Machel Higgins, The Pennsylvania State University, Geological Sciences, University Park, PA, United States, Peter La Femina, The Pennsylvania State University, Department of Geosciences, University Park, PA, United States, John C Weber, Grand Valley State Univ, Allendale, MI, United States, Halldor Geirsson, University of Iceland, Faculty of Earth Sciences, Reykjavik, Iceland and Graham Alexander Ryan, University of the West Indies, Kingston, Jamaica