[1
] School of Geography, Earth and Environmental Sciences, University of Birmingham,
Edgbaston, Birmingham B15 2TT, UK
[2
] Institut für Geologie und Paläontologie, Universität Münster, 48149 Münster, Germany
[3
] Geological Survey of Northern Ireland, Dundonald House, Upper Newtownards Road, Belfast
BT4 3SB, UK
[4
] Oxford University Museum of Natural History, Parks Road, Oxford OX1 3PW, UK