Comment on "Athabasca Valles, Mars: A Lava-Draped Channel System"

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Comment on "Athabasca Valles, Mars: A Lava-Draped Channel System" by David P. Page Science Volume 320(5883):1588-1588 June 20, 2008 Published by AAAS

Fig. 1. RMLs and polygons across Athabasca Valles and Amazonis Planitia. RMLs and polygons across Athabasca Valles and Amazonis Planitia. North to top, scale bars 100 m. (A) HiRISE PSP_002292_1875 (28 cm per pixel); two RMLs superposing a small impact crater. (Note undeformed RMLs.) (B) HiRISE PSP_002661_1895 (30 cm per pixel); large RML superposed by an oblique impact crater. (Note destruction of right-hand wall of RML and distension of left-hand wall by high-velocity ejecta.) (C) Context of (A). (D) HiRISE PSP_002371_1890 (28 cm per pixel); impact crater truncated by an RML [same image as shown in figures 3C and 4A in (1)]. (E) Context of (B). Note the regular polygonal pattern of the substrate, which suggests that polygons formed before RMLs (otherwise the distinctive sculpture would not form where RMLs are absent). (F and G) MOC R23-00683 and R14-01144 (3.5 m and 4.7 m per pixel); impact craters superposed by polygonal sculpture cutting rims. (H) MOC S09-02331 (3.19 m per pixel); composite image showing polygonal sculpture superposing impact craters [cf. (E)]. (I) RML from same MOC image (S09-02331), 2 km south of (H) [cf. 1J]. (J) Figure 3 from (1) showing typology of polygons. David P. Page Science 2008;320:1588 Published by AAAS

Fig. 2. Stereo red/green anaglyphs of Fig Fig. 2. Stereo red/green anaglyphs of Fig. 1A, B, and D in Athabasca Valles. Stereo red/green anaglyphs of Fig. 1A, B, and D in Athabasca Valles. (A) PSP_002292_1875 and PSP_002147_1875. (B) PSP_002661_1895 and PSP_003924_1895. (C) PSP_002371_1890 and PSP_001540_1890. Context views directly to right (white boxes). David P. Page Science 2008;320:1588 Published by AAAS