The primary impact may also eject significant numbers of rocks which eventually fall back to make secondary craters.

Some of these are secondary craters from Langrenus, and display an oblong shape.

Fauth is most likely a secondary crater that was created by the formation of Copernicus.

These formed about a billion secondary craters 10 m in size up to 3500 km away from the primary impact.

No obvious secondary craters from Caloris have been recognized on the smooth plains.

If these secondary craters formed from a single, large, nearby impact, then they would have formed at roughly the same instant in time.

A secondary crater now marred the slope of the great crater.

There are also likely to be secondary craters, caused by large blocks of material flung out by the primary impact.

I refer, in particular, to ejecta blankets and to secondary craters.

Some of these secondary craters form sinuous chains in the ejecta.