Branched Features on the Floor of Antoniadi Crater
NASA/JPL/University of Arizona

Branched Features on the Floor of Antoniadi Crater
ESP_012725_2015  Science Theme: Fluvial Processes
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The dark branched features in the floor of Antoniadi Crater look like giant ferns, or fern casts. However, these ferns would be several miles in size and are composed of rough rocky materials.

A more likely hypothesis is that this represents a channel network that now stands in inverted relief. The channels may have been lined or filled by indurated materials, making the channel fill more resistant to erosion by the wind than surrounding materials. After probably billions of years of wind erosion the resistant channels are now relatively high-standing. The material between the branched ridges has a fracture pattern and color similar to deposits elsewhere on Mars that are known to be rich in hydrated minerals such as clays.

The inverted channels have short, stubby branches characteristic of formation by groundwater sapping. Spring water seeps into the channels and undercuts overlying layers which collapse, so the channels grow headward. These images tell the story of an ancient wet environment on Mars, where life could have been possible. Ancient Martian life was most likely to consist of microorganisms rather than giant tree ferns.

Written by: Alfred McEwen   (29 April 2009)

This is a stereo pair with ESP_012435_2015.



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Acquisition date:14 April 2009 Local Mars time: 3:09 PM
Latitude (centered):21.353° Longitude (East):61.275°
Range to target site:300.2 km (187.6 miles)Original image scale range:30.0 cm/pixel (with 1 x 1 binning) so objects ~90 cm across are resolved
Map projected scale:25 cm/pixel and North is upMap projection:Equirectangular
Emission angle:21.5° Phase angle:82.4°
Solar incidence angle:64°, with the Sun about 26° above the horizon Solar longitude:246.3°, Northern Autumn
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North azimuth:97° Sub-solar azimuth:323.0°
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