vinyl kitchen floor strata

The kitchen floor was yet another archaeological dig.  The top layer was rolled linoleum.  The tasteful turquoise and sand vinyl tile checkerboard in the picture above is what we thought was the bottom layer.  In between there is at least one layer of vinyl tile, the same as what we've been ripping out of every other room.

Under the checkerboard there's at least one layer of something else (the mottled yellow/brown square in the middle). I'm guessing this is just an underlayer, and the checkerboard is original.

Here's an attempt to get all four (five?) generations together in a family snapshot.