DISCUSSION OF AN ANOMALOUS BOULDER AND ITS POSSIBLE ORIGIN IN CHIPPEWA COUNTY, WISCONSIN

A boulder of sedimentary origin was unearthed in topsoil surrounded by sand in the NW ¼ of the SE ¼, Sec. 27, T 28 N, R 8 W Lake Wissota quadrangle in Chippewa County, Wisconsin. The complete description of the boulder will be included along with information from local geologic resources and field work in an attempt to determine its origin. Two possible origins to be discussed include glacial or as part of a fractured Cambrian bedrock. Data to be included will be stratigraphy based off well logs, local outcrop descriptions, and sand descriptions from well logs. The Cambrian bedrock in the study area is Mt. Simon sandstone which is fine to coarse grained, light brown to yellow quartz, white to green siltstone and shale, thinly to thickly bedded, sandstone displays cross beds and parting lineations; bedrock is exposed at surface. This area was glaciated between 30,000 to 300,000 years ago between the Illinoian to pre-late Wisconsin.