Ammonite PaleoEcology

The behavior and lifestyle of ammonites is not well understood. Heteromorph ammonites (examples at left) in particular are intriguing because their odd morphologies are unlike any living creatures, and many have distinct morphologic changes midway through their life. I'm trying to apply stable isotopic techniques to better understand how these creatures behaved. Currently I'm focusing on museum specimens from the Cretaceous of the United States, but have collected some my own field examples if possible.