HRA Gray & Pape, LLC. (August 1, 2003). Appendix A. Figures on the Landscape: Effigy Mounds Historic Resource Study (Report). National Park Service. Retrieved December 21, 2016.
HRA Gray & Pape, LLC. (August 1, 2003). Chapter 3: Environment. Figures on the Landscape: Effigy Mounds Historic Resource Study (Report). National Park Service. Retrieved December 21, 2016.
"Documenting Native American Monuments at Effigy Mounds National Monument". nps.gov. August 2010. Archived from the original on August 5, 2010. Retrieved November 14, 2023. See Lidar image of Marching Bears Group as Ursa Major and navigational aid for Polaris at winter solstice. Vikings used Ursa Major, also known as Wain and used as Thor's Hammer in the myth Karl Wagen, as a navigational aid and as a calendar to determine northern lights (aurora borealis), which Vikings thought were signs of doom to come or a battle, at the winter solstice when the "handle" of Little Dipper or the "tail" of Ursa Major points southward in the sky and reveals the location of the North Star (Polaris). Ursa Major is also known as Arthur’s Wain in which the name Arthur goes back to Artos which is Proto-Celtic for bear. Bear and also hero/warrior in Old Irish was the word art. Proto-Inuit, who are sometimes referred to as Skrælingjar, also had contact with vikings, who had reached the shores of Canada in the 11th century as part of Norse colonization of North America.
"Documenting Native American Monuments at Effigy Mounds National Monument". nps.gov. August 2010. Archived from the original on August 5, 2010. Retrieved November 14, 2023. See Lidar image of Marching Bears Group as Ursa Major and navigational aid for Polaris at winter solstice. Vikings used Ursa Major, also known as Wain and used as Thor's Hammer in the myth Karl Wagen, as a navigational aid and as a calendar to determine northern lights (aurora borealis), which Vikings thought were signs of doom to come or a battle, at the winter solstice when the "handle" of Little Dipper or the "tail" of Ursa Major points southward in the sky and reveals the location of the North Star (Polaris). Ursa Major is also known as Arthur’s Wain in which the name Arthur goes back to Artos which is Proto-Celtic for bear. Bear and also hero/warrior in Old Irish was the word art. Proto-Inuit, who are sometimes referred to as Skrælingjar, also had contact with vikings, who had reached the shores of Canada in the 11th century as part of Norse colonization of North America.
