http://www.psrd.hawaii.edu/Mar09/magmaOceanSolidification.html

Time to Solidify an Ocean of MagmaTime to Solidify an Ocean of Magma

The Moon melted when it formed.How long did it take this ocean of magma to solidify?

http://www.psrd.hawaii.edu/Mar09/magmaOceanSolidification.html

Time to Solidify an Ocean of MagmaTime to Solidify an Ocean of Magma

Aftermath of the giant impact:Rapid, hot formation of the Moon.

Magma ocean cooling began soon after lunar formation.Measurements of Sm-Nd and W isotopes indicate lunar formation occurred 4.517 billion years ago.

http://www.psrd.hawaii.edu/Mar09/magmaOceanSolidification.html

Time to Solidify an Ocean of MagmaTime to Solidify an Ocean of Magma

Rock 72215 collected at Apollo 17 site.

A single zircon in 72215 shows a range of ages. The oldest cluster at 4.417 billion years.This is 100 million years after Moon magma ocean began to crystallize.