![]() ![]() Apparently shallow lakes connected by well-defined channels occupied the floor of Green Bay during Holocene times of lower lake level. The Two Rivers end moraine, marking the outer limits of a significant readvance of retreating Wisconsin ice, extends across the lake between Manitowoc and Ludington. Morphology of the Mid-Lake Plateau, a cuesta defended by eastward-dipping, presumed Devonian limestones, is more accurately revealed. This delta and channel are evidence of overflow, possibly catastrophic, of Lake Superior into Lake Michigan via the Au Train-Whitefish Channel during the Lake Chippewa low stand. A large drowned river channel leads upstream from this delta, across the floor of Green Bay and into Little Bay De Noc. A drowned delta lying at depths of 50 to 60m dominates the lake floor east of Washington Island. The Mackinac Channel, a subaerial river channel which drained Lake Chippewa, has a sill depth of about 30m and extends from north of Garden Island eastward through the Straits of Mackinac. This bathymetry resolves physiography of the lake floor to an extent that known features are revealed more accurately and features never before seen are revealed for the first time. Bathymetric contours were scanned and vectorized to geographic coordinates from scale 1:250000 compilation sheets. ![]() Was compiled utilizing the entire historic sounding data base. Ridges and Valleys in the Islands Area (area 6).Regional Mapsġ:1,000,000 scale maps compiled from 1:250,000 scale bathymetric maps.Bathymetry of Lake Michigan Great Lakes Data Rescue Project - Lake Michigan Bathymetry There are no plans to have these maps published. Left in the production process but are sufficiently developed to include accurate bathymetric data. NOAA provides blackline copies of compilation manuscripts for bathymetric maps that were The SEAMAP SERIES at a scale of 1:1,000,000,Ĭovers geophysical data gathered in the deep-sea area, sometimes including the adjacent Continentalīathymetric maps that have been compiled, but are not Geophysical data for the Continental Shelf and slope. Maps, serves as a base for making geological-geophysical studies of the oceans bottom's crustal The bathymetric map, when combined with the other Practicable a sediment overprint (NOS 1308N-17S). Geophysical MapsĮach consist of three sheets (a base bathymetric map, a magnetic map, and a gravity map), and where Seafloor features and potential fishing grounds. This product is intended to aid fishermen and Topographic maps of the sea floor, produced at a 1:100,000 scale that contain Loran-C rates, bottom sediment types and known bottom obstructions. Management Service's OCS Protraction Diagram data. All 1:250,000 and 1:1000,000 maps are overprinted with the Minerals Geologists, and those interested in the coastal zone and the Outer Continental Shelf's (OCS) They may also be used by land-use planners, conservationists, oceanographers, marine Maps support the Coastal Zone Management and Energy Impact Programs and the offshore oil and gas Geological Survey (USGS) land topography. Topo/Bathy Mapsĭetailed multipurpose maps of NOS bathymetry and US Studies, that are required in the development of energy and marine resources. Serves as a tool for performing scientific, engineering, marine geophysical and environmental Detailed depth contours provide the size, shape and distribution of underwater features. ![]()
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