Another Maybeck looking detail uncovered

I have been working on undo-ing some linoleum that was probably added in the '50s and I uncovered what must be the original kitchen floor tile.

Looks like... yes... asbestos! Old grey fibrous and often cementitious type materials are usually asbestos. Here you can see the linoleum looks like that, on top of Masonite, on top of Maybeck-looking (and asbestos-looking) flooring on top of burlap? I would've expected tar paper.

1/4" Masonite underlayment under the linoleum

Yes the original flooring was set on burlap it appears. Probably felt good underfoot, but a recipe for rot in a wet room like the kitchen. 

Back to the suspected Maybeck feature... 

Does the above pattern look familiar? 

Yup.