At one time, this tree was described from fossils and thought to be extinct. Then, a small stand of trees was found that turned out to be living versions of the fossils. It is the only living species of its genus, but several fossil species are known.
It has needles, but is deciduous. The lower trunk tends to become buttressed as the tree gets older. (hmmmmmm, I wonder if I am related. My middle trunk is becoming buttressed as I get older ;-)
It just dawned on me that you're asking about a tree that I planted over thirty years ago in my back yard in central Ohio. It's now about 4' diameter at the base, but quickly tapers to probably 2' dbh. I'm not a carver, but I played around with a branch making a walking stick, and I believe you carvers out there wood love this wood. It is fine grained,easily carved, and takes detail extremely well.