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The Gates of the Mountains Wilderness is located in the U.S. state of Montana.Created by an act of Congress in 1964, the wilderness is managed by Helena National Forest.A day use campground near the Gates of the Mountains, Meriwether Picnic site, is named in honor of Meriwether Lewis.
The geology of Montana includes thick sequences of Paleozoic, Mesozoic and Cenozoic sedimentary rocks overlying ancient Archean and Proterozoic crystalline basement rock. . Eastern Montana has considerable oil and gas resources, while the uplifted Rocky Mountains in the west, which resulted from the Laramide orogeny and other tectonic events have locations with met
The Crazy Mountains experience two distinct igneous settings that include mildly saturated or heavily saturated alkalic rocks. Both of these igneous series derive from mantle sources with mafic characteristics. These rocks are not a result from partial melting but rather derived from distinct source regions. Highwood Mountain, Montana
Shonkinite is an intrusive igneous rock found in few places in the world. It is unique in having low silica, feldspathoid minerals, and large blocky crystals of black augite. It makes up much of the hard dark grey rock comprising certain mountains and buttes in Montana that are remnants of laccoliths and stocks, such as the Highwood mountains.
The rocks serve as an important aquifer as well as an oil reservoir in places. The Madison and its equivalent strata extend from the Black Hills of western South Dakota to western Montana and eastern Idaho , and from the Canada–United States border to western Colorado and the Grand Canyon of Arizona .
The volcanic Elkhorn Mountains are a large mass of forested lava associated with the batholith. The batholith is composed of at least seven, and possibly as many as 14, discrete rock masses called plutons, which had formed beneath the Earth's surface during a period of magma intrusion about 73 to 78 million years ago (Late Cretaceous time). [1]
Mann Gulch is a gulch in the Gates of the Mountains Wilderness of the upper Missouri River, 24 miles (39 km) north-northeast of Helena, Montana, in southeastern Lewis and Clark County. It is on the east side of the Missouri River and approximately 9 miles (14 km) east of Interstate 15 (I-15), between Helena and Wolf Creek.
Ore grade is about 2.5 ounces of Pd-Pt per ton of rock, with a Pd-Pt ratio of about 3:1. The Stillwater igneous complex is a large layered mafic intrusion (LMI) located in southern Montana in Stillwater, Sweet Grass and Park Counties. The complex is exposed across 30 miles (48 km) of the north flank of the Beartooth Mountain Range.