Table 1.

Coordinates, attributes, and boulder and layer measurements for images shown in Figs. 1–3.

Figure	Lat (deg)	Lon (deg)	Diameter of boulder (m)	Layer thickness, fragment diameter, or crack width (cm)	Pixel scale (cm/px)
1 a	−18	257	1 (cliff height)	38.8 ± 32.6 (std = 18.6)	6.3
1 b	1	10	10.7	12.8 ± 18.9 (std = 4.0)	3.9
1 c	2.4	213.7	0.73	5.9 ± 5.6 (std = 1.6)	0.9
1 d	−53	168	17.5	4.7 ± 3.7 (std = 5.5)	6.8
1 e	11	307	11.6	56.3 ± 46.4 (std = 30.5)	6.3
1 f	5.5	258	8	22.4 ± 26.4 (std = 9.7))	4.6
2 a	12	357	22.2	140 ± 8 (average at arrows)	3.8
2 b	−12	219	14.5	360 ± 8	3.9
2 c	68	117	24	640 ± 13	6.6
2 d	−9	260	21.6	42 ± 6	6.1
2 e	25	190	13.6	54 ± 5	4.7
2 f	−9	207.5	7.8	17 ± 5	4.8
3 a	−60	348	34	–	3.8
3 b	26.5	193	6.2, 4.3	–	4.7
3 c	5	93	18.4	–	3.9
3 d	1.9	249	12	–	4.7

See “Methods” section for additional image data.