Reminds me of a mass fish-kill. There are a lots of fossil sites like this (with no soft fleshy parts preserved of course and are more primitive species from older time periods). Our German hosts carved up some of these and gave them as gifts to the attendees when we traveled to Southern Germany for a field trip. I don't really know what this software does and why it has such a complicated node system. Perhaps I'll check on it when I get some time. Thanks for the post.