The Middle and West Forks of Little Sheep Creek in the southern Tendoy Range have incised valleys across Cenozoic structural features exposing strata that range in age from the Mississippian to the Neoene. Paleozoic strata are 1,349 m thick and belong to the Mission Canyon Limestone, the Big Snowy, Amsden,...
The thesis area consists of 42 square miles located
in Madison and Gallatin counties, Montana, in the southern
part of the Madison Range. The strata exposed in the
area range in age from Precambrian to Quaternary and have
an aggregate thickness of more than 7,600 feet.
The Paleozoic rocks, about...
The Greenstone Mountain area, which includes the Utopia mining
district, is located in the foothills of the Pioneer Range, Beaverhead
County, Montana. Approximately 12, 600 feet of Paleozoic and
Mesozoic sedimentary rocks and an undetermined thickness of Precambrian
sediments and Late Cretaceous igneous rocks are exposed
within the area of...
The Cedar Creek area, consisting of about 30 square miles, is
located on the west flank of the central Madison Range in Madison
County, Montana.
The rocks of the area include carbonates, sandstones, mudstones,
cherts, phosphorite, metamorphic rocks, intrusive igneous
rocks, and unconsolidated sediments and have been divided into 16...
The Rock Creek area consists of 53 square miles located in
the eastern foothills of the Pioneer Mountains, Beaverhead County,
Montana. Approximately 8, 500 feet of late Paleozoic and early
Mesozoic contact-metamorphosed sedimentary rocks and late Mesozoic
sedimentary rocks are exposed in the area of study.
Most of the late...
During the Late Mississippian-Early Pennsylvanian (latest
Chesterian-early Morrowan), a thick sequence of shallow -water
carbonate-clastic sediments, equivalent to the "Amsden" and lower
Quadrant Formations, was deposited in the Snowcrest trough on the
western margin of the northern Rocky Mountain Cordilleran platform
in southwestern Montana. Today this late Chesterian sequence is...
Approximately 18 square miles are included in the study area which lies 17 miles southwest of the town of Dillon, Montana. Strata exposed in the area include metamorphic, sedimentary, and volcanic rocks ranging in age from Precambrian to Recent. The Paleozoic and Mesozoic section
is approximately 8000 feet thick and...
