@greg-kessinger Canadian pebble is probable. The material on the surface would not have survived the glacial action that rounded the pebble. My thought is that this is a post glacial mineralogic creation, perhaps caliche?
From my own experience, I have a small pebble that I found as a kid that was split in two with both sides together. It is red sandstone (?) and inside is the impression of a Devonian brachiopod. So this one made it from Canada to Dayton, Ohio.
The other improbable specimen was found by a fellow Dry Dredger here in Cincinnati. This was a small slab with a complete well preserved Devonian Phacops trilobite from the Toledo, Ohio area. How that survived is unimaginable.