The regeneration of the rock has been sufficient to efface most of the original structures and to replace the former minerals more-or-less completely by new ones.
It presented a view wonderfully beautiful and brilliant; the effect was little short of magic, and it made an impression which no time will ever efface from my mind.
The central area of the cephalon (or glabella) is elongated, reaching the anterior border, but its features are strongly effaced, almost showing no furrows.