This eruption has produced a large pyroclastic deposit that also covers the fissure. In addition to this activity, a caldera north of the catena has darkened since July 1999 when it was last imaged. See my notes on the Tvashtar from I25 for more information . These observations were meant to detect changes since I25 and to get stereo coverage over some areas. Zal Montes South is a two lobed mountain with a thin sectoin connecting the two.
Ridges cover the east facing slope of the mountain and steep cliffs line the western side.
The east slope is covered in long, N-S trending slopes. A lava flow runs along the base of the northern part of the cliff and to a volcano southwest of the northern lobe. This cliff may be associated with the mountains formation. Red material streams from this cliff indicating that the mountain may still be forming. The red material is believed to be S3 or S4.