Was tycho crater formed before or after mare nubium?

Tycho Crater was formed after Mare Nubium. Mare Nubium, a large basaltic plain on the Moon, was created during the early lunar volcanic activity, while Tycho, a prominent impact crater, formed around 1080 million years ago, which is significantly later than the formation of Mare Nubium. Tycho's distinctive rays and features are a result of its relatively younger impact event.