This is the (potentially) third species of Cyrtina that I've collected from Arkona. Cyrtina arkonensis is only known from the Arkona shale and that is where this specimen was collected.
I need to sit down and really investigate the differences between the three species I think I've found: C. arkonensis, C. coultisorum and C. hamiltonensis
I located two identical fossils , 1 1/4 "x 3/4" in Arkona in 1972 on a family trip . Also , located a fossilized clam shell in the Maitland River , in Benmiller 1/4 mile downstream from township bridge same year . It is 1 1/2" x 3/4" x 7/16"
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