[Dabdklwu]

Not to supplant Element's erudition, but it's basically DN II and DN III. DN I (Suttas 1-13) is the earlier stratum. At best, DN II + III will be combinatorial - the Mahaparinibbana Sutta is a prime example, combining very old stuff (Buddha's last words, for example) with late additions (Ananda's failure to ask the Buddha to live forever, for example).

The Mahanidana Sutta, referred to earlier, is from DN II.