[6] In 2025, President Joe Biden established Sáttítla Highlands National Monument to protect the area from development.

The distribution of late Pleistocene vents, mostly concentrated along the rim, suggests that ring faults already existed when most of the andesite erupted.

Late Holocene andesitic to rhyolitic lavas were derived by fractionation, assimilation, and mixing from high alumina basalt parental magma.

Medicine Lake Volcano began to grow about one million years ago in Pleistocene time, following the eruption of a large volume of tholeiitic high-alumina basalt.

Basalt is mostly absent at higher elevation, where andesite dominates and rhyolite and small volumes of dacite are present.

Fitch cites reports that a light ash fall that occurred in 1910 may have come from a small eruption at Glass Mountain.

Ten additional small domes of Glass Mountain rhyolite and rhyodacite lava lie on a N25degreesW trend to the north and one to the south.

A radiocarbon dating age of 885±40 years before present (1990) was obtained on a dead incense-cedar tree without limbs or bark that is preserved in the edge of one of the distal tongues of the flow.

The tephra deposits that precede the flow and domes may be somewhat older but are constrained to be less than about 1,050 years before present (1990) by the Little Glass Mountain and Lassen Peak data.