Identification_Information: Citation: Citation_Information: Originator: Rowland W. Tabor, U.S. Geological Survey, Research Geologist, Emeritus Publication_Date: 20171106 Title: Lidar-Revised Geologic Map of the Des Moines 7.5' Quadrangle, King County, Washington Geospatial_Data_Presentation_Form: vector digital data Series_Information: Series_Name: U.S. Geological Survey Scientific Investigations Map Issue_Identification: 3384 Other_Citation_Details: Suggested citation: Tabor, R.W., and Booth, D.B., 2017, Lidar-revised geologic map of the Des Moines 7.5' quadrangle, King County, Washington: U.S. Geological Survey Scientific Investigations Map 3384, pamphlet 17 p., scale 1:24,000, https://doi.org/10.3133/sim3384 Description: Abstract: The geology of the Des Moines 7.5-minute quadrangle expresses much of the tremendous range of Quaternary environments and deposits found throughout the central Puget Lowland. The topography is dominated by an extensive upland plain, mantled by a rolling surface of glacial till deposited about 17,000 (14,000 radiocarbon) years ago during the last occupation of the Puget Lowland by a great continental ice sheet. Coursing between the hills of this upland surface, and in places lapping up onto their flanks, are the remnants of deposits of long-vanished rivers that issued from the snout of the retreating ice sheet as it withdrew to the north. Beneath these ice-sheet deposits is a complex sequence of older unconsolidated sediments that extends far below sea level across most of the quadrangle. These older sediments are exposed only where modern erosion has sliced through the younger glacial deposition notably by the Green River and its precursor, the now-in filled Duwamish estuary, along the eastern boundary of the upland plain; by wave action along Puget Sound to the west; and also by Des Moines Creek, Miller Creek, and several smaller drainages. These older sediments are very compact, having been weighted down by glaciers during one or more episodes of glaciation subsequent to their deposition. Many are also cemented by iron oxides and hydroxides, a consequence of the many tens or hundreds of thousands of years of weathering that they have experienced. Excellent exposures of this older Pleistocene sequence are displayed in the coastal bluffs of the quadrangle, although human activity is concealing these exposures at a rapid rate. Bedrock is exposed only in the northeast corner of the quadrangle. Indeed, over most of the map area, rock typically lies at depths of from 300 to more than 1,500 meters (Jones, 1996). Exposed bedrock consists of marine and continental sedimentary rocks and isolated intrusions, all of early Tertiary age. The thickness of these Tertiary rocks cannot be accurately measured in the quadrangle, but more extensive exposures farther east indicate a thickness in excess of one kilometer. The quadrangle also is located at the center of the intensively developing urban core of the Puget Lowland region. Only a few kilometers to the north lies the city of Seattle; about 20 kilometers to the south is the city of Tacoma. Within the boundaries of the quadrangle lie all or part of the cities of Kent, Burien, Des Moines, Normandy Park, SeaTac, and Tukwila, having a combined population in the quadrangle in 2010 of almost 208,000. Seattle-Tacoma International Airport is located near the center of the quadrangle, perched high in the center of the upland plain. Interstate 5, the main north-south highway through the Pacific Northwest, traverses the entire length of the quadrangle. Increasing population and a strong transportation network have fostered urban and suburban development in almost every area of the quadrangle. This development, in turn, is causing some of the most rapid geomorphic changes to occur since the wastage of the ice sheet. Purpose: This database and accompanying files depict the distribution of geologic materials and structures at 1:24,000 scale. The report is intended to provide geologic information for the study of materials properties, earthquake shaking, landslide potential, mineral hazards, seismic velocity, and earthquake faults. In addition, the report contains new information and interpretations about the regional geologic history and framework. However, the scale of this report does not provide sufficient detail for site development purposes. Supplemental_Information: SIM3384.gdb is a composite geodataset that conforms to "GeMS (Geologic Map Schema)--a standard format for digital publication of geologic maps, version 2.0", available at http://ngmdb.usgs.gov/Info/standards/GeMS/. The geodatabase contains the following elements: non-spatial table DescriptionOfMapUnits (48 rows); non-spatial table DataSources (19 rows); non-spatial table Glossary (24 rows); non-spatial table MiscellaneousMapInformation (17 rows); non-spatial table GeoMaterialDict (101 rows); feature dataset GeologicMap which contains feature class MapUnitPolys (582 features), feature class OverlayPolys (22 features), feature class ContactsAndFaults (954 features), feature class GeologicLines (21 features), feature class MapUnitPolysAnno (444 features), feature class SamplePointsAnno (8 features), feature class SamplePoints (8 features), and feature class OrientationPointLabels (13 features). Metadata records associated with each of these elements contain more detailed descriptions of their purposes, constituent entities, and attributes. Non-spatial tables DataSources, DescriptionOfMapUnits, and Glossary store metadata. Non-spatial table GeoMaterialDict describes a simplified classification of earth materials based on general lithologic and genetic character. All spatial features and some non-spatial features have related entries in table DataSources. Table DescriptionOfMapUnits defines and describes geologic map units that are delimited in feature class MapUnitPolys. Most technical terms used as feature attributes (including all TYPE terms and all CONFIDENCE terms) are defined in table Glossary. Most features have explicit internal feature-level metadata, including LocationConfidenceMeters, one or more Source attributes, and--as appropriate--ExistenceConfidence, IdentityConfidence, and OrientationConfidenceDegrees. Two shapefile versions of the dataset are also available. The COMPLETE shapefile version consists of shapefiles, DBF files, and delimited text files and retains all information in the native geodatabase, but has limited usability. The SIMPLE shapefile version consists only of shapefiles and is easily used, but lacks some information present in the native geodatabase. These metadata were generated with script GeMS_MetadataCSDGM2_Arc10.py, version of 2 September 2017. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 20040101 Currentness_Reference: Des Moines 7.5-minute quadrangle, Washington. Geology mapped by D.B. Booth, 1986-1998, 2004; H.H. Waldron, 1956-1958; and K.G. Troost, 2004. Revision by Rowland W. Tabor, 2008-2015. Base-map culture cartography interpreted from lidar by Rowland W. Tabor, 2008-2013. Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -122.380259 East_Bounding_Coordinate: -122.247843 North_Bounding_Coordinate: 47.501449 South_Bounding_Coordinate: 47.373184 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: fault Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Categories Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Newcastle anticline Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Cordilleran ice sheet Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: glaciation Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Puget lobe Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: radiocarbon Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: groundwater Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Tukwila Formation Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Zebra beds Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: glacial stratigraphy Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Fenwick block slide Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: landslide Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Puget Group Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: lacustrine deposits Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: lahar Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: paleomagnetic Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Pre-Olympia deposits Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: geology Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: alluvium Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Renton Formation Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Fraser glaciation Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: till Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Osceola mudflow Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: lidar Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Vashon stade Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Lake Russell Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: recessional deposits Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: geologic map Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: outwash deposits Place: Place_Keyword_Thesaurus: None Place_Keyword: Duwamish River Place: Place_Keyword_Thesaurus: None Place_Keyword: Maury Island Place: Place_Keyword_Thesaurus: None Place_Keyword: Midway landfill Place: Place_Keyword_Thesaurus: None Place_Keyword: Bow Lake Place: Place_Keyword_Thesaurus: None Place_Keyword: Burien Place: Place_Keyword_Thesaurus: None Place_Keyword: Angle Lake Place: Place_Keyword_Thesaurus: None Place_Keyword: Green River Place: Place_Keyword_Thesaurus: None Place_Keyword: Skyway Place: Place_Keyword_Thesaurus: None Place_Keyword: King County Place: Place_Keyword_Thesaurus: None Place_Keyword: Des Moines Creek Place: Place_Keyword_Thesaurus: None Place_Keyword: Tukwila Place: Place_Keyword_Thesaurus: None Place_Keyword: SeaTac Place: Place_Keyword_Thesaurus: None Place_Keyword: Des Moines Place: Place_Keyword_Thesaurus: None Place_Keyword: Puget Lowland Place: Place_Keyword_Thesaurus: None Place_Keyword: Puget Sound Place: Place_Keyword_Thesaurus: None Place_Keyword: Normandy Park Place: Place_Keyword_Thesaurus: None Place_Keyword: Kent Highlands landfill Place: Place_Keyword_Thesaurus: None Place_Keyword: Washington State Place: Place_Keyword_Thesaurus: None Place_Keyword: Miller Creek Temporal: Temporal_Keyword_Thesaurus: None Temporal_Keyword: Eocene Temporal: Temporal_Keyword_Thesaurus: None Temporal_Keyword: Holocene Temporal: Temporal_Keyword_Thesaurus: None Temporal_Keyword: Pleistocene Temporal: Temporal_Keyword_Thesaurus: None Temporal_Keyword: Tertiary Temporal: Temporal_Keyword_Thesaurus: None Temporal_Keyword: Quaternary Access_Constraints: None Use_Constraints: Use at own risk Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Ralph A. Haugerud Contact_Position: Research Geologist Contact_Address: Address_Type: mailing Address: Dept. Earth and Space Sciences, University of Washington, Box 351310 City: Seattle State_or_Province: Washington Postal_Code: 98195 Country: US Contact_Voice_Telephone: 206-713-7453 Contact_Electronic_Mail_Address: rhaugerud@usgs.gov Native_Data_Set_Environment: Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.4.1.5686 Spatial_Data_Organization_Information: Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Map_Projection: Map_Projection_Name: NAD 1983 HARN StatePlane Washington North FIPS 4601 Feet Lambert_Conformal_Conic: Standard_Parallel: 47.5 Standard_Parallel: 48.73333333333333 Longitude_of_Central_Meridian: -120.8333333333333 Latitude_of_Projection_Origin: 47.0 False_Easting: 1640416.666666667 False_Northing: 0.0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.0003280833333333333 Ordinate_Resolution: 0.0003280833333333333 Planar_Distance_Units: foot_us Geodetic_Model: Horizontal_Datum_Name: D North American 1983 HARN Ellipsoid_Name: GRS 1980 Semi-major_Axis: 6378137.0 Denominator_of_Flattening_Ratio: 298.257222101 Metadata_Reference_Information: Metadata_Date: 20170811 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Ralph A. Haugerud Contact_Position: Research Geologist Contact_Address: Address_Type: mailing Address: Dept. Earth and Space Sciences, University of Washington, Box 351310 City: Seattle State_or_Province: Washington Postal_Code: 98195 Country: US Contact_Voice_Telephone: 206-713-7453 Contact_Electronic_Mail_Address: rhaugerud@usgs.gov Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: local time Metadata_Use_Constraints: Use at own risk Entity_and_Attribute_Information: