Causes and consequences of widespread ocean anoxia in the past / Niels A.G.M. van HelmondBolide impact and long- and short term environmental change across the cretaceous-paleogene boundary / Johannes VellekoopThe Messinian salinity crisis: a Paratethyan perspective = De Messiniaanse zoutcrisis: een Paratethys' perspectief / Arjen Grothe