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Figure 3. A: Upper unit and upper and middle members of the lower unit. Thin layer capping the upper unit commonly exhibits 4–5-m-diameter polygonal fractures in map view (inset), including these from 4 km to the south. B: Middle and lower members (above and below dashed line, respectively) of lower unit. C: Idealized stratigraphic section for Holden crater. Sedimentary section in C is 150 m thick, though the unknown thickness of lower unit, lower member, makes this a minimum estimate. Stratigraphic positions of units in A and B are indicated in C by connecting lines. North is up in A and down in B. High Resolution Imaging Science Experiment (HiRISE) image PSP_001468_1535_RED was used for A and B and image PSP_002154_1468 was used for inset in A (image scale of both is 26 cm/pixel).

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