Encyclopedia of Planetary Landforms

2015 Edition
| Editors: Henrik Hargitai, Ákos Kereszturi

Double-Layer Ejecta

  • Nadine G. Barlow
Reference work entry
DOI: https://doi.org/10.1007/978-1-4614-3134-3_137

Definition

Impact crater ejecta morphology displaying two continuous deposits.

Category

A type of  layered ejecta.

Synonyms

Description/Structural Units

Double-layer ejecta (DLE) craters have been identified on Mars and Ganymede. The inner layer of the DLE morphology is thicker and terminates in a concave scarp. The outer layer is thinner and more extensive, typically terminating in a distal ridge (rampart) (Barlow et al. 2000; Schenk and Ridolfi 2002; Boyce and Mouginis-Mark 2006; Boyce et al. 2010). Martian DLE craters display a strong radial texture of grooves and ridges extending from the crater rim to the edge of the outer layer (Fig. 1). A topographic moat typically occurs just beyond the crater rim. Secondary craters extending beyond the outer ejecta layer are seldom seen (Boyce and Mouginis-Mark 2006).
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References

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.Department of Physics and AstronomyNorthern Arizona UniversityFlagstaffUSA