Sinuous Ridge Cutting across Geologic Units of the Medusae Fossae Formation
NASA/JPL/UArizona
Sinuous Ridge Cutting across Geologic Units of the Medusae Fossae Formation
ESP_032620_1780  Science Theme: Fluvial Processes
At this location is an exceptionally long sinuous ridge, possibly an inverted fluvial feature, that cuts across newly mapped geologic units of the Medusae Fossae Formation.

In the eastern part of the image, the sinuous ridge appears in a manner that suggests erosion of the surrounding landscape. Interestingly, this fluvial feature has no elevation within and to the west location, indicating that fluvial activity may have occurred within this material before widespread erosion.

With HiRISE resolution, we might be able to have more information on the timing of fluvial activity and its relationship to the history of the Medusa Fossae formation.

Written by: HIRISE Science Team (narration: Tre Gibbs)  (18 September 2013)
 
Acquisition date
12 July 2013

Local Mars time
14:12

Latitude (centered)
-1.836°

Longitude (East)
150.629°

Spacecraft altitude
269.1 km (167.3 miles)

Original image scale range
54.1 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
5.2°

Phase angle
38.4°

Solar incidence angle
33°, with the Sun about 57° above the horizon

Solar longitude
350.2°, Northern Winter

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North azimuth:  97°
Sub-solar azimuth:  1.4°
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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.