These fossils are fairly common around the Cumberland Plateau of the southern U.S. This photo spans about 2 inches across. If you look closely, you’ll see almost everything in the photo is a fossil!
I'm from Huntsville, Alabama where I work as a Software Engineer and part-time banjo instructor. My wife Miiko and I worship at Rivertree Downtown.
I've been playing various instruments since my teen years. I started mandolin and dulcimer at about age 17 and banjo at 20. I love just about all kinds of music. In terms of banjo styles, I play and teach Scruggs, melodic, clawhammer, and 2-finger styles.
I'm also very keen on theology, being a Trail Care Partner with the Land Trust of North Alabama, photography, urban planning, architecture, astronomy, ATM (amateur telescope making), birding, martial arts, and about 30 other distracting hobbies to a (mercifully) lesser extent.
Thanks!
If you’re ever in Huntsville, Al, you can find that particular rock (with lots more fossils than what was shown) in the Hays Nature Preserve: https://www.google.com/maps/@34.6430423,-86.4658256,20.5z?hl=en at the SE corner of the walkway bridge and the river!
Phill Gibson 
Really like this capture of the Paleozoic fossils.
Thanks!
If you’re ever in Huntsville, Al, you can find that particular rock (with lots more fossils than what was shown) in the Hays Nature Preserve:
https://www.google.com/maps/@34.6430423,-86.4658256,20.5z?hl=en at the SE corner of the walkway bridge and the river!