Milling a large walnut tree that Paul Lelito harvested in West Bridgewater, MA. This wood is for sale. See Paul's contact information at the end of the video.
Steve Branam: Bowl-cut means that when they cut the base at the ground line, they actually ran the end of the chain saw down below ground level, plunging it in from the sides. That cuts a "bowl" in the ground and doesn't leave an above-ground stump, harvesting the maximum possible wood at the base.
You can see that in the rounded end. Also in the photos in my west-bridgewater-walnut post on my blog CloseGrain dot com. I assume that's a pretty risky procedure, you have to be careful to check for rocks etc. so you can be sure the saw won't hit anything.