Nokta FoRs Gold, a Gold Cube, 2 Keene Sluices and Lord only knows how many pans....not to mention a load of other gear my wife still doesn't know about!
Dinosaur coprolite is a rare find and as far as I have been able to research, no such specimens have ever been found in Illinois.
Take to a university paleontology department to have a positive ID.
Some interesting youtube videos tell the dino tale; glaciers scraped off that layer, but there are a few tiny points in the state where dino remains have been found. Not in the location I found htis, though.
There were no dinosaurs (anywhere) in the Carboniferous/Pennsylvanian. That would be at least 50 million years too early. Dinosaurs didn't begin appearing until the Triassic, no more than 250 million years ago, and the earliest forms were small bipedal creatures no more than two meters long, including the tail.
It doesn’t really look like a coprolite. If it is a fossil, it’s probably a sort of fossilized coral or sponge. However, it’s most likely just a weathered rock.