The difference between fossiliferous limestone/chert is that it forms in beds/layers in limestone, and hornstone which forms in nodulesSounds like glass/flint creek in Harrison/Crawford forest....that whole creek bank is nothing but nodules of Indiana hornstone going up 30 plus feet with narrow trails to get you to them...it's a dry branch (that leads to the boat ramp on the river) and if you walked barefoot in it for 5 yards your feet would be in shreds.....if every flake is an artifact, and I am told they are, then Harrison/Crawford is the only state land where you can follow the designated trail to the dry branch on your hike and literally destroy artifacts with every step you take on your way down to the river and not get in any trouble....there must've been hundreds of people working it per day and taking nodules down to the river landing for trade.....