Layered Mound in a Crater
NASA/JPL/UArizona
Layered Mound in a Crater
PSP_003655_1885  Science Theme: Sedimentary/Layering Processes
This image shows a portion of a mound partly filling an impact crater. The impact crater is a little more than 60 kilometers (37 miles) across, and the central mound about half that, extending well beyond the area shown here.

Large impact craters typically have central peaks which surge upwards in the last stage of crater formation. However, mounds like this represent a different process: sedimentary infill of the crater after its formation.

At this site, the mound appears to be layered. Step-forming layers crop out throughout the center of the image. This indicates that the mound material was deposited in a series of events, likely the same process repeating many times. Many processes could form layers like this, including aeolian (wind) deposition, volcanic ash, or lake sedimentation. Unfortunately, fine details of the layers are obscured by dust which covers most of the mound. Avalanches in this dust layer are responsible for the many small dark streaks in the image.

However the material in the mound formed, it was once even more extensive, perhaps entirely filling the crater. Wind erosion has caused the elongated, fluted shapes called yardangs.



Written by: Colin Dundas  (8 August 2007)
 
Acquisition date
08 May 2007

Local Mars time
15:23

Latitude (centered)
8.549°

Longitude (East)
21.151°

Spacecraft altitude
274.7 km (170.7 miles)

Original image scale range
27.4 cm/pixel (with 1 x 1 binning) so objects ~82 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection
Equirectangular

Emission angle
1.4°

Phase angle
59.0°

Solar incidence angle
58°, with the Sun about 32° above the horizon

Solar longitude
233.8°, Northern Autumn

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  335.2°
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POSTSCRIPT
NASA’s Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, Calif., manages the Mars Reconnaissance Orbiter for NASA’s Science Mission Directorate, Washington. The HiRISE camera was built by Ball Aerospace and Technology Corporation and is operated by the University of Arizona.