Difference between revisions of "June 10, 2009"
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| − | <em>USGS Geologic Atlas of the Moon, eastern map now available at [mailto:tychocrater@yahoo.com Chuck Wood]</em><br /> | + | <em>USGS Geologic Atlas of the Moon, eastern map now available at [http://www.lpi.usra.edu/resources/mapcatalog/usgs/I948/ LPI Lunar Maps Collection]</em><br /> |
| + | <br /> | ||
| + | Is this the most colorful map of the Moon ever made? It is one of the relics of the era of Apollo. <br /> | ||
| + | In the early 60s the US Geological Survey started investigating the geologic history of the Moon <br /> | ||
| + | by mapping the relative positions of ejecta from each crater. Survey mappers have identified five <br /> | ||
| + | different [http://the-moon.wikispaces.com/Stratigraphy eras] of lunar history, denoted on these maps by vibrant colors. Yellow, as used to map <br /> | ||
| + | Langrenus at upper left, represents the newest or Copernican craters. Hamilton,mapped as pea <br /> | ||
| + | green at bottom center, is the next youngest age, Eratosthenian. In shades of blue (Petavius and <br /> | ||
| + | Humboldt) are craters of Imbrian age - they formed during the period of massive mare basalt <br /> | ||
| + | eruptions about 3.5 billion years ago. The oranges (Vendelinus) are materials formed at the time <br /> | ||
| + | of the Nectaris Basin, and the browns are the oldest features, called Pre-Nectarian. Since these <br /> | ||
| + | maps were made there have been a few changes of classifications (Langrenus is now considered <br /> | ||
| + | to be Eratosthenian), but the basic system is still used widely. So when you observe the Moon, see <br /> | ||
| + | if you can glimpse these stratigraphic colors.<br /> | ||
| + | <br /> | ||
| + | <em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br /> | ||
<br /> | <br /> | ||
<strong>Related Links</strong><br /> | <strong>Related Links</strong><br /> | ||
Revision as of 20:41, 1 January 2015
Color of History
USGS Geologic Atlas of the Moon, eastern map now available at LPI Lunar Maps Collection
Is this the most colorful map of the Moon ever made? It is one of the relics of the era of Apollo.
In the early 60s the US Geological Survey started investigating the geologic history of the Moon
by mapping the relative positions of ejecta from each crater. Survey mappers have identified five
different eras of lunar history, denoted on these maps by vibrant colors. Yellow, as used to map
Langrenus at upper left, represents the newest or Copernican craters. Hamilton,mapped as pea
green at bottom center, is the next youngest age, Eratosthenian. In shades of blue (Petavius and
Humboldt) are craters of Imbrian age - they formed during the period of massive mare basalt
eruptions about 3.5 billion years ago. The oranges (Vendelinus) are materials formed at the time
of the Nectaris Basin, and the browns are the oldest features, called Pre-Nectarian. Since these
maps were made there have been a few changes of classifications (Langrenus is now considered
to be Eratosthenian), but the basic system is still used widely. So when you observe the Moon, see
if you can glimpse these stratigraphic colors.
Chuck Wood
Related Links
Rükl plate 39
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