The Science of Fossil Poop and Puke

Hunt, A. P., & Lucas, S. G. (2021). The ichnology of vertebrate consumption: Dentalites, gastroliths and bromalites (Vol. 87). New Mexico Museum of Natural History and Science.

Freimuth, W. J., Varricchio, D. J., Brannick, A. L., Weaver, L. N., & Wilson Mantilla, G. P. (2021). Mammal‐bearing gastric pellets potentially attributable to Troodon formosus at the Cretaceous Egg Mountain locality, Two Medicine Formation, Montana, USA. Palaeontology, 64(5), 699-725.

https://ichnology.ku.edu/invertebrate_traces/tfimages/rusophycus.html

https://www.trilobites.info/trace.htm 

Lucas, S. G., Fillmore, D. L., & Simpson, E. L. (2010). Amphibian body impressions from the Mississippian of Pennsylvania, USA. Ichnos, 17(3), 172-176.

Jiang, S., Wang, X., Zheng, X., Cheng, X., Wang, X., Wei, G., & Kellner, A. W. (2022). Two emetolite-pterosaur associations from the Late Jurassic of China: showing the first evidence for antiperistalsis in pterosaurs. Philosophical Transactions of the Royal Society B, 377(1847), 20210043.

Lockley MG, Meyer C. Dinosaur tracks and other fossil footprints of Europe. New York: Columbia University Press; 2000. [A picture of Hermunderichnus is in here]

Walter H, Werneburg R. Über Liegesupren (Cubichnia) aquatischer Tetrapoden (?Diplocauliden, Nectridea) aus den Rotteroder Schichten (Rotliegendes, Thüringer Wald/DDR). Freib Forschungsheft. 1988;419: 96–106. [this is a source for Hermunderichnus, which is hard to find]