Conceptual model of predation concentration accumulates showing how gastric masses or regurgitates may contribute to concentrating belemnite rostra or other cephalopod elements (note magnified arm hook). From Doyle and Macdonald (1993): https://doi.org/10.1111/j.1502-3931.1993.tb01513.x
The Early Jurassic elasmobranch Hybodus hauffianus with its stomach clogged by belemnite rostra (SMNS 10062) from the Toarcian Posidonia Shale of Holzmaden, Germany. See: https://doi.org/10.1186/s13358-021-00225-z
In the #predation concentration model, #bromalites = fossilized remains of material sources from the digestive system of predators (regurgitates, gastric masses) may play an important role in concentrating belemnite rostra. The Hybodus #shark specimen shows this quite nicely: doi.org/10.1186/s133...
