The Birkhoff Basin

The Birkhoff Basin covered most of the northern part of this region with its ejecta at an early time. Yet an even earlier and larger feature, the Coulomb-Sarton Basin, underlies Birkhoff's ejecta.

The ancient floor of Birkhoff (Figure 10.1) records the subsequent history of several nearby craters: Sommerfield, Rowland, Stebbins, and Carnot.

Birkhoff is small for a basin, only about 10% larger in diameter than the conventional boundary between large craters and basins. There is a faint inner ring, 150 km in diameter. If there were outer rings, they have been obliterated by the surrounding large craters.

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