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GeoRef Subject
Conodonta
Brachiopoda
Anthozoa
Lower Silurian
microfossils
Crinozoa
Echinodermata
Cnidaria
Invertebrata
Arthropoda
Articulata
Mollusca
Paleozoic
Wenlock
Niagaran
Middle Silurian
paleoecology
Llandovery
Trilobitomorpha
Wisconsin
Pentamerida
Bryozoa
Racine Dolomite
United States
Trilobita
Silurian
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