above the transgressive surface of the last glacial maximum, in meters. U.S. Geological Survey U.S. Geological Survey - ScienceBase mailing and physical

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Denver CO 80225 1-888-275-8747 sciencebase@usgs.gov The .zip file (DepthToTransition_PuntaGordaToPointArena.zip) includes the .lyr, .tfw, .tif, .tif.aux.xml, and .tif.ovr files, as well as FGDC-compliant metadata for the Depth-to-Transition data layer in the Punta Gorda to Point Arena region of California. Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), 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 any such warranty. geoTIFF ArcMap (version 10.0, Esri, 2011) Raster data layer is registered TIFF image in the UTM Zone 10 coordinate system The .zip file for the TIFF image includes the image (.tif), the world registration file (.tfw), geoTIFF accessory files, and FGDC-compliant metadata for the Depth-to-Transition data layer in the Punta Gorda to Point Arena region of California. Winzip 355.53 https://www.sciencebase.gov/catalog/file/get/5d12884de4b0941bde56eb59?facet=DepthToTransition_PuntaGordaToPointArena.zip https://doi.org/10.5066/P9PNNI9H https://pubs.usgs.gov/ds/781/ The first link will begin a direct download of the data. The second link is a landing page on which all of the downloadable data for a particular region are listed. The third link is a landing page for the entire data catalog. None. The downloadable data file has been compressed with the "zip" command and can be unzipped with Winzip (or other tool) on Windows systems. To utilize these data, the user must have software capable of uncompressing the WinZip file and importing and viewing an Esri ArcMap TIFF. Users should download the ArcGIS project file, PuntaGordaToPointArenaGIS.mxd.zip, a compressed (with the "zip" command) version of the ArcMap document (.mxd) that has all the data layers loaded in the table of contents for the "Punta Gorda to Point Arena" map region and has all the data symbolized as on the map sheets. Download and save this ArcGIS project file, including all data layers, to the directory the user has created for this GIS. 20201102 U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

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Santa Cruz CA 95060 831-427-4747 pcmsc_data@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998