{
    "tag": 15449,
    "title": "PAC_EXT - Extracted seabed data for the continental margin of the U.S. Pacific Coast (California, Oregon, Washington) from usSEABED (pac_ext.txt)",
    "pubdate": "2006",
    "sername": null,
    "series_name": null,
    "issue": "182",
    "publish": null,
    "publisher_name": null,
    "onlink": "https:\/\/cmgds.marine.usgs.gov\/catalog\/pcmsc\/SeriesReports\/DS_DDS\/DS_182\/pac_ext.faq.html",
    "format": null,
    "email": null,
    "descript": "This data layer (PAC_EXT.txt) is one of five point coverages of known sediment samples, inspections, and probes from the usSEABED data collection for the U.S. Pacific continental margin integrated using the software system dbSEABED. This data layer represents the extracted (EXT) output of the dbSEABED mining software and contains data items which were extracted from the data resources files and generally represent lab-based analytical data. The EXT data are usually considered the most rigorous data available, although some data may represent a subsample of the sediment (that is, large shells or stones may have been excluded from the analysis). This file contains the same data fields as the parsed (PAC_PRS) and calculated (PAC_CLC) data files, and the three files may be combined.",
    "lang": null,
    "journal": null,
    "pwid": null,
    "originator": [
        {
            "name": "Reid, Jane A.",
            "role": "Author"
        },
        {
            "name": "Reid, Jamey M.",
            "role": "Author"
        },
        {
            "name": "Jenkins, Chris J.",
            "role": "Author"
        },
        {
            "name": "Zimmermann, Mark",
            "role": "Author"
        },
        {
            "name": "Williams, S. Jeffress",
            "role": "Author"
        },
        {
            "name": "Field, Michael E.",
            "role": "Author"
        }
    ],
    "index_term": [
        {
            "thcode": 2,
            "code": "464",
            "name": "geology",
            "scope": "Study of the planet earth, its composition, structure, physical and chemical processes, and history since its origin."
        },
        {
            "thcode": 2,
            "code": "500",
            "name": "gravel deposits",
            "scope": "Alluvial accumulations of small unconsolidated rock fragments, such as pebbles and cobbles, used in construction as fill, ground cover, or aggregate for concrete."
        },
        {
            "thcode": 2,
            "code": "798",
            "name": "nonmetallic mineral resources",
            "scope": "Useful mineral deposits that are not metals.  Includes materials used for construction, decoration, fuel, and industrial purposes."
        },
        {
            "thcode": 2,
            "code": "1011",
            "name": "sand deposits",
            "scope": "Deposits of loose particles of rock or mineral (sediment) that range in size from 0.0625-2.0 millimeters in diameter."
        },
        {
            "thcode": 2,
            "code": "1025",
            "name": "sea-floor characteristics",
            "scope": "Geomorphic features and geographic, compositional, and textural variation in the materials composing the ocean floor. Includes both large-scale structures (such as seamounts and rises) and fine-scale variations in rocks and deposits on the sea floor."
        },
        {
            "thcode": 2,
            "code": "1199",
            "name": "unconsolidated deposits",
            "scope": "Loosely bound sediments such as sand, gravel, and silt which tend to accumulate in low areas or valleys."
        },
        {
            "thcode": 15,
            "code": "008",
            "name": "geoscientificInformation",
            "scope": "Information pertaining to earth sciences, for example geophysical features and processes, geology, minerals, sciences dealing with the composition, structure and origin of the earth's rocks, risks of earthquakes, volcanic activity, landslides, gravity information, soils, permafrost, hydrogeology, groundwater, erosion"
        },
        {
            "thcode": 15,
            "code": "013",
            "name": "location",
            "scope": "Positional information and services, for example addresses, geodetic networks, geodetic control points, postal zones and services, place names, geographic names"
        },
        {
            "thcode": 15,
            "code": "014",
            "name": "oceans",
            "scope": "Features and characteristics of salt water bodies (excluding inland waters), for example tides, tidal waves, coastal information, reefs, maritime, outer continental shelf submerged lands, shoreline"
        },
        {
            "thcode": 23,
            "code": "3",
            "name": "Distributions",
            "scope": "Locations or patterns of a feature of interest across space and (or) time. These data can include point data, lines, polygons, and temporal data at any scale relevant to CMSP and can be produced by observation, interpolation, or modeling. Distributions can also include maps or statistics of climatology, the environmental values that are expected to be observed at the present time."
        },
        {
            "thcode": 23,
            "code": "18",
            "name": "Sand Resources",
            "scope": "Includes deposits of unconsolidated particles of biogenic or mineral sediments with a dominant particle size ranging from 0.0625-2.0 millimeters in diameter; the deposits may be located offshore as sand beds or onshore as dunes and beaches. Distributions are recorded observations or models of sediment size, composition, and deposit thickness in a location or area, including maps of sand resources compiled through observations, interpreted data, remote sensing data, geologic maps, and hydrodynamic models. Assessments are evaluations of total sand availability; models of present sand deposition and resuspension rates; models of difficulty of extraction, relocation, or protection; and models of ecological and economic value. Predictions are the results of models or projections of future distributions, values, or ecological impacts of sand resources; these data include predicted changes to sand beds due to natural and human forces; scenario-based models of sand resource losses or gains under different management strategies of mining, extraction, relocation, dredging-related deposition, beach nourishment, or hard structure placement (for example, on beaches); and projections of the effects of human alterations to sand resources on other resources or on ecological function."
        },
        {
            "thcode": 23,
            "code": "23",
            "name": "Substrate",
            "scope": "Represents the character and composition of the surface and near surface of the sea floor in subtidal or intertidal areas, as defined in the Substrate Component of CMECS or in similar classification systems. Distributions are records of substrate characteristics based on visual or photographic inspection or on analysis of samples and cores, and they also include interpretive maps classifying areas on the basis of combinations of observations, hydrodynamic models, or geological models. Assessments include evaluations of present ecological or economic values of substrate distributions, drivers of substrate change, and functions of substrates. Predictions are the results of models or projections of future substrate distributions, values, or ecological impacts, including predicted substrate changes due to natural and human forces including erosion, accretion, sea-level change, extraction, trawling, or other factors; and they are the results of scenario-based models of substrate changes on ecological or economic values under different management strategies or other human alterations."
        },
        {
            "thcode": 61,
            "code": "170",
            "name": "sand deposit",
            "scope": "unconsolidated sand laid down by wind or water."
        },
        {
            "thcode": 61,
            "code": "173",
            "name": "seabed",
            "scope": "the floor of a sea or ocean."
        },
        {
            "thcode": 61,
            "code": "382",
            "name": "sediment resources",
            "scope": "used for the economic and environmental aspects of aggregate mining in coastal and marine environments."
        },
        {
            "thcode": 62,
            "code": "GC-042",
            "name": "Borderland",
            "scope": "Physiographic Setting: An area of the continental margin (between the shoreline and the continental slope) that is topographically more complex than the continental shelf. ..."
        },
        {
            "thcode": 62,
            "code": "GC-044",
            "name": "Continental\/Island Shelf",
            "scope": "Physiographic Setting: That part of the continental margin that is between the shoreline and the continental slope (or a depth or 200 meters when there is no noticeable continental slope); it is characterized by its very gentle slope of 0.1\u00b0. ..."
        },
        {
            "thcode": 62,
            "code": "GC-046",
            "name": "Continental\/Island Slope",
            "scope": "Physiographic Setting: That part of the continental margin that is between the continental shelf and the continental rise (if there is one); it is characterized by its relatively steep slope of 1.5 - 6\u00b0. ..."
        },
        {
            "thcode": 62,
            "code": "AS-007",
            "name": "Estuarine Coastal",
            "scope": "Subsystem: The Estuarine Coastal Subsystem extends from the supratidal zone at the land margin up to the 4 meter depth contour in waters that have salinity greater than 0.5 (during the period of average annual low flow). ..."
        },
        {
            "thcode": 62,
            "code": "AS-004",
            "name": "Marine Nearshore",
            "scope": "Subsystem: The Marine Nearshore Subsystem extends from the landward limit of the Marine System to the 30 meter depth contour. ..."
        },
        {
            "thcode": 62,
            "code": "AS-005",
            "name": "Marine Offshore",
            "scope": "Subsystem: The Marine Offshore Subsystem extends from the 30 meter depth contour to the continental shelf break, as defined by the maximum slope discontinuity with a rapid change in gradient of 3\u00b0 or greater at the outer edge of the continental shelf. ..."
        },
        {
            "thcode": 62,
            "code": "SC-026",
            "name": "Rock Substrate",
            "scope": "Substrate Class: Igneous, metamorphic, or sedimentary rock with particle sizes greater than or equal to 4.0 meters (4,096 millimeters) in any dimension that cover 50% or greater of the Geologic Substrate surface."
        },
        {
            "thcode": 62,
            "code": "SC-029",
            "name": "Unconsolidated Mineral Substrate",
            "scope": "Substrate Class: Geologic Substrates with less than 50% cover of Rock Substrate. ..."
        }
    ],
    "place_term": [],
    "image": [
        {
            "name": "https:\/\/pubs.usgs.gov\/ds\/2006\/182\/data\/pac_ext.jpg",
            "description": "Image map showing extent of data layer coverage"
        }
    ],
    "fan": []
}