1. Department of Geology, Saint Mary’s University, Halifax, NS B3H 3C3, Canada
2. Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139
3. Nova Scotia Department of Natural Resources and Renewables, Halifax, NS B3J 3J9, Canada
4. Applied Petroleum Technology (Canada) Ltd., Calgary, AB T3A 2M3, Canada
5. Natural Resources Canada, Geological Survey of Canada-Atlantic, Dartmouth, NS B2Y 4A2, Canada
6. Geomicrobiology Group, Department of Biological Sciences, University of Calgary, Calgary, AB T2N 1N4, Canada