Any idea what wood this is?

Years ago when I was first starting out with woodworking I grabbed a random spacer block at work. Cut it up and glued it to make a bowl blank. It felt too small so I chucked it in a bin and forgot about it. Started making bandsaw boxes and figured hey this would work for practice. Back then I assumed it was oak, now having more experience it's at least not a species of oak Im familiar with. That is, red or live oak. I Maybe elm? Not sure. It's dense and hard.