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    Bring down the moon dating

    The familiar face of the Moon contains dark splotches, the maria.

    But when you have topographic data and gravity data, you can make maps that cause hidden basins to leap out at you, like they do in this map of lunar crustal thickness.

    Often, these previously hidden basins are named by mentioning two craters or other features that occur on their edges -- things like Freundlich-Sharonov and South Pole-Aitken. So I am hereby making one, based on a new paper that's in press in the by Caleb Fassett, Jim Head, and another five coauthors: "Lunar impact basins: Stratigraphy, sequence and ages from superposed impact crater populations measured from Lunar Orbiter Laser Altimeter (LOLA) data." The paper contains a table that tells us the relative ages of many of these basins -- which ones came first and which ones came later.

    Basin names are in caps if they are in caps on the map above, to help you locate them.

    Some of them are classical names that Moon fans should recognize, things like Imbrium and Crisium and Orientale. Well, now that we've identified where the Moon's big basins are located, we can start delving into the history of the Moon.

    Other names are unfamiliar; these are the basins that were not obvious until we got topography and gravity data. Which one happened first, and which one happened later? What order the lunar basins formed in is a question I have a lot when looking at these global maps of the Moon, and I hadn't found an online resource for it.

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