Material is Cannal Coal. It looks red, b/c it was covered in red ochre. Yes, the horns are carved out from the Cannal Coal.
Nobody knows what the "Monster" is supposed to represent. I have read it referenced as a water monster, but I have no idea where that comes from. Another reference I remember is that it is a "Hopewell Griffin" w/o wings.
The piece was made by the Ohio Hopewell Culture around the time of Jesus. The piece is somewhere in the Peabody Museum in Cambridge, Mass. A friend of mine saw it years ago, but I have heard it can't be seen anymore unless you are a research archaeologist. Don't you just love museums and their attitude towards the public? Funny how they forget who supports them.
When this mound was excavated in the early 1900's, silver, gold, meteorites, mica, sharks teeth, and a huge laundry list of exotic items were found. It can be argued that Turner was right at the top of the important Hopewell cultural centers. Today, the site is completely destroyed mostly by a mining operation. I played in a softball league for years that sits on top of part of the site.
Regards,
Jon Dickinson.