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U.S. Geological Survey aerial resistivity map of the Decorah, Iowa area, showing the Decorah crater.. A much older meteorite strike created the Decorah crater during the Middle Ordovician Period, 470 million years ago.
In 1991 and 1992 the U.S. Geological Survey along with others including the Iowa Geological Survey conducted detailed research in part to test the possible connection of the Manson impact structure with the Cretaceous–Paleogene extinction event. The 40 Ar / 39
1889 Preliminary Annotated Catalogue of the Birds of Iowa. Proc. of the Davenport Academy of Natural Sciences, Vol. V, pp. 113–161. 1894 Coal Deposits of Iowa Iowa Geological Survey; 1895 Geology of Des Moines County. Iowa Geological Survey, Des Moines. 1895 Origin and Relation of Central Maryland Granites, U.S. Geological Survey.
The Decorah crater, also called the Decorah impact structure, is a possible impact crater located on the east side of the city of Decorah in Iowa, United States. It is thought to have been caused by a meteor about 200 metres (660 ft) wide which struck during the Middle Ordovician Period, circa 470 million years ago.
The DNR was created by the 71st General Assembly in 1986 under Terry E. Branstad, member of the Republican Party of Iowa, by combining four previous state agencies: Water, Air, and Waste Management; parts of the Iowa Energy Policy Council; the Iowa Conservation Commission; and the Iowa Geological Survey Organization. [2]
Aquifer mapping: The Iowa Geological Survey will receive $250,000 to map and assess the conditions of the state's underground aquifers, including measuring the volume of groundwater available in ...
Samuel Calvin (February 2, 1840 – April 17, 1911) was Iowa's first systematic geologist, helping to make the first bedrock and landform maps of Iowa, as well as leading geological research throughout the state. He was born in Scotland, attended Lenox College (now defunct) in Hopkinton, Iowa, where he later taught.
From 1959 to 1967, he was an assistant professor, associate professor, and chair of the Department of Geological Sciences at University of California, Riverside. From 1986 to 1990, Eaton served as President of Iowa State University. [2] On March 24, 1994, Dr. Gordon P. Eaton became the 12th Director of the U.S. Geological Survey.