[2][4] Western Khorisar (elevation 3736 m) and Didi-Nepiskalo (3694 m) are the highest summits close to the crest of the Greater Caucasus.

[2][4] Nikoloz Skhirtladze first studied the volcanoes and divided the volcanism into glacial and postglacial stages.

A second phase 137–70ka with large scale effusive activity included the "Pyramidal Peak" Volcano which dammed local rivers with lava flows.

The third phase less than 30ka with evidence that it continued into the Holocene formed Eastern Khorisa and Ploskaya Vershina.

Activity of East Khorisar Volcano spans both stages and created lava flows in the Terek river valley, at the end involving the collapse of the northern flank of its crater.