Deposit between the start of the intentional dump and fill layers of 22010 and 22012, and the top of the geological material 22014. 22013 seems like a possible earthen floor on which the material in 22010 and 22012 was dumped. Ceramic evidence is rare and not helpful in dating, but the presenece of a little pottery, bone, charcoal, and some iron slag inclusions may represent the earliest occupation level of room b.