Affiliation: | 1. Department of Geoscience, University of Calgary, 2500 University Drive, Calgary, Alberta, Canada T2N 1N4;2. ARC Resources Ltd., Suite 2100, 440 2nd Ave. SW, Calgary, Alberta, Canada T2P 5E9;3. Geological Survey of Canada, 3303-33rd St. NW, Calgary, Alberta, Canada T2L 2A7;4. Department of Earth and Environmental Sciences, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, Canada N2L 3G1 |