Living Reference Work Entry

Encyclopedia of Planetary Landforms

pp 1-6

Date: Latest Version

Chaotic Crater Floor (Mars)

  • Jarmo KorteniemiAffiliated withEarth and Space Physics, Department of Physics, University of Oulu Email author 
  • , Henrik HargitaiAffiliated withPlanetary Science Research Group, Eötvös Loránd University, Institute of Geography and Earth Sciences


Intracrater occurrence of chaotic terrain; a crater interior morphology.


Chaotic floor crater (CF); Collapsed crater (CC, Rodriguez et al. 2005).

A type of modified crater

A type of chaotic terrain (Mars)


Knobs and irregular mesas that occur in groups or as isolated features (van Kan Parker et al. 2010) inside martian craters (Figs. 1, 2, 3, and 4). Their extent is limited to (1) the inner margin of the crater rim or (2) a circular moat if no rim is present. Craters exhibiting chaotic floor are typical starting points of small and medium size outflow channels and occur in close proximity of chaotic terrains and fractured floor craters (Korteniemi et al. 2006*). Some collapsed floor craters have no apparent outlets.
Fig. 1

Chaotic landscape in Margaritifer Terra. (a) Aram Chaos impact crater at 2.8°N, 338.9°E. The crater contains layered sediments that were laid down in a temporary lacustrine environment (Glotch and Christensen 2005). (b) An 50-km-diameter crater ...

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