Encyclopedia of Planetary Landforms

2015 Edition
| Editors: Henrik Hargitai, Ákos Kereszturi

Combination Ejecta

Reference work entry
DOI: https://doi.org/10.1007/978-1-4614-3134-3_438

Definition

Impact crater ejecta pattern which displays a layered ejecta morphology close to the crater rim and secondary crater chains beyond the edge of the layered ejecta deposit.

Category

A type of  ejecta, containing both  layered ejecta and  radial ejecta.

Synonyms

Diverse ejecta; MLERSRd;  Radial-lobate ejecta; SLERSRd;  Transitional ejecta

Description

The combination ejecta pattern displays components of both layered (fluidized) and radial (dry) ejecta patterns. There is a layered ejected blanket close to the crater rim, beyond which chains of secondary craters can be seen. The secondary craters appear to extend from beneath the outer edge of the layered ejecta deposit and thus appear to be formed prior to the emplacement of the layered ejecta deposit (Barlow et al. 2000). The layered ejecta part of the combination ejecta pattern is typically either a  single layer ejecta or  multiple layer ejecta morphology. Secondary craters extending beyond the outer layer of the  double...

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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