Problematica is the name given to fossils that you just can't classify. You could have the oldest rock...the best specimens...and just have no idea how they relate to other organisms, extant or extinct. This painting was made with mixed media, including grout and stain. Some people really like the colors; others don't. I happen to like the colors, which are unique to my work. (I made it in the fall of 2004, shortly after the New Mexico dig, which resulted in many blue and tan paintings)...As usual, I would like to reproduce the general idea but I just can't do it. I wonder what other colors I could try to do it in.