Aspen Butte is a steep-sided

shield volcano A shield volcano is a type of volcano named for its low profile, resembling a warrior's shield lying on the ground. It is formed by the eruption of highly fluid (low viscosity) lava, which travels farther and forms thinner flows than the more v ...

in the Cascade Range of southern

Oregon Oregon () is a state in the Pacific Northwest region of the Western United States. The Columbia River delineates much of Oregon's northern boundary with Washington, while the Snake River delineates much of its eastern boundary with Idah ...

. It is located south of

Pelican Butte Pelican Butte is a steep-sided dormant shield volcano in the Cascade Range of southern Oregon. It is located due south of Crater Lake and northeast of Mount McLoughlin, and rises over directly above the shore of Upper Klamath Lake. Ice age ...

and southeast of

Mount McLoughlin Mount McLoughlin is a dormant steep-sided stratovolcano, or composite volcano, in the Cascade Range of southern Oregon and within the United States Sky Lakes Wilderness. It is one of the volcanic peaks in the Cascade Volcanic Arc, within the Hi ...

. It rises over above the nearby shore of

Upper Klamath Lake Upper Klamath Lake (sometimes called Klamath Lake) (Klamath: ?ews, "lake" ) is a large, shallow freshwater lake east of the Cascade Range in south-central Oregon in the United States. The largest body of fresh water by surface area in Oregon, it ...

Ice Age An ice age is a long period of reduction in the temperature of Earth's surface and atmosphere, resulting in the presence or expansion of continental and polar ice sheets and alpine glaciers. Earth's climate alternates between ice ages and gre ...

glaciers A glacier (; ) is a persistent body of dense ice that is constantly moving under its own weight. A glacier forms where the accumulation of snow exceeds its ablation over many years, often centuries. It acquires distinguishing features, such a ...

carved three large

cirques A (; from the Latin word ') is an amphitheatre-like valley formed by glacial erosion. Alternative names for this landform are corrie (from Scottish Gaelic , meaning a pot or cauldron) and (; ). A cirque may also be a similarly shaped landf ...

into the north and northeast flanks of the mountain removing most of the original summit area including any evidence of a crater. The summit is now the high point along the curving ridge which bounds the southern edge of the cirques above steep cliffs. Aspen Butte is the highest of four overlapping shield volcanoes within the

Mountain Lakes Wilderness The Mountain Lakes Wilderness is a wilderness area located in the Fremont–Winema National Forest in the southern Cascade Range of Oregon in the United States. It surrounds a cluster of four overlapping shield volcanoes, the highest of which ...

all of which have been carved to varying degrees by glaciers. The other volcanoes are

Mount Harriman Mount is often used as part of the name of specific mountains, e.g. Mount Everest. Mount or Mounts may also refer to: Places * Mount, Cornwall, a village in Warleggan parish, England * Mount, Perranzabuloe, a hamlet in Perranzabuloe parish ...

, Crater Mountain and

Greylock Mountain Mount Greylock is a mountain located in the northwest corner of Massachusetts and is the highest point in the state. Its summit is in the western part of the town of Adams (near its border with Williamstown) in Berkshire County. Geologically ...

. Another peak,

Mount Carmine Mount is often used as part of the name of specific mountains, e.g. Mount Everest. Mount or Mounts may also refer to: Places * Mount, Cornwall, a village in Warleggan parish, England * Mount, Perranzabuloe, a hamlet in Perranzabuloe parish, Co ...

, which lies just over to the north of Aspen Butte, is actually not a separate volcano but the highest remnant of the north flank of the Aspen Butte volcano separated from it by two glacial cirques. Little Aspen Butte, a

satellite cone A parasitic cone (also adventive cone or satellite cone) is the cone-shaped accumulation of volcanic material not part of the central vent of a volcano. It forms from eruptions from fractures on the flank of the volcano. These fractures occur ...

, rises on the southern flanks of the main volcano separated from it by a pass.

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See also