Found it at the edge of a swamp. It was one large “mass” weighing about 50 lbs. got it back to the shop and etched it down, starting with vinegar. That allowed me to Dremel to a certain depth until the matrix began dulling all my bits. Submerged it in diluted muriatic acid - nothing. Submerged it in about 80:20 muriatic acid and it started showing me what’s in the photos. It’s back on the bench now where I’ll see if I can chip away the surrounded matrix then, it’s back to the acid. #fossil