So here’s a little more detail on our foundation. I never thought I would know so much about foundations! Our house is pier and beam and now that we can see all of the foundation I understand how it all goes together. The concrete piers go deep into the ground and are connected by thick wooden beams. There is also a concrete perimeter beam around the outside of the house. The wooded floor joists go on top of the beams to support the subfloor.
Here’s our foundation: 

Yep, that’s what was holding up our dining room floor. Scary