Sinuous Ridges Near Aeolis Mensae
NASA/JPL/University of Arizona
Sinuous Ridges Near Aeolis Mensae
PSP_002279_1735  Science Theme: Sedimentary/Layering Processes
twitter  •  facebook  •  tumblr

WALLPAPER
800
1024
1152
1280
1440
1600
1920
2048
2560

HIFLYER
PDF (11 x 17)


This observation covers part of a fan-shaped deposit of material in the Aeolis Mensae region of Mars.

The dominant surface texture is a series of parallel linear ridges. In addition, there are several sinuous, flat-topped ridges. The sinuous ridges do not follow the trend of the linear ridges, and various intersecting relations are observed.

The southernmost sinuous features in this image are partially buried by linear ridge material, while in the northern part of the image they appear to stand above it. This could indicate that the linear unit has been more eroded in the north than the south, but may also be due to a more complex geological history in which different sinuous ridges formed at different times. In the northeast part of the image one sinuous ridge appears superposed on another, supporting this hypothesis.

The linear ridges may be yardangs. Yardangs form when material is eroded by wind, producing elongated features aligned with the prevailing wind. Many of the ridges expose layers and appear to have broken into boulders. Layering indicates multiple episodes or pulses of deposition, while the occurrence of boulders shows that the material has been consolidated to some degree.

The sinuous ridges could be former stream channels outcropping in inverted relief, where a formerly low-lying feature is now relatively high-standing. This occurs when the stream channel is more resistant to erosion that the surroundings, either due to cementation by water or to the presence of large rocks which are not easily eroded.

In this case, the sinuous ridges contain few boulders resolvable by HiRISE, generally appearing uniform and smooth. They also contain fractures which in places cut across the entire ridge. Both of these observations are consistent with cementation of former channel floors.

Written by: Colin Dundas  (31 January 2007)

This is a stereo pair with PSP_002002_1735.
 
Acquisition date
21 January 2007

Local Mars time:
15:51

Latitude (centered)
-6.241°

Longitude (East)
151.436°

Spacecraft altitude
302.6 km (189.1 miles)

Original image scale range
from 30.3 cm/pixel (with 1 x 1 binning) to 60.5 cm/pixel (with 2 x 2 binning)

Map projected scale
25 cm/pixel and North is up

Map projection
Equirectangular

Emission angle:
29.3°

Phase angle:
31.2°

Solar incidence angle
59°, with the Sun about 31° above the horizon

Solar longitude
170.1°, Northern Summer

For non-map projected images
North azimuth:  96°
Sub-solar azimuth:  16.4°
JPEG
Black and white
map projected  non-map

IRB color
map projected  non-map

Merged IRB
map projected

Merged RGB
map projected

RGB color
non-map projected

JP2
Black and white
map-projected   (1670MB)

IRB color
map-projected   (857MB)

JP2 EXTRAS
Black and white
map-projected  (853MB)
non-map           (650MB)

IRB color
map projected  (284MB)
non-map           (512MB)

Merged IRB
map projected  (407MB)

Merged RGB
map-projected  (416MB)

RGB color
non map           (497MB)
ANAGLYPHS
Map-projected, reduced-resolution
Full resolution JP2 download
Anaglyph details page

ADDITIONAL INFORMATION
B&W label
Color label
Merged IRB label
Merged RGB label
EDR products
HiView

NB
IRB: infrared-red-blue
RGB: red-green-blue
About color products (PDF)

Black & white is 5 km across; enhanced color about 1 km
For scale, use JPEG/JP2 black & white map-projected images

USAGE POLICY
All of the images produced by HiRISE and accessible on this site are within the public domain: there are no restrictions on their usage by anyone in the public, including news or science organizations. We do ask for a credit line where possible:
NASA/JPL/University of Arizona

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.