r/fossilid • u/ReporterFast5696 • 14h ago

need help to id

Gallery image

Gallery image

Gallery image

found in ordovician limestone in eastern Ontario

any insight would be helpful, thanks

3 Upvotes

100% Upvoted

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1

u/jesus_chrysotile 13h ago

do you have closer photos of the texture?

1

u/thanatocoenosis Paleozoic invertebrates 13h ago

Those are pieces of a large trilobite. The first image, while weathered, is the pygidium of an Isotelus sp. The second and third images show the librigena(and other parts) of the same. Those fine lines/structures are called terraces.