Alot of ammonoids died in an ancient sea that is now the desert of the western US. I have gathered some of the evidence and posted it to my website. Anasibirites Beds More information about ammonoids can be found in Phil's article Ammonites Have a look at the evidence and help me try to figure out why they all got where they are. There are alot of pictures so unless you have a fast internet connection it may take awhile. Have Fun!