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Acknowledgments
We thank Cabot Oil & Gas Corp. for permission to publish, as well as GSI Environmental Inc. for financial support of staff participation. Thanks to Dr. Emily C. Mercurio for LiDAR and National Hydrography Dataset manipulation and mapping. We appreciate the insightful suggestions and comments of the numerous GSI and Cabot reviewers that greatly improved the article. The LiDAR bare-earth Digital Elevation Model used in the study had 3-ft pixel resolution and was a proprietary data set. Horizontal accuracy of the LiDAR point cloud (from which the bare-earth DEM was generated) is 45 cm and vertical accuracy is 30 cm. Gray areas on Figs. 6, 7, and 9 representing the δ13C and δ2H values of methane of microbial and thermogenic origin are based on plots and data presented in Coleman et al., 1993, and Schoell, 1980.
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