Examples of morphologic features on comet 67P as imaged by the OSIRIS narrow-angle camera (Keller et al. 2007). (a) Hathor cliff with boulders accumulating at the airfall-covered foot of the cliff. The consolidated tough material of the cliff supports an escarpment height of about 900 m. The largest boulders are approximately 50 m across. (b) Pre-collapse Aswan plateau and cliff site with smooth airfall deposits, consolidated wall material, and debris with boulders at the cliff foot (center left). The shadowed pit in the top left of the image is approximately 200 m across. (c) Foot of a collapsed debris field populated with boulders up to 10–15 m across. (d) Debris deposits superimposing an apparently smooth region of small airfall particles. Bare consolidated and airfall-covered terrains alternate spatially. The boulder deposit in the upper left and the airfall-covered plateau in the center of the image are each approximately 500 m wide. Figure tags: (a) NAC_ 2014-09-29T08.52.08.332Z_ID30_1397549001_F41, (b) NAC_2014-09-29T16.10.04.817Z_ID30_1397549000_F16, (c) NAC_2016-08-03T07.28.34.758Z_ID30_1397549000_F22, (d) NAC_2014-09-13T23.29.22.367Z_ID30_1397549001_F41. Credits: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA.