PIA05624: "Upper Dells" Clues to Watery History
 Target Name:  Mars
 Is a satellite of:  Sol (our sun)
 Mission:  Mars Exploration Rover (MER)
 Spacecraft:  Opportunity
 Instrument:  Microscopic Imager
 Product Size:  3491 x 1909 pixels (w x h)
 Produced By:  JPL
 Full-Res TIFF:  PIA05624.tif (6.651 MB)
 Full-Res JPEG:  PIA05624.jpg (1.417 MB)

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Original Caption Released with Image:

figure 1 for PIA05624
Figure 1

This magnified view from NASA's Mars Exploration Rover Opportunity of a portion of a martian rock called "Upper Dells" shows fine layers (laminae) that are truncated, discordant and at angles to each other. In Figure 1, interpretiveblack lines trace cross-lamination that indicates the sediments that formed the rock were laid down in flowing water; the interpretive blue lines point to boundaries between possible sets of cross-laminae.

This rock, like another called "Last Chance," (see PIA05482) preserves evidence for trough cross-lamination, likely produced when flowing water shaped sinuous ripples in underwater sediment and pushed the ripples to migrate in one direction. The direction of the ancient flow would have been toward or away from the viewer.

Several frames taken with Opportunity's microscopic imager during the rover's 41st sol on Mars (March 5, 2004) are stitched together to make this mosaic view. Eight spherules can be seen embedded in the rock, and one larger pebble sits on the present-day surface of the rock.

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