not sure if this is Goniatite or not, but I bought several of these from a Morrocan dealer many years ago only cause they were all stuck onto a concretion. I took this one and polished it up. It was covered in a very very hard 'crust'. I dont remember just how long it took me but Im sure it was over 10 hours. I remember I didnt want to do any more! But it came out purty good. Wish i had a before picture? I can see that it needs even more work, but not sure if Im gunna get around to that?
RB