State | Wisconsin |
---|---|
Name | Rhyolite |
Geologic age | Early Proterozoic |
Lithologic constituents |
Major
Sedimentary > Clastic > Mixed-clastic (Tuffaceous)Ash-flow tuffs and interbedded volcaniclastic sedimentary rocks and cogenetic granite (unit Xga) exposed as inliers in southern Wisconsin. In central Wisconsin pink, flow-banded rhyolite and chert-cemented breccia inferred to be 1760 Ma.
Igneous > Volcanic > Felsic-volcanic > Rhyolite (Pyroclastic-ash flow)Ash-flow tuffs and interbedded volcaniclastic sedimentary rocks and cogenetic granite (unit Xga) exposed as inliers in southern Wisconsin. In central Wisconsin pink, flow-banded rhyolite and chert-cemented breccia inferred to be 1760 Ma.
Minor
Igneous > Plutonic > Granitic > Granite (Stock or pipe)Ash-flow tuffs and interbedded volcaniclastic sedimentary rocks and cogenetic granite (unit Xga) exposed as inliers in southern Wisconsin. In central Wisconsin pink, flow-banded rhyolite and chert-cemented breccia inferred to be 1760 Ma.
|
Comments | Marshfield terrane |
References | |
NGMDB product | |
Counties | Columbia - Green Lake - Marquette - Portage - Sauk - Waupaca - Waushara |