- the Water-Walking
- the Feeding of the 4000
- the Blind Man of Bethsaida
These three pericopes were the only ones written by the original Markan author, i.e. the author responsible for most of the Gospel of Mark as we know it--its overall narrative, its structures, and its characteristic features. Turton simply calls this author "Mark" (though this author was not the editor of the canonical GMk.)
So there was an original version of GMk that featured these pericopes alone, in this order, in this section of the gospel.
We know that Matthew nevertheless used canonical GMk in composing his gospel, because he has all the material in the Bethsaida section that the canonical author has. But did Luke/Marcion also use canonical GMk?