Fig. 3. Map of the study area, with underlying hexagonal grid, defined by the boundaries of the Marcellus Shale formation within New York State. N = 19,318 hexagons. Excluded hexagons (N = 5286, dark red) fall into one or more of six categories of high sensitivity to energy development (see Table 2). Green hexagons fall into the upper 50% of conservation value (higher vulnerability) rankings, ordered by town. Remaining hexagons (yellow) fall into the lower 50% of conservation value (lower vulnerability) rankings (see Methods: Selection criteria for conservation vulnerability models). Source: New York State Department of Environmental Conservation, Marcellus Shale formation 2009 production, http://www.dec.ny.gov/energy/46381.html.