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Calymene niagarensis
0171
Calymene niagarensis (HALL)
Silurien
McCook, Illinois (USA)
Width of the cephalon about 1.0 cm
0172
0173
0174
reflecting micro spots of dolomite:
0175
0176
0177
Asaphida
Harpina
Illaenina
Lichida
Phacopina
Proetina
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