Honestly I've been meaning to stop by that guy's place and ask him if the tree ever dropped massive stones because in every other way it looks like a mahogany.
I didn't see the Samara or any other debris, but I want really looking for it. I'm convinced it was an ash tree. The leaf pictures in the link you sent look pretty close.
I think you might be right. It definitely sounds like some kind of ash. There are a few with entire margins, too, which this one has. Nice work! Thanks for the help.
Sorry just catching up on all the replies. Lots of good advice, here, so I'll just say thanks to all who replied.
I'm not proud I couldn't identify the tree, but I'm actively working on tree id skills. I would have felt a bit worse if I'd posted this and a dozen people popped up and said, "It's...
Hey, Tim, happy to share. I'm just starting out, and trying to build some goodwill and get some good word of mouth. I'm not hurting for money at the moment because I'm still teaching full time (hoping to transition to business owner or contract climber before August so I don't have to go back to...