Despite its modest summit elevation, a small glacier exists high on the western slopes just below the rim of the summit crater.
A few historical eruptions of Carlisle have been recorded, but its proximity to several other neighboring volcanoes means that there has been some confusion in the older records as to which of the volcanoes was erupting. As the area is extremely remote, distant observations of volcanic plumes cannot be verified for certain.
Map showing volcanoes of Alaska. The mark is set at the location of Mount Carlisle.