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Arch Rock (Mackinac Island)

Geology of MichiganHistoric district contributing properties in MichiganLandforms of Mackinac County, MichiganMackinac Island State ParkNRHP infobox with nocat
National Register of Historic Places in Mackinac County, MichiganNatural arches of MichiganNatural features on the National Register of Historic Places in MichiganProtected areas of Mackinac County, MichiganUse mdy dates from August 2023
Arch Rock, Mackinac Island, 7.26.2014
Arch Rock, Mackinac Island, 7.26.2014

Arch Rock is a geologic formation on Mackinac Island in Michigan. It is a natural limestone arch formed during the Nipissing post-glacial period, a period of high Lake Huron levels following the end of the Wisconsin glaciation. To this day Arch Rock stands on the Lake Huron shoreline 146 feet (45 m) above the water. Limestone breccia is not an ideal material for natural bridges, and this type of formation is quite rare in the North American Great Lakes region. The Native Americans saw Arch Rock as a place of numinous power, and told many stories and legends about it.Euro-Americans did not share many of the taboos of their Native predecessors, and treated Arch Rock as a curiosity to be admired. One early chronicler was Alexis de Tocqueville who wrote of the "Giant's Arch" "of extraordinary shape" during his visit in August, 1831.Its presence was a major element in the decisions to create Mackinac National Park in 1875 and its successor, Mackinac Island State Park, in 1895. Arch Rock has been a part of the State Park ever since. Today Arch Rock is a focus of Mackinac Island tourism, and is seen by many visitors to the Island. Several trails and paved roads, including the aptly named Arch Rock Road and Arch Rock Bicycle Trail, lead to the formation.

Excerpt from the Wikipedia article Arch Rock (Mackinac Island) (License: CC BY-SA 3.0, Authors, Images).

Arch Rock (Mackinac Island)
Tranquil Bluff Trail,

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N 45.857791 ° E -84.607267 °
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Tranquil Bluff Trail
49757
Michigan, United States
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Arch Rock, Mackinac Island, 7.26.2014
Arch Rock, Mackinac Island, 7.26.2014
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Fort Holmes
Fort Holmes

Fort Holmes is a fortified earthen redoubt located on the highest point of Mackinac Island. Originally built in 1814 by British forces during the War of 1812, the redoubt was improved by that army throughout the course of the war (1812–1814) to help defend the adjacent Fort Mackinac from a possible attack by the U.S. Army.The British named the redoubt Fort George and reinforced it with cannon, a blockhouse, and a magazine for gunpowder and other munitions. However, Fort Holmes never functioned as an independent military fortification. It was always a dependent outpost of nearby Fort Mackinac.When United States armed forces reoccupied Mackinac Island in 1815 under the terms of the Treaty of Ghent, they took possession of Fort George. They surveyed and measured their prize, which they renamed Fort Holmes in honor of Major Andrew Holmes, a casualty in the 1814 Battle of Mackinac Island. However, the American army soon abandoned Fort Holmes. The earthworks and buildings of the former redoubt slowly eroded and disappeared over the course of more than a century.In 1936, as part of its mission to provide employment through public works projects during the nationwide Great Depression, the Works Progress Administration used the original 1817 American survey to rebuild Fort Holmes to its War of 1812 appearance. As of 1984, however, most of the reconstructed buildings of Fort Holmes had again disappeared, except for the redoubt's earthen walls.In 2015 the Mackinac Island State Park completed a second reconstruction of Fort Holmes that resumes the appearance that the redoubt had in 1817. The blockhouse includes interpretive panels inside, and is open in the summer. Many visitors come to the fort site for a view of the Straits of Mackinac, much of which is visible from this lookout point approximately 320 feet (98 m) above the surface of Lake Huron and 890 feet (271 m) above sea level. The redoubt and blockhouse can be rented for special occasions.

Skull Cave (Mackinac Island)
Skull Cave (Mackinac Island)

Skull Cave is a small and shallow cave on the central heights of Mackinac Island in Michigan, United States. The cave was carved during the Algonquin post-glacial period by the waters of Lake Algonquin, a swollen meltwater ancestor of today's Lake Huron.Skull Cave is primarily of interest for its historical associations. It is believed to have been used as an inhumation site by Native Americans of the Straits of Mackinac area in the 18th century.While in active use as a site for human remains, the cave was also used as a refuge in 1763 by fur trader Alexander Henry, a survivor of the capture of Fort Michilimackinac by Native Americans during Pontiac's War. In his "Memoirs," Henry recalled a night spent as a refugee in the bone-strewn cavern.Henry recalled his ordeal as follows: On going into the cave, of which the entrance was nearly ten feet wide, I found the further end to be rounded in its shape, like that of an oven, but with a further aperture, too small, however, to be explored. After thus looking around me, I broke small branches from the trees and spread them for a bed, then wrapped myself in my blanket and slept till day-break. On awaking, I felt myself incommoded by some object upon which I lay, and, removing it, found it to be a bone. This I supposed to be that of a deer, or some other animal, and what might very naturally be looked for in the place in which I was; but when daylight visited my chamber I discovered, with some feelings of horror, that I was lying on nothing less than a heap of human bones and skulls, which covered the floor! Skull Cave is contained within Mackinac Island State Park. It is located 0.4 miles (0.6 km) north of Fort Mackinac in the island's interior. It was designated as a Michigan Historic Site on January 12, 1959, and granted state historical marker #L0004.