Haydon, Mort, Thierry Adatte, Gerta Keller, David Bartels, Karl Föllmi, Philipp Steinmann, Zsolt Berner, and E.H. Chellai. (2008) 2008. “Organic Carbon Deposition and Phosphorus Accumulation During Oceanic Anoxic Event 2 in Tarfaya, Morocco”. Cretaceous Research 29 (5-6): 1008-23. doi:10.1016/j.cretres.2008.05.026.