Michigan geologists describe the Natural Wall as a resistant vertical bed of Jacobsville Sandstone. Non-expert observers have proposed that it is a volcanic dyke, while its block-like and naturally fractured appearance has fueled comparisons with megalithic structures in Peru.
Geologists identify Natural Wall as a vertical sandstone bed
Key facts
- Geologists describe the Natural Wall as a resistant vertical bed of Jacobsville Sandstone.
- The volcanic-dyke hypothesis was proposed by non-expert observers and is not the accepted geological description.
- The formation's block-like and naturally fractured appearance has prompted comparisons with megalithic structures in Peru, but this does not establish that it was constructed.
Sources
Michigan's Great Wall: Is it Man-Made or Not? - 95.3 The Ticketwbckfm.com
“Near the historic town of Laurium, on the Keweenaw Peninsula, there is an enigmatic wall,” said Rademacher. “It is in a deep ravine, is ...
Natural Wallgeo.mtu.edu
A famous geological spot, the Natural wall is a resistant bed of the Jacobsville Sandstone, turned on its side, to near vertical.
Past-E-Mail - Pasty Centralpasty.com
Looks like an exposed dike that has weathered and cracked to fool our eyes into thinking it's a man-made wall? I think dikes are formed when lava fills a ...
A Prehistoric Structure Under Lake Michigan Resembles a Mini ...news.artnet.com
An arrangement of 9000-year-old blocks of granite, 40 feet under the surface of Lake Michigan, resembles a smaller Stonehenge.
The Natural Wall, A Keweenaw wonder - Copper Rangecopperrange.org
The Natural Wall is a vertical bed of resistant trough-bedded sandstone that forms an erosional wall on the south side of the ravine. The Jacobsville Sandstone ...
Features from the Field: Dikes and Sills - EGU Blogsblogs.egu.eu
Dikes (or dykes) are the most efficient way to transport magma upward within the crust. Dikes are intrusions that are generally near-vertical
Dike (geology)en.wikipedia.org
The dike rock is usually more resistant to weathering than the surrounding rock, so that erosion exposes the dike as a natural wall or ridge. It is from these ...
Volcanic Rocks and Associated Landformspubs.usgs.gov
A dike is a place were molten material cooled in a vertical crack. Sills form when molten material squeezes between horizontal layers. An ...
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