Wind Carved Rock
NASA/JPL/University of Arizona
Wind Carved Rock
ESP_046504_1785  Science Theme: Rocks and Regolith

HICLIP

1080p (MP4)
720p (MP4)
Listen to the text

WALLPAPER

800  1024
1152  1280
1440  1600
1920  2048
2560  2880
4K

HIFLYER

PDF, 11 x 17 in

HISLIDES

PowerPoint
Keynote
PDF
The distinctively fluted surface and elongated hills in this image in Medusae Fossae are caused by wind erosion of a soft fine-grained rock. Called yardangs, these features are aligned with the prevailing wind direction. This wind direction would have dominated for a very long time to carve these large-scale features into the exposed rock we see today.

Yardangs not only reveal the strength and direction of historic winds, but also reveal something of the host rock itself. Close inspection by HiRISE shows an absence of boulders or rubble, especially along steep yardang cliffs and buttresses. The absence of rubble and the scale of the yardangs tells us that the host rock consists only of weakly cemented fine granules in tens of meters or more thick deposits. Such deposits could have come from extended settling of volcanic ash, atmospheric dust, or accumulations of wind deposited fine sands. After a time these deposits became cemented and cohesive, illustrated by the high standing relief and exposed cliffs.

Written by: Michael Mellon (audio: Tre Gibbs)   (19 October 2016)

Click to share this post on Twitter Click to share this post on Facebook Click to share this post on Google+ Click to share this post on Tumblr
 
Acquisition date
28 June 2016

Local Mars time:
15:25

Latitude (centered)
-1.488°

Longitude (East)
196.359°

Range to target site
270.7 km (169.2 miles)

Original image scale range
54.2 cm/pixel (with 2 x 2 binning) so objects ~162 cm across are resolved

Map projected scale
50 cm/pixel and North is up

Map projection
Equirectangular

Emission angle:
0.0°

Phase angle:
51.4°

Solar incidence angle
51°, with the Sun about 39° above the horizon

Solar longitude
176.3°, Northern Summer

North azimuth:
97°

Sub-solar azimuth:
9.4°
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   (193MB)

IRB color
map-projected   (108MB)

JP2 EXTRAS
Black and white
map-projected  (91MB)
non-map           (105MB)

IRB color
map projected  (37MB)
non-map           (111MB)

Merged IRB
map projected  (177MB)

Merged RGB
map-projected  (177MB)

RGB color
non map           (104MB)
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
For information about NASA and agency programs on the Web, visit: http://www.nasa.gov. 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. Lockheed Martin Space Systems is the prime contractor for the project and built the spacecraft. The HiRISE camera was built by Ball Aerospace and Technology Corporation and is operated by the University of Arizona. The image data were processed using the U.S. Geological Survey’s ISIS3 software.