Getting data out of 2 lists


I have 2 things which are different lists. I would like to get a third list to display which would act as an audit log. Basically, I want to get Created Date, and Created By from both lists and then fill a field stating from which list the action came.

So it could look like something
time 1, User1, A
time 2, User2, B
time 3, User1, A
time 4, User, B