Basin Groups refers to 9 subdivisions of the lunar Pre-Nectarian geologic period. It is the second era of the Hadean
Read more about Basin Groups: Definition, Relationship To Earth's Geologic Time Scale
Famous quotes containing the word groups:
“And seniors grow tomorrow
From the juniors today,
And even swimming groups can fade,
Games mistresses turn grey.”
—Philip Larkin (1922–1986)