Great Lakes Geographic Information System Institute for Fisheries Research 20061213 Ann Arbor, MI Great Lakes Information Network (GLIN) http://gis.glin.net/ogc/services.php#lm_substclass_grd_ifr Lake Michigan substrate summarized by 10-minute grid cells across the lake. A composite map of substrate composition was created from two separate surveys of surficial sediments of Lake Michigan. For Lake Michigan south of Frankfort, a sediment survey map by Powers and Robertson (1968), that essentially corroborated two earlier surveys by Hough (1935) and Ayers and Hough (1963-64), was used. Sediment composition of Lake Michigan north of Pentwater was available from unpublished Lake Survey data of NOS-NOAA (Great Lakes Basin Framework Study 1976). We created a composite map by overlaying the northern and southern survey maps, and merging areas of like sediment type. Distinctive characteristics iclud hard bottom areas along the southwest shoreline (Milwaukee to Gary, IN), depositional areas in southern and northern basins, and a varied mix of sand-hard bottom in reef areas of northeast Lake Michigan. To create a continuous substrate layer across Lake Michigan for research purposes. Summary: Substrate type summarized by 10-minute grid cell unknown ground condition Complete Complete -88.043340 -84.724722 46.103679 41.619113 ISO 19115 Topic Category geoscientificInformation Uncontrolled Keywords Lake Michigan Great Lakes None None Shapefile Christine Geddes University of Michigan Project Coordinator Mailing and Physical

Institute for Fisheries Research, 212 Museums Annex Bldg, 1109 N. University Ave.

Ann Arbor Michigan 48109-1084 734-663-3554 x 121 cgeddes@umich.edu WMS-based PNG preview of dataset at full extent PNG GNU/Linux i686 i386 Great Lakes Geographic Information System Institute for Fisheries Research unknown 2009-12-30T11:38:14-04:00 Christine Geddes University of Michigan Project Coordinator Mailing and Physical

Institute for Fisheries Research, 212 Museums Annex Bldg, 1109 N. University Ave.

Ann Arbor Michigan 48109-1084 734-663-3554 x 121 734-663-9399 cgeddes@umich.edu FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 Pete Giencke Great Lakes Commission Lead Systems Developer Mailing and Physical

2805 S. Industrial Hwy, Suite 100

Ann Arbor MI 48104 (734) 971-9135 x132 (734) 971 - 9150 pgiencke@glc.org lm_substclass_grd_ifr Disclaimer. The Great Lakes Commission (GLC) and the Great Lakes Information Network (GLIN) cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. The Great Lakes Commission (GLC) and the Great Lakes Information Network (GLIN) make no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty. Shapefile Substrate type summarized by 10-minute grid cell Shapefile compressed with GNU zip GNU/Linux i686 i386 GML Substrate type summarized by 10-minute grid cell Geographic Markup Language (GML) compressed with GNU zip GNU/Linux i686 i386 SVG Substrate type summarized by 10-minute grid cell No compression applied GNU/Linux i686 i386 PDF Substrate type summarized by 10-minute grid cell No compression applied GNU/Linux i686 i386 none GCS_North_American_1983 Decimal Degrees 0.01757812 0.01757812