Your ammonite probably is...
Merocanites
Suture: Ceratitic
Merocanites had a smooth shell with no radial ribs, grooves, or ridges. The umbilicus is open. Its suture was a simplistic sharp-edged ceratitic one, but this was rather advanced for Lower Carboniferous (Mississippian) ammonoids. Merocanites lived in fairly deep water.
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