Mystery Shell Stitch

[Ladybirdyouslyfox]

I started this scarf a long time ago but set it aside before finishing it. Now I can't remember what pattern I was using. Does anybody recognize what type of shell stitch this is?

[Granny Square]

I don't know if it has a name, but since you have the scarf and could poke at it a bit you could probably reconstruct the pattern closer than my attempt.

Some shell patterns are interlocked, some are stacked on top of each other and yours is the second type.  My guess looking at the photo is that the shell is 3 DC, chain (2?), 3 DC.  Between the shells are 2 DC, made into 2 DC in the row below; the shell is made into the chain gap in the middle of the shell below.  There don't appear to be chains between the shells and the 2 DCs between them.