1. Centre for Cross-disciplinary Chalk Research (C3); Department of Geosciences and Natural Resource Management; University of Copenhagen; Øster Voldgade 10 DK-1350 Copenhagen K Denmark
2. Pacific E&P USA Inc.; 5555 San Felipe St, Suite 1250 Houston Texas 77056 USA
3. School of Ocean and Earth Science; National Oceanography Centre; University of Southampton; Southampton Hampshire SO14 3ZH UK
4. Centre for Cross-disciplinary Chalk Research (C3); Natural History Museum of Denmark; Øster Voldgade 5-7 DK-1350 Copenhagen K Denmark