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Tribolite Tribolite trilobite
Trilobites lived in the Palaeozoic era, between 300 and 500 million years ago.
Jason Craig Canning has written:
'Palaeozoic lamprophyres of the Northern Highlands of Scotland'
J. Frederick N. Green has written:
'The Older Palaeozoic succession of the Duddon Estuary'
William R. Head has written:
'Catalogue of recognized Palaeozoic sponges of North America. 1895'