Eratosthenian
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The Eratosthenian period in the lunar geologic timescale runs from 3.2 billion years ago to 1.1 billion years ago. It is named after the crater Eratosthenes, which displays characteristics typical of craters of this age, including a surface that is not significantly eroded by subsequent impacts, but which also does not possess a ray system. The massive basaltic volcanism of the Imbrian period tapered off and ceased during this long span of lunar time. The youngest lunar lava flows identified from orbital images are tentatively placed near the end of this period.
Key facts
- Geologic timespan.name
- Eratosthenian
- Geologic timespan.manual_color
- rgb(60.0, 213.0, 185.0)
- Geologic timespan.top_bar
- Lunar
- Geologic timespan.time_start
- 3200
- Geologic timespan.time_end
- 1100
- Geologic timespan.timeline
- Lunar periods
- Geologic timespan.celestial_body
- moon
- Geologic timespan.timescales_used
- Lunar Geologic Timescale
- Geologic timespan.chrono_unit
- Period
via Wikipedia infobox
Wikidata facts
- Part of
- lunar geologic timescale
- Named after
- Eratosthenes
- Followed by
- Copernican period
- Follows
- Late Imbrian
Show 2 more facts
- end time
- 1100000000
- start time
- 3200000000
Sources (1)
via Wikidata · CC0
~1 min read
Encyclopedic overview
2 sectionsContents
- Examples
- References
The Eratosthenian period in the lunar geologic timescale runs from 3.2 billion years ago to 1.1 billion years ago. It is named after the crater Eratosthenes, which displays characteristics typical of craters of this age, including a surface that is not significantly eroded by subsequent impacts, but which also does not possess a ray system. The massive basaltic volcanism of the Imbrian period tapered off and ceased during this long span of lunar time. The youngest lunar lava flows identified from orbital images are tentatively placed near the end of this period.
Its equivalent on Earth consists of most of the Mesoarchean and Neoarchean eras (Archean eon), Paleoproterozoic and Mesoproterozoic eras (Proterozoic eon).
Excerpted from Wikipedia’s “Eratosthenian” article, available under the CC BY-SA 4.0 licence.