Regurgitalite:
Regurgitalites, or sometimes Regurgitaliths, are the fossilized remains of stomach contents that have been regurgitated by an animal, such as an owl pellet. They are bromalite trace fossils and can be subdivided into ichnotaxa. Regurgitaliths might provide useful information on the diet of the animal, but are difficult to relate to any particular species. [Wikipedia]
Noted in “Prehistoric puke offers clues about ancient sea predators’ diets,” Leo Sands, WaPo:
Scientists were able to determine that the remains were fossilized vomit — rather than a run-of-the-mill fossil — because of how the two crinoid species were so tightly concentrated in a round clump. Milan said the regurgitalite, the scientific name for fossilized vomit, was probably buried under chalk soon after being spewed out, preventing it from being torn apart by other animals on the seafloor.
