That's Connecticut bluestone with red brick trim, installed on a concrete slab, with mortared joints.

Hello, What is the base for vertical columns? Is it concrete? Also how deep?

K. c. , the columns are bolted into concrete bases (footings) using metal post brackets from Simpson Strong-Tie. I believe these footings are 18" diameter by 24" deep, but you should have a licensed contractor, engineer or architect specify footings based on your particular structure, soil, etc.

OK, so the wider 'base' at the bottom of the posts is just boxed around the 8x8? and the actual post goes deeper correct? Thank you.

K.c., you're half correct. The wider base (or "boot") is built around the main 8x8 post. However, in this case, the post itself is not embedded below ground: the Simpson bracket holds it just above ground to allow water to drain away. Some contractors will set posts directly into the footing concrete, but in my opinion using a bracket is better in structural applications like this.