Which Came First, the Yardang or the Platy Flow?
Which Came First, the Yardang or the Platy Flow?
ESP_034255_1840  Science Theme: Geologic Contacts/Stratigraphy
One of the great strengths of HiRISE is that its high resolution can help resolve interesting questions: in this observation, is the platy flow material younger than the yardang-forming material?

A “yardang” is a streamlined hill made of loose rock and bedrock that’s been shaped by wind erosion. The volcanic platy flow material in the same area should be older than the yardang material. The purpose of this observation is to figure out whether the platy flow materials trap or catch (embay) the yardang-forming material, or are just covered by that material.

Written by: HiRISE Science Team (narration: Tre Gibbs)  (12 February 2014)

This is a stereo pair with ESP_025473_1840.
Acquisition date
16 November 2013

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
273.3 km (169.9 miles)

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25 cm/pixel and North is up

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43°, with the Sun about 47° above the horizon

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50.4°, Northern Spring

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Sub-solar azimuth:  34.1°
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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.