Thank you all, for the help and diagrams. What I bought was tagged Pork Shoulder, they weigh about 20 lbs, one piece. No skin, nice fat cap on one side. Fairly symmetrical, doesn't look like a picnic.
I cut them just below the bone, hard to tell the split shoulder pieces apart,but I'm not a butcher.
I did take a look at what remained of the roast. I used the area around the bone last night, today I broke down what was left. I saw the 3 "tubes' of meat, one was much more pink then the surrounding meat. I was tasting as I worked my way through. I admit to a less then stellar palate, but, it all tasted good to me.