Here is a nice trilobite from the Rochester shale that beleongs to the specues Calymene niagarensis. The plate with about 113 x 84 mm shows also some Bryozoa fossils. | |||
Location: | Middleport, New York, USA | ||
Size trilobite: | about 30 mm long | ||
Age: | Lower Silurian, Rochester shale (about. 430 Mill. y.o.) |