U.S. Geological Survey, 345 Middlefield Rd., MS 977, Menlo Park, CA 94025 United States ; ExxonMobil Exploration Company, P.O. Box 4778, Houston, TX 77210-4778 United States
U.S. Geological Survey, 384 Woods Hole Rd., Woods Hole, MA 02543 United States
U.S. Geological Survey, 345 Middlefield Rd., MS 977, Menlo Park, CA 94025 United States
U.S. Geological Survey, 345 Middlefield Rd., MS 977, Menlo Park, CA 94025 United States