Business Description Wisconsin Geological Society is located in Milwaukee, Wisconsin. This organization primarily operates in the Geological Consultant business / industry within the Services, Not Elsewhere Classified sector. This organization has been operating for approximately 3 years. Wisconsin Geological Society is estimated to generate $25,908 in annual revenues, and employs approximately 1 people at this single location.

Founded in 1936, WGS offers a variety of ways to increase understanding of our planet. The purpose of WGS is to create an interest in the study of geology; to provide the means for the development of knowledge in geology; and to disseminate information concerning all phases of geology.

WGS is a member of the Midwest Federation of Mineralogical and Geological Studies (MWF) which is a part of the American Federation of Mineralogical Societies (AFMS). WGS is a proud recipient of the MWF All American Club Gold Medal award in 2014.


Wisconsin has a diversity of mineral occurrences. Glaciers covered most of the state during the Pleistocene. The glacial drift contains a variety of jumbled materials, including drift copper, diamonds, flour gold, and, most notably, Lake Superior agates. Despite the glacial cover, many bedrock outcrops occur in the state. The bedrock structure is essentially a gentle arch cored by Precambrian rocks. Proterozoic carbonate rocks form the edge of the arch. Vugs in these rocks yield interesting crystallized minerals, such as millerite, fluorite, calcite and marcasite. In the southwestern portion of the state (Iowa, Lafayette and Grant counties) these rocks host classic Mississippi Valley-type lead-zinc deposits. The state mineral, galena, and state mascot, the badger, refer to the main ore and the nineteenth century miners. Toward the center of the state is a broad swath underlain by Cambrian sandstones, worked currently for “frac sand”. The bedrock in the northwestern part of the state is dominated by a continuation of the 1,100 million year old Midcontinent Rift from Michigan’s famous Keweenaw Peninsula. Although lacking in the bonanza copper deposits of Michigan, these rocks do contain similar minerals, most notably in Douglas County. The central part of the state contains granites and metamorphic rocks. Wisconsin’s state rock, red granite, comes from pits in this region. Some granitic rocks, notably in Marathon County, host interesting complex pegmatites. Across central Wisconsin is a 1,800 million year old volcanic belt that contains large massive sulfide deposits. Of these, the Flambeau Mine in Rusk County, produced many excellent mineral specimens. In the northeastern part of the state, Proterozoic banded iron formation of the Gogebic Range produced excellent specimens, particularly from the Montreal Mine in Iron County. Wisconsin State Fossil:
The Wisconsin Geological Society proposed a state fossil in 1985 to encourage interest in our geological heritage. The trilobite (pronounced "TRY-low-bite") is an extinct marine arthropod that was common in the warm, shallow salt sea that periodically covered Wisconsin hundreds of millions of years ago.