| Basis for focus area |
Focus areas shows the areal extent of the Baraboo, Waterloo, Sioux, and Barron Quartzites, where Paleoproterozoic weathering older than 1.7 Ga may be preserved as in situ regolith at the unconformity. |
| Identified resources |
Unknown. |
| Production |
Unknown. |
| Status |
Unknown. |
| Estimated resources |
Unknown. |
| Geologic maps |
Horton and others (2017), scale 1:500,000; sporadic 1:24,000 scale geologic mapping. |
| Geophysical data |
Adequate aeromagnetic coverage in Minnesota, inadequate in Wisconsin and SD; inadequate aeroradiometric coverage. |
| Favorable rocks and structures |
Paleoproterozoic paleoweather profile beneath mature quartzite units. |
| Deposits |
No data. |
| Evidence from mineral occurrences |
No data. |
| Geochemical evidence |
Potential for chemically extractable REE. |
| Geophysical evidence |
No data. |
| Evidence from other sources |
In-situ paleoweathering profiles preserved between older Precambrian and Paleoproterozoic rocks and younger Paleoproterozoic mature quartzites. |
| Comments |
Regolith recognized from sparse outcrop and drilling. |
| Cover thickness and description |
Quartzites are exposed; paleoweathering horizon preserved beneath quartzites. |
| Authors |
Laurel G. Woodruff, Suzanne W. Nicholson, Esther K. Stewart. |
| New data needs |
New mapping. |
| Geologic mapping and modeling needs |
Surficial mapping at 1:24:000 scale. |
| Geophysical survey and modeling needs |
None. |
| Digital elevation data needs |
Lidar inadequate. |
