HIGHWOOD MOUNTAINS Latitude and Longitude:
The Highwood Mountains are an island range (sub-range of the Rockies entirely surrounded by prairie) which cover approximately 4,659 km² (1,799 sq mi) in north central Montana in the U.S., east of Great Falls and Benton Lake National Wildlife Refuge, at the northern end of the Lewis and Clark National Forest.  The mountains were included in Highwood Mountains National Forest until 1908, when the unit became part of Lewis and Clark National Forest.
The area has volcanic origins and is rich in potash. Many of the extrusive rocks and some of the dike rocks contain abundant phenocrysts of a clear analcime that appears to be primary. Pseudoleucite is an abundant constituent of many of the igneous rocks.  The Shonkin Sag, a famous glacial meltwater channel, borders the Highwood Mountains to the north.
HIGHWOOD MOUNTAINS INFORMATION
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