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Bailey, J.V.; Corsetti, F.A.; Bottjer, D.J.; Marenco, K.N. (June 2006). "Microbially-Mediated Environmental Influences on Metazoan Colonization of Matground Ecosystems: Evidence from the Lower Cambrian Harkless Formation". PALAIOS. 21 (3): 215. Bibcode:2006Palai..21..215B. doi:10.2110/palo.2005-p05-51e. S2CID130690224.
Seilacher, Adolf; Luis A. Buatoisb; M. Gabriela Mángano (2005-10-07). "Trace fossils in the Ediacaran–Cambrian transition: Behavioral diversification, ecological turnover and environmental shift". Palaeogeography, Palaeoclimatology, Palaeoecology. 227 (4): 323–356. Bibcode:2005PPP...227..323S. doi:10.1016/j.palaeo.2005.06.003.
Dzik, J (2007), "The Verdun Syndrome: simultaneous origin of protective armour and infaunal shelters at the Precambrian–Cambrian transition", in Vickers-Rich, Patricia; Komarower, Patricia (eds.), The Rise and Fall of the Ediacaran Biota, Special publications, vol. 286, London: Geological Society, pp. 405–414, doi:10.1144/SP286.30, ISBN978-1-86239-233-5, OCLC156823511