Musannaf Ibn Abi Shayba 1:782

Abu Bakr narrated to us, he said: Isa ibn Yunus narrated to us, from al-Awza’i, who said: I asked al-Zuhri about a man who is struck by janabah (major ritual impurity) and he has with him water that is sufficient for wudu (minor ablution). He said: "He performs tayammum (dry ablution)." And ‘Abdah ibn Abi Lubabah said: "He performs wudu and he performs tayammum."