Samuel Y. Johnson Stephen R. Hartwell Janet T. Watt Ray W. Sliter 2014 vector digital data Data Series DS 781 Reston, VA U.S. Geological Survey https://doi.org/10.3133/ds781 https://pubs.usgs.gov/ds/781/SaltPointToDrakesBay/data_catalog_SaltPointToDrakesBay.html Nadine E. Golden 2013 database Data Series DS 781 Reston, VA U.S. Geological Survey https://doi.org/10.3133/ds781 This part of DS 781 presents data for the transgressive contours for the Salt Point to Drakes Bay, California, region. The vector file is included in "TransgressiveContours_SaltPointToDrakesBay.zip," which is accessible from https://pubs.usgs.gov/ds/781/SaltPointToDrakesBay/data_catalog_SaltPointToDrakesBay.html. As part of the USGS's California State Waters Mapping Project, a 20-m grid of depth to the transgressive surface of the last glacial maximum was generated for the areas within the 3-nautical mile limit between Salt Point and Drakes Bay was generated from seismic-reflection data collected in 2009 supplemented with outcrop and geologic structure from DS 781. The resulting grid covers an area of approximately 550 sq km. The depth to the transgressive surface of the Last Glacial Maximum ranges between 0 and 102 meters. These data are intended for science researchers, students, policy makers, and the general public. The data can be used with geographic information systems (GIS) software to display geologic and oceanographic information. Additional information about the USGS field activity from which some of these data were derived is available online at: https://cmgds.marine.usgs.gov/fan_info.php?fan=S809NC 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. 2009 ground condition Complete None planned -123.473993 -122.762732 38.640196 37.868433 USGS Metadata Identifier USGS:2734a6ab-6077-4249-890a-f9807ed6fb9d USGS Thesaurus marine geology seismic reflection methods maps and atlases stratigraphic thickness geospatial datasets None coastal geology sediment thickness sediment isopach seismic-reflection data ISO 19115 Topic Category environment geoscientificInformation oceans Geographic Names Information System Pacific Ocean State of California Bodega Bay Marin County Sonoma County Point Reyes No access constraints 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 and California State University, Monterey Bay, Seafloor Mapping Lab (CSUMB) as the originator(s) of the dataset and in products derived from these data. This information is not intended for navigation purposes. U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

2885 Mission Street

Santa Cruz CA 95060-5792 US 831-427-4747 pcmsc_data@usgs.gov https://pubs.usgs.gov/ds/781/SaltPointToDrakesBay/images/TransgressiveContours_SaltPointToDrakesBay.jpg Map of depth-to-transition contours in the Salt Point to Drakes Bay region of California JPEG Microsoft Windows Server 2008 R2 Version 6.1 (Build 7601) Service Pack 1; ESRI ArcCatalog 10.0 Data points are approximately 1 m apart along tracklines and 1000-2000 m apart between tracks. 50-m cell size for interpolation is better supported along track than between. All vector geometry and attributes present. Sediment thickness data points exported from Seisworks profiling software were processed within the California 3-nmi limit. The chirp sonar instrument is deployed under the research vessel with about 10m of variation in position. The sparker position may vary as much as 20m 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. U.S. Geological Survey (USGS), Coastal and Marine Geology Program (CMGP) 2013 Menlo Park, CA U.S. Geological Survey (USGS), Coastal and Marine Geology (CMG) https://cmgds.marine.usgs.gov/fan_info.php?fan=S809NC ASCII lat/long shot point files 20090908 20090930 ground condition S-8-09-NC Digital seismic data used to interpret subsurface geologic structure Chirp and sparker seismic-reflection data from USGS field activity S-8-09-NC were imported to SEISWORKS. 2013 Seabed and depth to Last Glacial Maximum horizons digitized in Seisworks. 2013 Data exported and converted with 1500m/sec velocity in water and 1600 m/sec velocity in sediment. 2013 X, Y locations and sediment thickness value Z imported to ArcGIS format as points, interpolated to preliminary surface with TopoRaster. Because processing of the related sediment thickness map resulted in an interpolated surface that diverged from the data exported from Seisworks, the final transgressive surface was calculated by subtracting sediment thickness from multibeam bathymetry. 2013 Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed. 20201019 U.S. Geological Survey VeeAnn A. Cross Marine Geologist Mailing and Physical

384 Woods Hole Road

Woods Hole MA 02543-1598 508-548-8700 x2251 508-457-2310 vatnipp@usgs.gov Edited metadata to add USGS Thesaurus keywords and perform minor edits to bring the metadata up to current PCMSC standards. No data were changed. The metadata available from a harvester may supersede metadata bundled within a download file. Users are advised to compare the metadata dates to determine which metadata file is most recent. 20211021 U.S. Geological Survey Susan Cochran Geologist Mailing and Physical

2885 Mission Street

Santa Cruz CA 95060 831-460-7545 scochran@usgs.gov Information about the data available for download and different Network Resource Name links and details were given in the Standard Order Process section. Minor typos were corrected. No data information was changed. The metadata available from a harvester may supersede metadata bundled within a download file. Users are advised to compare the metadata dates to determine which metadata file is most recent. 20230324 Susan A Cochran U.S. Geological Survey, Pacific Coastal and Marine Science Center Geologist mailing and physical address

2885 Mission Street

Santa Cruz CA 95060-5792 USA (831) 460-7545 scochran@usgs.gov Minor correction was made to the Field Activity Number. No data information was changed. The metadata available from a harvester may supersede metadata bundled within a download file. Users are advised to compare the metadata dates to determine which metadata file is most recent. 20250514 Manda V. Au U.S. Geological Survey, Pacific Coastal and Marine Science Center Data Management Specialist mailing and physical address

2885 Mission Street

Santa Cruz CA 95060-5792 USA (831) 460-7575 mau@usgs.gov Vector String 779 Universal Transverse Mercator 10 0.999600 -117.000000 0.000000 500000.000000 0.000000 row and column 20.000000 20.000000 meters D_WGS_1984 WGS_1984 6378137.000000 298.257224 NAVD88 20.0 meters Implicit coordinate Transgressive_contours lines of equal depth to transgressive surface standard sedimentology FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. ID sequential feature number this study sequential feature numbers CONTOUR Lines of equal depth to transgressive surface this study depth to transgressive surface using a 5 meter contour interval Type Type of contour This report Index Contour at 10m interval This report Intermediate Contours at 5m interval This report U.S. Geological Survey mailing and physical address

345 Middlefield Rd

Menlo Park CA 94025-3561 USA (650) 329-4309 The .zip file includes the .aux, .dbf, .shp, .shx, .sbx, and .sbn files, as well as FGDC-compliant metadata. 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. shapefile File TransgressiveContours_SaltPointToDrakesBay.zip contains ESRI Shapefile, TransgressiveContours_SaltPointToDrakesBay, with associated files created by ArcGIS. 3.9 https://pubs.usgs.gov/ds/781/SaltPointToDrakesBay/data/TransgressiveContours_SaltPointToDrakesBay.zip https://pubs.usgs.gov/ds/781/BolinasToPescadero/data_catalog_BolinasToPescadero.html 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 20250514 U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

2885 Mission Street

Santa Cruz CA 95060-5792 US 831-427-4747 pcmsc_data@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998 local time