Great Falls

Basement domain in the Northern Rocky Mountains

Geologic information

Region Northern Rocky Mountains
Crust
Formation age: 1870-1790 Ma
Notes Orogenic events superposed 1.77-1.71 Ga

Geographic extent

Bibliographic references

Kellogg, K.S., Snee, L.W., and Unruh, D.M., 2003, The Mesoproterozoic Beaverhead impact structure and its tectonic setting, Montana-Idaho—40Ar/39Ar and U-Pb isotopic constraints: Journal of Geology, v. 111, p. 639–652; http://www.jstor.org/stable/10.1086/378339.Lemieux, Sophie, Ross, G.M., and Cook, F.A., 2000, Crustal geometry and tectonic evolution of the Archean crystalline basement beneath the southern Alberta Plains, from new seismic reflection and potential-field studies: Canadian Journal of Earth Sciences, v. 37, p 1437–1491.Mueller, P.A., Heatherington, A.L., Kelly, D.M., Wooden, J.L., and Mogk, D.W., 2002, Paleoproterozioc crust within the Great Falls tectonic zone—Implications for the assembly of southern Laurentia: Geology, v. 30, p. 127–130; doi: 10.1130/0091 7613(2002)030<0127:PCWTGF>2.0.CO;2.Mueller, P.A., Burger, H.R., Wooden, J.L., Brady, J.B., Cheney, J.T., Harms, T.A., Heatherington, A.L., and Mogk, D.W., 2005, Paleoproterozoic metamorphism in the northern Wyoming Province—Implications for the assembly of Laurentia: The Journal of Geology, v. 113, p. 169–179.
Vogl, J.J., Foster, D.A., Mueller, P.A., Wooden, J.L., and Mogk, D.W., 2004, Lithology and age of pre-Belt Precambrian basement in the Little Belt Mountains, Montana—Implications for the role of the Great Falls tectonic zone in the Paleoproterozoic assembly of North America: Northwest Geology, v. 33, p. 15–34.
O’Neill, J.M., and Lopez, D., 1985, Character and regional significance of Great Falls tectonic zone, east-central Idaho and west-central Montana: American Association of Petroleum Geologists Bulletin, v. 69, p. 437–447.