[Carl n Susan]

As mlh wrote, Montana uses Corian counters in the 2012 models including the 3700. If you look just to the left of the faucet you should find the "Corian by DuPont" medallion embedded in the counter top. I can't remember when they started using Corian but I am guessing it was with the advent of the Hickory Edition models. Earlier Montanas, like thekenny's 2007, had a fiberglass-like counter top.

We have Corina in the house too and love it. Don't cut or place hot pans on it and you will be fine. Seahunter's link is terrific information if you should scratch the surface.