Show Summary Details

Quick Reference

Small hills or knobs on a planetary surface (used only in the plural form; sing. collis). The name is not a geological term, but is used in the nomenclature of individual features, for example Oxia Colles on Mars.

Subjects: Astronomy and Astrophysics.

Reference entries

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.