Links
Problematica
MacGabhann B. A. (2012): A Solution to Darwin's Dilemma: Differential Taphonomy of Ediacaran and Palaeozoic Non-Mineralised Discoidal Fossils
Earth and Ocean Sciences, School of Natural Sciences, NUI Galway Alessandrello A., Bracchi G. (2003): Eldonia berbera n. sp., a new species of the enigmatic genus Eldonia Walcott, 1911 from the Rawtheyan (Upper Ordovician) of Anti-Atlas (Erfoud, Tafilalt, Morocco)
Atti della Società italiana di scienze naturali e del museo civico di storia naturale di Milano, 144, 337-358 Mergl M. (1984): Marcusodictyon, an encrusting bryozoan from the Lower Ordovician (Tremadocian) of Bohemia
Věstník Českého geologického ústavu 59(3), 171–172 B. A. MacGabhann & J. Murray (2010): Non-mineralised discoidal fossils from the Ordovician Bardahessiagh Formation, Co. Tyrone, Ireland
Irish Journal of Earth Sciences 28, 1–12