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The use of 14C in meteorite dating is solely based on its production by cosmic rays (and for terrestrial samples, with its production in the atmosphere).
Only the latter two "extinct" nuclides are used in dating.
Thus, although "extinct", these nuclides are present in meteorites, but produced by a more recent process.
"The idea that Rb-Sr is the most used chronometer for meteorites is largely based on work done 10-30 years ago.
Volcano craters are above the surrounding area on mountaintops while the craters from impacts are below the surrounding area with raised rims.
The craters on all of the moons except Io, Mercury, and most of the ones on Mars are from impacts.