Earth and Planetary Sciences ETDs
Publication Date
5-2-1972
Abstract
The map-area is located along the northwest flank of the Big Belt Mountains, Montana and includes the Eldorado thrust which marks the zone of frontal breakthrough where thrusts of the Cordilleran foldbelt are in contact with the Rocky Mountain foreland. Sedimentary rocks range in age from Precambrian to Cretaceous. Two formations of the Precambrian Belt Series, the Greyson Shale (Oldest) and Spokane Shale are present. Overlaying the Spokane Shale are five formations of the Cambrian; Flathead Quartzite (oldest), Wolsey Shale, Meagher Limestone, Park Shale, and Pilgrim Limestone. Their total aggregate thickness is about 1200 feet.
Degree Name
Earth and Planetary Sciences
Level of Degree
Masters
Department Name
Department of Earth and Planetary Sciences
First Committee Member (Chair)
Lee A. Woodward
Second Committee Member
J. Paul Fitzsimmons
Third Committee Member
Albert Masakiyo Kudo
Fourth Committee Member
Charles T. Siemene
Language
English
Document Type
Thesis
Recommended Citation
Durham, Jon A.. "Structural geology of the northern part of the east Helena Quadrangle, Lewis and Clark county, Montana.." (1972). https://digitalrepository.unm.edu/eps_etds/204
Plate 2
durham_tectonic_map.tif (562228 kB)
Tectonic map
durham_tectonic_map_50.jpg (26720 kB)
Tectonic map 2
