Identifying Slot on Motherboard

I am trying to identify what type of slot this is. I think it is either a M.2 or mSATA, but I do not know for sure as the motherboard does not explicitly tell me what it is. The only text next to is is Type C. Two mounting holes are present on either side of the slot, and the slot appears to have many pins. I have also a picture for reference. I have identified other M.2 ports on this board, and they all have text that references M.2, and I am assuming that if this was a mSATA slot, it would explicitly tell me.

Here is the link to the motherboard data sheet, it appears that this slot is not even listed on the diagram. Any help is greatly appreciated, thank you!