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Updating the planetary time scale: focus on Mars

Ciencias Da Terra

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Abstract

Formal stratigraphic systems have been developed for the surface materials of the Moon, Mars, Mercury, and the Galilean satellite Ganymede. These systems are based on geologic mapping, which establishes relative ages of surfaces delineated by superposition, morphology, impact crater densities, and other relations and features. Referent units selected from the mapping determine time-stratigraphic bases and/or representative materials characteristic of events and periods for definition of chronologic units. Absolute ages of these units in some cases can be estimated using crater size-frequency data. For the Moon, the chronologic units and cratering record are calibrated by radiometric ages measured from samples collected from the lunar surface. Model ages for other cratered planetary surfaces are constructed primarily by estimating cratering rates relative to that of the Moon. Other cratered bodies with estimated surface ages include Venus and the Galilean satellites of Jupiter. New global geologic mapping and crater dating studies of Mars are resulting in more accurate and detailed reconstructions of its geologic history.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Updating the planetary time scale: focus on Mars
Series title:
Ciencias Da Terra
Year Published:
2013
Language:
English
Publisher:
Department of Earth Sciences Lisbon University
Larger Work Type:
Article
Larger Work Subtype:
Journal Article