Angular Unconformity in Cerberus Fossae
NASA/JPL/University of Arizona
Angular Unconformity in Cerberus Fossae
PSP_010638_1890  Science Theme: Volcanic Processes


800  1024  
1152  1280  
1440  1600  
1920  2048  
This HiRISE image shows a part of the Cerberus Fossae, a long system of aligned fissures. The Cerberus Fossae were the source of the youngest major volcanic eruption on Mars that covered much of the surrounding area in lava. The region has also seen much other volcanic activity.

The walls of the fissures typically reveal lava layers. At this site, they have cut through an older hill that protrudes above the surrounding plains. The layers within the hill are tilted relative to the overlying rock, which appears to drape the region and runs continuously over the hill and plains.

This tilted contact is known as an angular unconformity. It is most likely that this formed when horizontal layers were tilted by faults before the most recent volcanic eruptions, forming the irregular hills. The hills represent relatively old rock, while the smooth plains and the thin draping cover were formed more recently.

Written by: Colin Dundas   (21 January 2009)

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

 Image Products: All image links are drag & drop for HiView, or click to download
B&W: map projected  non-map

IRB color: map projected  non-map

Merged IRB: map projected

Merged RGB: map projected

RGB color: non-map projected

B&W: map-projected (457MB)

IRB color: map-projected (208MB)
B&W: map-projected  (251MB),
non-map  (250MB)

IRB color: map projected  (113MB)
non-map  (226MB)

Merged IRB: map projected  (448MB)

Merged RGB: map-projected  (415MB)

RGB color: non map-projected  (216MB)
B&W label
Color label
Merged IRB label
Merged RGB label
EDR products

About color products (PDF)
HiView main page

 Observation Toolbox
Acquisition date:02 November 2008 Local Mars time:15:40
Latitude (centered):8.970° Longitude (East):162.873°
Range to target site:275.9 km (172.4 miles)Original image scale range:55.2 cm/pixel (with 2 x 2 binning) so objects ~166 cm across are resolved
Map projected scale:50 cm/pixel and North is upMap projection:Equirectangular
Emission angle:0.1° Phase angle:54.2°
Solar incidence angle:54°, with the Sun about 36° above the horizon Solar longitude:151.3°, Northern Summer

Context map

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: Image: NASA/JPL/University of Arizona
For information about NASA and agency programs on the Web, visit: 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.