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Tractus Fossae

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Title: Tractus Fossae  
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Subject: Fossa (geology), Tharsis quadrangle, Asopus Vallis, Moons of Mars, Apsus Vallis
Publisher: World Heritage Encyclopedia

Tractus Fossae

Tractus Fossae
Tractus Fossae based on THEMIS day-time image
Naming a classical albedo feature name

Tractus Fossae is a trough in the Tharsis quadrangle of Mars, located at 26° north latitude and 101.4° west longitude. It is 390 km (240 mi) long and is named after a classical albedo feature name.[1] The name "Fossae" is used to indicate large troughs when using geographical terminology related to Mars. Troughs, sometimes also called a graben, form when the crust is stretched until it breaks, which forms two breaks with a middle section moving down, leaving steep cliffs along the sides. Sometimes, a line of pits form as materials collapse into a void that forms from the stretching.[2]

Trough in Tractus Fossae caused by faults and resulting collapse of material into faults forming a chain of pits, as seen by Mars Global Surveyor
Tractus Fossae Ringed Pit, as seen by HiRISE. Scale bar is 1000 meters long. 


  1. ^ Mars: Tractus Fossae
  2. ^ Mars Global Surveyor MOC2-620 Release
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