Rhyolite from Michigan, USA
USA | |
| Wolff R. G., Huber N. K., (1973 The Copper Harbor Conglomerate (Middle Keweenawan) on Isle Royale, Michigan and its Regional Implications, USGS Paper 754-B |
| Wolff R. G., Huber N. K., (1973 The Copper Harbor Conglomerate (Middle Keweenawan) on Isle Royale, Michigan and its Regional Implications, USGS Paper 754-B |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
Copper Harbor Conglomerate stromatolite outcrops, Copper Harbor, Grant Township, Keweenaw County, Michigan, USA