Browsing by Author "Green, John C"

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    M-199, Bedrock Geology of the Mark Lake Quadrangle, Cook County, Minnesota
    (Minnesota Geological Survey, 2018) Boerboom, Terrence J; Green, John C
    Portrays the bedrock geology of the Mark Lake quadrangle which prior to this effort was largely unmapped. The map shows the distribution of the various rock types, locations of bedrock outcrops, and structural attributes of the bedrock. Mapped outcrops were used to constrain the geology for the most part, but mapping was augmented by the use of geophysical maps, and lidar imagery. Lidar was especially useful in locating bedrock outcrops during field work, and also for delineating the various bedrock units during the map compilation stage following fieldwork.
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    The Owen-Norwood Survey of 1847-1850 - THe first geological survey of the northeast Minnesota region - and its context in the evolution of geological science
    (Minnesota Geological Survey, 2022) Green, John C
    The Owen/Norwood geological survey of Minnesota’s North Shore of Lake Superior – the first geological survey in this area - was carried out in a dynamic period of both American socioeconomic history and the growth of the science of geology. It was begun in 1847, as the U. S. Government had charged David Dale Owen with surveying most of WI, MN, IA and part of NB. Owen was assisted in much of this huge area by other notable geologists; Joseph G. Norwood examined the North Shore and adjacent areas. This was part of the “manifest destiny” of Euroamerican occupation of North America. Access to the interior of the Old Northwest was facilitated by successive treaties with Native Americans (mostly Chippewa), in which lands in MI and WI were ceded in 1836, 1837, and 1842 to the U. S. Government. The U. S. wanted to determine what the mineral potential might be for an anticipated land cession in the wilderness of northern MN Territory.