The wood used in this table came from a 100+ year old barn that was torn down in La Salle, CO. It is a very tight grained doug fir. The Lumber for the top was planed smooth, assembled, and hand planed to create a smooth, flat table. The wood is very splinter prone, but a heavy coat of danish oil and wax on the top create a layer of protection.
To give you an idea of the grain on this wood, I counted growth rings on one quarter sawn 2×6 board and came up with over 125 years in this one piece alone.