The appearance and weathering characteristics of many volcanic structures imply that they have a recent age.
Argon-argon dating has yielded an imprecise date of 58,000 ± 35,000 years ago for the Henrie Knolls lava flows.
On the Miller Knoll flows, surface exposure dating has yielded ages of 38,000 - 36,000 years ago for the middle member and of 34,000 ± 4,000 and 32,000 ± 3,000 for two other flows which are likely of the same age.
The middle member is overlaid by the Dry Valley flow which is also younger than the other two flows.
The precise date of the last eruption is not known but eight cinder cones in the volcanic field appear to be less than 10,000 years old.
The Southern Paiute settled into the region after 1,100 AD and their legends may contain references to lava flows.

Aside from volcanism, landsliding, aeolian, alluvial fan and floodplain sedimentation took place in the area, beavers built beaver dams on watercourses and peat accumulated at several sites.
During the Pleistocene, the Bull Lake glaciation and the Pinedale glaciation took place on the Markagunt Plateau and eroded and buried some lava flows.
The appearance and weathering characteristics of many volcanic structures imply that they have a recent age. Argon-argon dating has yielded an imprecise date of 58,000 ± 35,000 years ago for the Henrie Knolls lava flows. On the Miller Knoll flows, surface exposure dating has yielded ages of 38,000 - 36,000 years ago for the middle member and of 34,000 ± 4,000 and 32,000 ± 3,000 for two other flows which are likely of the same age. The middle member is overlaid by the Dry Valley flow which is also younger than the other two flows. The precise date of the last eruption is not known but eight cinder cones in the volcanic field appear to be less than 10,000 years old. The Southern Paiute settled into the region after 1,100 AD and their legends may contain references to lava flows.
Aside from volcanism, landsliding, aeolian, alluvial fan and floodplain sedimentation took place in the area, beavers built beaver dams on watercourses and peat accumulated at several sites. During the Pleistocene, the Bull Lake glaciation and the Pinedale glaciation took place on the Markagunt Plateau and eroded and buried some lava flows.
Markagunt Plateau