Because they don't have a standard planispiral shape, they are known as heteromorphic ammonites. Pictured above is Scaphites whitfieldi, where you can see tubercles, the bases of spines, across its ...

Dr. Chris Shelton and student Kolby Dooling unearthed a rare, well-preserved ammonite fossil at a site in Oklahoma, and it wasn’t an ordinary fossil. This particular find shimmered with the ...