During the summer of 1936 a well was drilled for a municipal water supply at Larchwood, Lyon County. The location is in the extreme northwestern corner of the state, being three miles south of Minnesota and eight miles east of South Dakota. Sioux quartzite is exposed less than seven miles to the northwest. The total depth of the well is 560 feet, which includes 324 feet of glacial material and a complete section of the known upper Cretaceous of western Iowa. The Cretaceous beds are classified as Carlile, Greenhorn, Graneros and Upper Dakota sandstone, the latter being the water producing zone.
Proceedings of the Iowa Academy of Science
©1937 Iowa Academy of Science, Inc.
Tester, A. C.
"New Sub-Surface Data from Lyon County, Northwest Iowa,"
Proceedings of the Iowa Academy of Science, 44(1), 134-134.
Available at: https://scholarworks.uni.edu/pias/vol44/iss1/36