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    <dct:description>Bear Lake is a tectonic lake that has existed for at least several hundred thousand years. The lake basin is a relatively simple half graben, a spoon-shaped depression tilted toward the main fault on the east side of the lake. The U.S. Geological Survey, in cooperation with researchers from several universities, has been studying the sediments of Bear Lake since 1996. The general purpose of this effort is to reconstruct past limnological conditions and regional climate on a range of timescales, from hundreds of years to hundreds of thousands of years. This research relates to a variety of human concerns, including water usage in the Bear River basin. Past work has included several coring operations, a seismic-reflection survey, sediment-trap deployments, a barge-mounted drilling operation with the GLAD800 drill rig, and a variety of other studies. The objectives of the September, 2002 operations, preliminarily reported here, were (1) to compile a detailed bathymetric map of the lake using swath-mapping techniques, in order to provide baseline data for a variety of applications and studies, and (2) to complete a sidescan-sonar survey of the lake, providing a nearly complete acoustic image of the lake floor. Limited amounts of subbottom acoustic-reflection data (chrip) were also collected, along with samples of lake-floor sediments representative of different kinds of backscatter patterns. These surveys followed an earlier subbottom acoustic-reflection survey (1997), using boomer and 3.5 kHz systems (S. M. Colman, unpublished data).</dct:description>
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        <dcat:keyword>usgs</dcat:keyword>
        <dcat:keyword>coastal and marine geology program</dcat:keyword>
        <dcat:keyword>cmgp</dcat:keyword>
        <dcat:keyword>woods hole science center</dcat:keyword>
        <dcat:keyword>whsc</dcat:keyword>
        <dcat:keyword>field activity serial number 02031</dcat:keyword>
        <dcat:keyword>contours</dcat:keyword>
        <dcat:keyword>polyline shapefile</dcat:keyword>
        <dcat:keyword>bear lake</dcat:keyword>
        <dcat:keyword>utah</dcat:keyword>
        <dcat:keyword>idaho</dcat:keyword>
        <dcat:keyword>western lakes</dcat:keyword>
        <dcat:keyword>north america</dcat:keyword>
        <dcat:keyword>united states</dcat:keyword>
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    <dct:title>02031_BATHY_5M - 5 meter bathymetric contours derived from data collected during U.S. Geological Survey Geophysical Surveys of Bear Lake, Utah-Idaho, September, 2002 (02031)</dct:title>
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            <rdf:value>["Although these data have been used by the U.S. Geological Survey (USGS), U.S. Department of the Interior (DOI), no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials.\n\nAny use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government."]</rdf:value>
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            <rdf:value>["Use Constraints: These data are not to be used for navigation purposes. Mariners should refer to the appropriate nautical chart. Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the originator of the dataset.", "Access Constraints: None."]</rdf:value>
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