Nonesuch Shale
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The Nonesuch Shale is a Proterozoic geologic formation that outcrops in Michigan and Wisconsin, United States, but has been found by drill holes to extend in the subsurface as far southwest as Iowa.
Native copper replaces cross-bedded sedimentary rocks of the Nonesuch Shale, White Pine mine, Upper Peninsula of Michigan
Potholes in Nonesuch shale, Presque Isle River, Porcupine Mountains State Park, Upper Peninsula of Michigan
Midcontinent Rift System
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The Midcontinent Rift System or Keweenawan Rift is a 2,000 km long geological rift in the center of the North American continent and south-central part of the North American plate. It formed when the
Nonesuch Shale
…Freda make up the Oronto Group. The Nonesuch is Middle Proterozoic, with an estimated age of approximately 1.1 billion years. It was deposited in the Midcontinent Rift. The Nonesuch beds contain common organic carbon and pyrite. The Nonesuch Formation has been a major source of copper, and is considered a prospective…
Rift rocks are exposed in the buff-colored areas around Lake Superior (black). The buff area on the north margin is the Lake Nipigon area.
Volcanic strata protrude at Isle Royale and the Keweenaw Peninsula
Sleeping Giant in Ontario
Eroded volcanic strata at Isle Royale in Michigan