Supplemental Material: Runoff required to drive postimpact gully development on the walls of Meteor Crater (Arizona, USA)

Figure S1: Geologic map of Shoemaker (1960) that was recolored by Kring (2007) and has been georeferenced to compare with our geomorphic mapping to highlight the correspondence of the debris-flow levees and snouts with material mapped as Pleistocene alluvium. Figure S2: Highly fractured and broken bedrock wall above gully 0. Figure S3: (A) 0.5 m contours draped over shaded relief image of gully 0 to show our definition of gully head area (blue region) and length (black line), (B) long profiles of the floor of the gully (black line in A) vs. unincised talus/breccia (red line in A), where, on average, gully channels tend to be more concave up than their surrounding unincised talus slopes, and (C) cross section of the gully channel (dashed line in A), highlighting its inner steep walls and U-shape. Figure S4: The location and ID of the individual gully alcoves. Figure S5: (A) Example of a line of individual boulders comprising an older levee at gully 16, and (B) corresponding topographic map, with 0.25 cm contours, showing that the boulders are visible within the LiDAR DEM.