The visual manifestation of the recent Hale-Bopp comet reminds us how telling are those rare objects which suddenly flare in the sky. One can suppose ancient people living by natural light were more compellingly struck by the sight of comets and supernovae, and understandably researchers seek images of them in the shapes of rock-art motifs. An absolute dating contradicts that supposition in respect of a presumed image of the visible supernova of AD 1054.
1997-14 Plasma extraction and AMS 14C dating of rock paintings
1998-22 Effect of Water on Lower Pecos River Rock Paintings in Texas
This research was made possible through Grant MT-2255-6-NC-14 from the National Center for Preservation Technology and Training (NCPTT).