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Portage Lake Volcanics; Rhyolite at Bergland

Portage Lake Volcanics; Rhyolite at Bergland
StateMichigan
NamePortage Lake Volcanics; Rhyolite at Bergland
Geologic ageMiddle Proterozoic
Original map labelYplr
Primary rock typerhyolite
Secondary rock type
Other rock types
Lithologic constituents
Major
Igneous > Volcanic > Felsic-volcanic > Rhyolite (Flow)rhyolite at Bergland MI, part of the Portage Lake Volcanics
Map references
Cannon, W.F., Kress, T.H., Sutphin, D.M., Morey, G.B., Meints, Joyce, and Barber-Delach, Robert, 1997, Digital Geologic Map and mineral deposits of the Lake Superior Region, Minnesota, Wisconsin, Michigan: USGS Open-File Report 97-455 (version 3, Nov. 1999), on-line only
Unit references
Cannon, W.F., Kress, T.H., Sutphin, D.M., Morey, G.B., Meints, Joyce, and Barber-Delach, Robert, 1997, Digital Geologic Map and mineral deposits of the Lake Superior Region, Minnesota, Wisconsin, Michigan: USGS Open-File Report 97-455 (version 3, Nov. 1999), on-line only
Geographic coverageOntonagon

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