Identify wood type on countertop.

[Helenelund]

Hello
I'm renovating our kitchen and need to replace or possibly extend part of the countertop, but I'm unsure about the type of wood it's made from. Is there a good guide on wood types or does anyone here have any insights? I'm including a picture of the underside of the countertop which is untreated, as well as the end grain.

 

[Oldboy]

Guessing birch or maple.

 

[smurfarfrasse]

Guessing maple or ash. Anti-guessing birch

 

[namnbyte]

I think the end grain looks like birch, but the underside resembles the grayish ash. Are you completely sure it hasn't been treated underneath?