Girvanolithes Fossil
Terreneuvian Orthothecid (Hyolitha) Digestive Tracts from Northern Montagne Noire, France; Taphonomic, Ontogenetic and Phylogenetic Implications by Lea Devaere, Sebastien Clausen, J. Javier Alvaro, John S. Peel, and Daniel Vacharduu.diva-portal.org/smash/get/diva2:711342/FULLTEXT01.pdf
